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865
js/Canvas.js
Normal file
865
js/Canvas.js
Normal file
@@ -0,0 +1,865 @@
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export class Canvas {
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constructor(node, widget) {
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this.node = node;
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this.widget = widget;
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this.canvas = document.createElement('canvas');
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this.ctx = this.canvas.getContext('2d');
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this.width = 512;
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this.height = 512;
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this.layers = [];
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this.selectedLayer = null;
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this.isRotating = false;
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this.rotationStartAngle = 0;
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this.rotationCenter = { x: 0, y: 0 };
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this.selectedLayers = [];
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this.isCtrlPressed = false;
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this.offscreenCanvas = document.createElement('canvas');
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this.offscreenCtx = this.offscreenCanvas.getContext('2d', {
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alpha: false
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});
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this.gridCache = document.createElement('canvas');
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this.gridCacheCtx = this.gridCache.getContext('2d', {
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alpha: false
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});
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this.renderAnimationFrame = null;
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this.lastRenderTime = 0;
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this.renderInterval = 1000 / 60;
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this.isDirty = false;
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this.initCanvas();
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this.setupEventListeners();
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}
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initCanvas() {
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this.canvas.width = this.width;
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this.canvas.height = this.height;
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this.canvas.style.border = '1px solid black';
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this.canvas.style.maxWidth = '100%';
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this.canvas.style.backgroundColor = '#606060';
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}
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setupEventListeners() {
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let isDragging = false;
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let lastX = 0;
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let lastY = 0;
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let isRotating = false;
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let isResizing = false;
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let resizeHandle = null;
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let lastClickTime = 0;
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document.addEventListener('keydown', (e) => {
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if (e.key === 'Control') {
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this.isCtrlPressed = true;
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}
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});
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document.addEventListener('keyup', (e) => {
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if (e.key === 'Control') {
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this.isCtrlPressed = false;
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}
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});
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this.canvas.addEventListener('mousedown', (e) => {
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const currentTime = new Date().getTime();
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const rect = this.canvas.getBoundingClientRect();
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const mouseX = e.clientX - rect.left;
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const mouseY = e.clientY - rect.top;
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if (currentTime - lastClickTime < 300) {
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this.selectedLayers = [];
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this.selectedLayer = null;
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this.render();
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return;
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}
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lastClickTime = currentTime;
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const result = this.getLayerAtPosition(mouseX, mouseY);
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if (result) {
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const clickedLayer = result.layer;
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if (this.isCtrlPressed) {
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const index = this.selectedLayers.indexOf(clickedLayer);
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if (index === -1) {
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this.selectedLayers.push(clickedLayer);
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this.selectedLayer = clickedLayer;
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} else {
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this.selectedLayers.splice(index, 1);
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this.selectedLayer = this.selectedLayers[this.selectedLayers.length - 1] || null;
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}
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} else {
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if (!this.selectedLayers.includes(clickedLayer)) {
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this.selectedLayers = [clickedLayer];
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this.selectedLayer = clickedLayer;
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}
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}
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if (this.isRotationHandle(mouseX, mouseY)) {
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isRotating = true;
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this.rotationCenter.x = this.selectedLayer.x + this.selectedLayer.width/2;
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this.rotationCenter.y = this.selectedLayer.y + this.selectedLayer.height/2;
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this.rotationStartAngle = Math.atan2(
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mouseY - this.rotationCenter.y,
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mouseX - this.rotationCenter.x
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);
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} else {
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isDragging = true;
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lastX = mouseX;
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lastY = mouseY;
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}
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} else {
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if (!this.isCtrlPressed) {
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this.selectedLayers = [];
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this.selectedLayer = null;
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}
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}
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this.render();
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});
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this.canvas.addEventListener('mousemove', (e) => {
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if (!this.selectedLayer) return;
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const rect = this.canvas.getBoundingClientRect();
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const mouseX = e.clientX - rect.left;
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const mouseY = e.clientY - rect.top;
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if (isResizing && resizeHandle) {
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const dx = mouseX - lastX;
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const dy = mouseY - lastY;
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this.selectedLayers.forEach(layer => {
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const originalWidth = layer.width;
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const originalHeight = layer.height;
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const originalX = layer.x;
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const originalY = layer.y;
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switch(resizeHandle) {
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case 'nw':
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layer.width = Math.max(20, originalWidth - dx);
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layer.height = Math.max(20, originalHeight - dy);
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layer.x = originalX + (originalWidth - layer.width);
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layer.y = originalY + (originalHeight - layer.height);
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break;
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case 'ne':
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layer.width = Math.max(20, originalWidth + dx);
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layer.height = Math.max(20, originalHeight - dy);
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layer.y = originalY + (originalHeight - layer.height);
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break;
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case 'se':
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layer.width = Math.max(20, originalWidth + dx);
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layer.height = Math.max(20, originalHeight + dy);
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break;
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case 'sw':
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layer.width = Math.max(20, originalWidth - dx);
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layer.height = Math.max(20, originalHeight + dy);
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layer.x = originalX + (originalWidth - layer.width);
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break;
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}
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});
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lastX = mouseX;
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lastY = mouseY;
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this.render();
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} else if (isRotating) {
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const currentAngle = Math.atan2(
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mouseY - this.rotationCenter.y,
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mouseX - this.rotationCenter.x
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);
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let rotation = (currentAngle - this.rotationStartAngle) * (180/Math.PI);
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const snap = 15;
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rotation = Math.round(rotation / snap) * snap;
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this.selectedLayers.forEach(layer => {
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layer.rotation = rotation;
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});
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this.render();
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} else if (isDragging) {
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const dx = mouseX - lastX;
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const dy = mouseY - lastY;
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this.selectedLayers.forEach(layer => {
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layer.x += dx;
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layer.y += dy;
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});
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lastX = mouseX;
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lastY = mouseY;
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this.render();
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}
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const cursor = this.getResizeHandle(mouseX, mouseY)
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? 'nw-resize'
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: this.isRotationHandle(mouseX, mouseY)
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? 'grab'
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: isDragging ? 'move' : 'default';
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this.canvas.style.cursor = cursor;
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});
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this.canvas.addEventListener('mouseup', () => {
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isDragging = false;
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isRotating = false;
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});
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this.canvas.addEventListener('mouseleave', () => {
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isDragging = false;
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isRotating = false;
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});
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// 添加鼠标滚轮缩放功能
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this.canvas.addEventListener('wheel', (e) => {
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if (!this.selectedLayer) return;
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e.preventDefault();
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const scaleFactor = e.deltaY > 0 ? 0.95 : 1.05;
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// 如果按住Shift键，则进行旋转而不是缩放
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if (e.shiftKey) {
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const rotateAngle = e.deltaY > 0 ? -5 : 5;
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this.selectedLayers.forEach(layer => {
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layer.rotation = (layer.rotation + rotateAngle) % 360;
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});
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} else {
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// 从鼠标位置为中心进行缩放
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const rect = this.canvas.getBoundingClientRect();
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const mouseX = e.clientX - rect.left;
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const mouseY = e.clientY - rect.top;
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this.selectedLayers.forEach(layer => {
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const centerX = layer.x + layer.width/2;
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const centerY = layer.y + layer.height/2;
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// 计算鼠标相对于图层中心的位置
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const relativeX = mouseX - centerX;
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const relativeY = mouseY - centerY;
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// 更新尺寸
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const oldWidth = layer.width;
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const oldHeight = layer.height;
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layer.width *= scaleFactor;
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layer.height *= scaleFactor;
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// 调整位置以保持鼠标指向的点不变
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layer.x += (oldWidth - layer.width) / 2;
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layer.y += (oldHeight - layer.height) / 2;
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});
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}
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this.render();
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});
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// 优化旋转控制逻辑
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let initialRotation = 0;
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let initialAngle = 0;
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this.canvas.addEventListener('mousemove', (e) => {
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// ... 其他代码保持不变 ...
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if (isRotating) {
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const rect = this.canvas.getBoundingClientRect();
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const mouseX = e.clientX - rect.left;
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const mouseY = e.clientY - rect.top;
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const centerX = this.selectedLayer.x + this.selectedLayer.width/2;
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const centerY = this.selectedLayer.y + this.selectedLayer.height/2;
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// 计算当前角度
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const angle = Math.atan2(mouseY - centerY, mouseX - centerX) * 180 / Math.PI;
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if (e.shiftKey) {
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// 按住Shift键时启用15度角度吸附
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const snap = 15;
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const rotation = Math.round((angle - initialAngle + initialRotation) / snap) * snap;
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this.selectedLayers.forEach(layer => {
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layer.rotation = rotation;
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});
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} else {
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// 正常旋转
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const rotation = angle - initialAngle + initialRotation;
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this.selectedLayers.forEach(layer => {
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layer.rotation = rotation;
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});
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}
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this.render();
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}
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});
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this.canvas.addEventListener('mousedown', (e) => {
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// ... 其他代码保持不变 ...
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if (this.isRotationHandle(mouseX, mouseY)) {
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isRotating = true;
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const centerX = this.selectedLayer.x + this.selectedLayer.width/2;
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const centerY = this.selectedLayer.y + this.selectedLayer.height/2;
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initialRotation = this.selectedLayer.rotation;
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initialAngle = Math.atan2(mouseY - centerY, mouseX - centerX) * 180 / Math.PI;
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}
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});
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// 添加键盘快捷键
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document.addEventListener('keydown', (e) => {
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if (!this.selectedLayer) return;
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const step = e.shiftKey ? 1 : 5; // Shift键按下时更精细的控制
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switch(e.key) {
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case 'ArrowLeft':
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this.selectedLayers.forEach(layer => layer.x -= step);
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break;
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case 'ArrowRight':
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this.selectedLayers.forEach(layer => layer.x += step);
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break;
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case 'ArrowUp':
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this.selectedLayers.forEach(layer => layer.y -= step);
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break;
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case 'ArrowDown':
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this.selectedLayers.forEach(layer => layer.y += step);
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break;
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case '[':
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this.selectedLayers.forEach(layer => layer.rotation -= step);
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break;
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case ']':
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this.selectedLayers.forEach(layer => layer.rotation += step);
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break;
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}
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if (['ArrowLeft', 'ArrowRight', 'ArrowUp', 'ArrowDown', '[', ']'].includes(e.key)) {
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e.preventDefault();
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this.render();
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}
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});
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}
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isRotationHandle(x, y) {
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if (!this.selectedLayer) return false;
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const handleX = this.selectedLayer.x + this.selectedLayer.width/2;
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const handleY = this.selectedLayer.y - 20;
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const handleRadius = 5;
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return Math.sqrt(Math.pow(x - handleX, 2) + Math.pow(y - handleY, 2)) <= handleRadius;
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}
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addLayer(image) {
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const layer = {
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image: image,
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x: 0,
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y: 0,
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width: image.width,
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height: image.height,
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rotation: 0,
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zIndex: this.layers.length
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};
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this.layers.push(layer);
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this.selectedLayer = layer;
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this.render();
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}
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removeLayer(index) {
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if (index >= 0 && index < this.layers.length) {
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this.layers.splice(index, 1);
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this.selectedLayer = this.layers[this.layers.length - 1] || null;
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this.render();
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}
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}
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moveLayer(fromIndex, toIndex) {
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if (fromIndex >= 0 && fromIndex < this.layers.length &&
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toIndex >= 0 && toIndex < this.layers.length) {
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const layer = this.layers.splice(fromIndex, 1)[0];
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this.layers.splice(toIndex, 0, layer);
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this.render();
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}
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}
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resizeLayer(scale) {
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this.selectedLayers.forEach(layer => {
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layer.width *= scale;
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layer.height *= scale;
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});
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this.render();
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}
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rotateLayer(angle) {
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this.selectedLayers.forEach(layer => {
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layer.rotation += angle;
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});
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this.render();
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}
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updateCanvasSize(width, height) {
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this.width = width;
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this.height = height;
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this.canvas.width = width;
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this.canvas.height = height;
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// 调整所有图层的位置和大小
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this.layers.forEach(layer => {
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const scale = Math.min(
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width / layer.image.width * 0.8,
|
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height / layer.image.height * 0.8
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);
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layer.width = layer.image.width * scale;
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layer.height = layer.image.height * scale;
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layer.x = (width - layer.width) / 2;
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layer.y = (height - layer.height) / 2;
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});
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this.render();
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}
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render() {
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if (this.renderAnimationFrame) {
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this.isDirty = true;
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return;
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||||
}
|
||||
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this.renderAnimationFrame = requestAnimationFrame(() => {
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const now = performance.now();
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if (now - this.lastRenderTime >= this.renderInterval) {
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this.lastRenderTime = now;
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this.actualRender();
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this.isDirty = false;
|
||||
}
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|
||||
if (this.isDirty) {
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||||
this.renderAnimationFrame = null;
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||||
this.render();
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} else {
|
||||
this.renderAnimationFrame = null;
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||||
}
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||||
});
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||||
}
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||||
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actualRender() {
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if (this.offscreenCanvas.width !== this.width ||
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this.offscreenCanvas.height !== this.height) {
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||||
this.offscreenCanvas.width = this.width;
|
||||
this.offscreenCanvas.height = this.height;
|
||||
}
|
||||
|
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const ctx = this.offscreenCtx;
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ctx.fillStyle = '#606060';
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ctx.fillRect(0, 0, this.width, this.height);
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this.drawCachedGrid();
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const sortedLayers = [...this.layers].sort((a, b) => a.zIndex - b.zIndex);
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||||
|
||||
sortedLayers.forEach(layer => {
|
||||
if (!layer.image || layer.width <= 0 || layer.height <= 0) return;
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||||
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ctx.save();
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||||
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const centerX = layer.x + layer.width/2;
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const centerY = layer.y + layer.height/2;
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const rad = layer.rotation * Math.PI / 180;
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||||
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ctx.setTransform(
|
||||
Math.cos(rad), Math.sin(rad),
|
||||
-Math.sin(rad), Math.cos(rad),
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||||
centerX, centerY
|
||||
);
|
||||
|
||||
ctx.imageSmoothingEnabled = true;
|
||||
ctx.imageSmoothingQuality = 'high';
|
||||
|
||||
ctx.drawImage(
|
||||
layer.image,
|
||||
-layer.width/2,
|
||||
-layer.height/2,
|
||||
layer.width,
|
||||
layer.height
|
||||
);
|
||||
|
||||
if (this.selectedLayers.includes(layer)) {
|
||||
this.drawSelectionFrame(layer);
|
||||
}
|
||||
|
||||
ctx.restore();
|
||||
});
|
||||
|
||||
this.ctx.drawImage(this.offscreenCanvas, 0, 0);
|
||||
}
|
||||
|
||||
drawCachedGrid() {
|
||||
if (this.gridCache.width !== this.width ||
|
||||
this.gridCache.height !== this.height) {
|
||||
this.gridCache.width = this.width;
|
||||
this.gridCache.height = this.height;
|
||||
|
||||
const ctx = this.gridCacheCtx;
|
||||
const gridSize = 20;
|
||||
|
||||
ctx.beginPath();
|
||||
ctx.strokeStyle = '#e0e0e0';
|
||||
ctx.lineWidth = 0.5;
|
||||
|
||||
for(let y = 0; y < this.height; y += gridSize) {
|
||||
ctx.moveTo(0, y);
|
||||
ctx.lineTo(this.width, y);
|
||||
}
|
||||
|
||||
for(let x = 0; x < this.width; x += gridSize) {
|
||||
ctx.moveTo(x, 0);
|
||||
ctx.lineTo(x, this.height);
|
||||
}
|
||||
|
||||
ctx.stroke();
|
||||
}
|
||||
|
||||
this.offscreenCtx.drawImage(this.gridCache, 0, 0);
|
||||
}
|
||||
|
||||
drawSelectionFrame(layer) {
|
||||
const ctx = this.offscreenCtx;
|
||||
|
||||
ctx.beginPath();
|
||||
|
||||
ctx.rect(-layer.width/2, -layer.height/2, layer.width, layer.height);
|
||||
|
||||
ctx.moveTo(0, -layer.height/2);
|
||||
ctx.lineTo(0, -layer.height/2 - 20);
|
||||
|
||||
ctx.strokeStyle = '#00ff00';
|
||||
ctx.lineWidth = 2;
|
||||
ctx.stroke();
|
||||
|
||||
ctx.beginPath();
|
||||
|
||||
const points = [
|
||||
{x: 0, y: -layer.height/2 - 20},
|
||||
{x: -layer.width/2, y: -layer.height/2},
|
||||
{x: layer.width/2, y: -layer.height/2},
|
||||
{x: layer.width/2, y: layer.height/2},
|
||||
{x: -layer.width/2, y: layer.height/2}
|
||||
];
|
||||
|
||||
points.forEach(point => {
|
||||
ctx.moveTo(point.x, point.y);
|
||||
ctx.arc(point.x, point.y, 5, 0, Math.PI * 2);
|
||||
});
|
||||
|
||||
ctx.fillStyle = '#ffffff';
|
||||
ctx.fill();
|
||||
ctx.stroke();
|
||||
}
|
||||
|
||||
async saveToServer(fileName) {
|
||||
return new Promise((resolve) => {
|
||||
// 创建临时画布
|
||||
const tempCanvas = document.createElement('canvas');
|
||||
const maskCanvas = document.createElement('canvas');
|
||||
tempCanvas.width = this.width;
|
||||
tempCanvas.height = this.height;
|
||||
maskCanvas.width = this.width;
|
||||
maskCanvas.height = this.height;
|
||||
|
||||
const tempCtx = tempCanvas.getContext('2d');
|
||||
const maskCtx = maskCanvas.getContext('2d');
|
||||
|
||||
// 填充白色背景
|
||||
tempCtx.fillStyle = '#ffffff';
|
||||
tempCtx.fillRect(0, 0, this.width, this.height);
|
||||
|
||||
// 填充黑色背景作为遮罩的基础（表示完全透明）
|
||||
maskCtx.fillStyle = '#000000';
|
||||
maskCtx.fillRect(0, 0, this.width, this.height);
|
||||
|
||||
// 绘制所有图层
|
||||
this.layers.sort((a, b) => a.zIndex - b.zIndex).forEach(layer => {
|
||||
// 绘制主图像
|
||||
tempCtx.save();
|
||||
tempCtx.translate(layer.x + layer.width/2, layer.y + layer.height/2);
|
||||
tempCtx.rotate(layer.rotation * Math.PI / 180);
|
||||
|
||||
// 创建临时画布来处理透明度
|
||||
const layerCanvas = document.createElement('canvas');
|
||||
layerCanvas.width = layer.width;
|
||||
layerCanvas.height = layer.height;
|
||||
const layerCtx = layerCanvas.getContext('2d');
|
||||
|
||||
// 绘制图层到临时画布
|
||||
layerCtx.drawImage(
|
||||
layer.image,
|
||||
0,
|
||||
0,
|
||||
layer.width,
|
||||
layer.height
|
||||
);
|
||||
|
||||
// 获取图层的像素数据
|
||||
const imageData = layerCtx.getImageData(0, 0, layer.width, layer.height);
|
||||
const data = imageData.data;
|
||||
|
||||
// 创建遮罩数据
|
||||
const maskImageData = new ImageData(layer.width, layer.height);
|
||||
const maskData = maskImageData.data;
|
||||
|
||||
// 处理每个像素的透明度
|
||||
for (let i = 0; i < data.length; i += 4) {
|
||||
const alpha = data[i + 3] / 255; // 获取原始alpha值
|
||||
|
||||
// 设置遮罩像素值（白色表示不透明区域）
|
||||
maskData[i] = maskData[i + 1] = maskData[i + 2] = 255 * alpha;
|
||||
maskData[i + 3] = 255; // 遮罩本身始终不透明
|
||||
}
|
||||
|
||||
// 将处理后的图层绘制到主画布
|
||||
tempCtx.drawImage(layerCanvas, -layer.width/2, -layer.height/2);
|
||||
|
||||
// 绘制遮罩
|
||||
maskCtx.save();
|
||||
maskCtx.translate(layer.x + layer.width/2, layer.y + layer.height/2);
|
||||
maskCtx.rotate(layer.rotation * Math.PI / 180);
|
||||
|
||||
// 创建临时遮罩画布
|
||||
const tempMaskCanvas = document.createElement('canvas');
|
||||
tempMaskCanvas.width = layer.width;
|
||||
tempMaskCanvas.height = layer.height;
|
||||
const tempMaskCtx = tempMaskCanvas.getContext('2d');
|
||||
|
||||
// 将遮罩数据绘制到临时画布
|
||||
tempMaskCtx.putImageData(maskImageData, 0, 0);
|
||||
|
||||
// 使用lighter混合模式来叠加透明度
|
||||
maskCtx.globalCompositeOperation = 'lighter';
|
||||
maskCtx.drawImage(tempMaskCanvas, -layer.width/2, -layer.height/2);
|
||||
|
||||
maskCtx.restore();
|
||||
tempCtx.restore();
|
||||
});
|
||||
|
||||
// 在保存遮罩之前反转遮罩数据
|
||||
const maskData = maskCtx.getImageData(0, 0, this.width, this.height);
|
||||
const data = maskData.data;
|
||||
for (let i = 0; i < data.length; i += 4) {
|
||||
// 反转RGB值（255 - 原值）
|
||||
data[i] = data[i + 1] = data[i + 2] = 255 - data[i];
|
||||
data[i + 3] = 255; // Alpha保持不变
|
||||
}
|
||||
maskCtx.putImageData(maskData, 0, 0);
|
||||
|
||||
// 保存主图像和遮罩
|
||||
tempCanvas.toBlob(async (blob) => {
|
||||
const formData = new FormData();
|
||||
formData.append("image", blob, fileName);
|
||||
formData.append("overwrite", "true");
|
||||
|
||||
try {
|
||||
const resp = await fetch("/upload/image", {
|
||||
method: "POST",
|
||||
body: formData,
|
||||
});
|
||||
|
||||
if (resp.status === 200) {
|
||||
// 保存遮罩图像
|
||||
maskCanvas.toBlob(async (maskBlob) => {
|
||||
const maskFormData = new FormData();
|
||||
const maskFileName = fileName.replace('.png', '_mask.png');
|
||||
maskFormData.append("image", maskBlob, maskFileName);
|
||||
maskFormData.append("overwrite", "true");
|
||||
|
||||
try {
|
||||
const maskResp = await fetch("/upload/image", {
|
||||
method: "POST",
|
||||
body: maskFormData,
|
||||
});
|
||||
|
||||
if (maskResp.status === 200) {
|
||||
const data = await resp.json();
|
||||
this.widget.value = data.name;
|
||||
resolve(true);
|
||||
} else {
|
||||
console.error("Error saving mask: " + maskResp.status);
|
||||
resolve(false);
|
||||
}
|
||||
} catch (error) {
|
||||
console.error("Error saving mask:", error);
|
||||
resolve(false);
|
||||
}
|
||||
}, "image/png");
|
||||
} else {
|
||||
console.error(resp.status + " - " + resp.statusText);
|
||||
resolve(false);
|
||||
}
|
||||
} catch (error) {
|
||||
console.error(error);
|
||||
resolve(false);
|
||||
}
|
||||
}, "image/png");
|
||||
});
|
||||
}
|
||||
|
||||
moveLayerUp() {
|
||||
if (!this.selectedLayer) return;
|
||||
const index = this.layers.indexOf(this.selectedLayer);
|
||||
if (index < this.layers.length - 1) {
|
||||
const temp = this.layers[index].zIndex;
|
||||
this.layers[index].zIndex = this.layers[index + 1].zIndex;
|
||||
this.layers[index + 1].zIndex = temp;
|
||||
[this.layers[index], this.layers[index + 1]] = [this.layers[index + 1], this.layers[index]];
|
||||
this.render();
|
||||
}
|
||||
}
|
||||
|
||||
moveLayerDown() {
|
||||
if (!this.selectedLayer) return;
|
||||
const index = this.layers.indexOf(this.selectedLayer);
|
||||
if (index > 0) {
|
||||
const temp = this.layers[index].zIndex;
|
||||
this.layers[index].zIndex = this.layers[index - 1].zIndex;
|
||||
this.layers[index - 1].zIndex = temp;
|
||||
[this.layers[index], this.layers[index - 1]] = [this.layers[index - 1], this.layers[index]];
|
||||
this.render();
|
||||
}
|
||||
}
|
||||
|
||||
getLayerAtPosition(x, y) {
|
||||
// 获取画布的实际显示尺寸和位置
|
||||
const rect = this.canvas.getBoundingClientRect();
|
||||
|
||||
// 计算画布的缩放比例
|
||||
const displayWidth = rect.width;
|
||||
const displayHeight = rect.height;
|
||||
const scaleX = this.width / displayWidth;
|
||||
const scaleY = this.height / displayHeight;
|
||||
|
||||
// 计算鼠标在画布上的实际位置
|
||||
const canvasX = (x) * scaleX;
|
||||
const canvasY = (y) * scaleY;
|
||||
|
||||
// 从上层到下层遍历所有图层
|
||||
for (let i = this.layers.length - 1; i >= 0; i--) {
|
||||
const layer = this.layers[i];
|
||||
|
||||
// 计算旋转后的点击位置
|
||||
const centerX = layer.x + layer.width/2;
|
||||
const centerY = layer.y + layer.height/2;
|
||||
const rad = -layer.rotation * Math.PI / 180;
|
||||
|
||||
// 将点击坐标转换到图层的本地坐标系
|
||||
const dx = canvasX - centerX;
|
||||
const dy = canvasY - centerY;
|
||||
const rotatedX = dx * Math.cos(rad) - dy * Math.sin(rad) + centerX;
|
||||
const rotatedY = dx * Math.sin(rad) + dy * Math.cos(rad) + centerY;
|
||||
|
||||
// 检查点击位置是否在图层范围内
|
||||
if (rotatedX >= layer.x &&
|
||||
rotatedX <= layer.x + layer.width &&
|
||||
rotatedY >= layer.y &&
|
||||
rotatedY <= layer.y + layer.height) {
|
||||
|
||||
// 创建临时画布来检查透明度
|
||||
const tempCanvas = document.createElement('canvas');
|
||||
const tempCtx = tempCanvas.getContext('2d');
|
||||
tempCanvas.width = layer.width;
|
||||
tempCanvas.height = layer.height;
|
||||
|
||||
// 绘制图层到临时画布
|
||||
tempCtx.save();
|
||||
tempCtx.clearRect(0, 0, layer.width, layer.height);
|
||||
tempCtx.drawImage(
|
||||
layer.image,
|
||||
0,
|
||||
0,
|
||||
layer.width,
|
||||
layer.height
|
||||
);
|
||||
tempCtx.restore();
|
||||
|
||||
// 获取点击位置的像素数据
|
||||
const localX = rotatedX - layer.x;
|
||||
const localY = rotatedY - layer.y;
|
||||
|
||||
try {
|
||||
const pixel = tempCtx.getImageData(
|
||||
Math.round(localX),
|
||||
Math.round(localY),
|
||||
1, 1
|
||||
).data;
|
||||
// 检查像素的alpha值
|
||||
if (pixel[3] > 10) {
|
||||
return {
|
||||
layer: layer,
|
||||
localX: localX,
|
||||
localY: localY
|
||||
};
|
||||
}
|
||||
} catch(e) {
|
||||
console.error("Error checking pixel transparency:", e);
|
||||
}
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
getResizeHandle(x, y) {
|
||||
if (!this.selectedLayer) return null;
|
||||
|
||||
const handleRadius = 5;
|
||||
const handles = {
|
||||
'nw': {x: this.selectedLayer.x, y: this.selectedLayer.y},
|
||||
'ne': {x: this.selectedLayer.x + this.selectedLayer.width, y: this.selectedLayer.y},
|
||||
'se': {x: this.selectedLayer.x + this.selectedLayer.width, y: this.selectedLayer.y + this.selectedLayer.height},
|
||||
'sw': {x: this.selectedLayer.x, y: this.selectedLayer.y + this.selectedLayer.height}
|
||||
};
|
||||
|
||||
for (const [position, point] of Object.entries(handles)) {
|
||||
if (Math.sqrt(Math.pow(x - point.x, 2) + Math.pow(y - point.y, 2)) <= handleRadius) {
|
||||
return position;
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
// 修改水平镜像方法
|
||||
mirrorHorizontal() {
|
||||
if (!this.selectedLayer) return;
|
||||
|
||||
// 创建临时画布
|
||||
const tempCanvas = document.createElement('canvas');
|
||||
const tempCtx = tempCanvas.getContext('2d');
|
||||
tempCanvas.width = this.selectedLayer.image.width;
|
||||
tempCanvas.height = this.selectedLayer.image.height;
|
||||
|
||||
// 水平翻转绘制
|
||||
tempCtx.translate(tempCanvas.width, 0);
|
||||
tempCtx.scale(-1, 1);
|
||||
tempCtx.drawImage(this.selectedLayer.image, 0, 0);
|
||||
|
||||
// 创建新图像
|
||||
const newImage = new Image();
|
||||
newImage.onload = () => {
|
||||
this.selectedLayer.image = newImage;
|
||||
this.render();
|
||||
};
|
||||
newImage.src = tempCanvas.toDataURL();
|
||||
}
|
||||
|
||||
// 修改垂直镜像方法
|
||||
mirrorVertical() {
|
||||
if (!this.selectedLayer) return;
|
||||
|
||||
// 创建临时画布
|
||||
const tempCanvas = document.createElement('canvas');
|
||||
const tempCtx = tempCanvas.getContext('2d');
|
||||
tempCanvas.width = this.selectedLayer.image.width;
|
||||
tempCanvas.height = this.selectedLayer.image.height;
|
||||
|
||||
// 垂直翻转绘制
|
||||
tempCtx.translate(0, tempCanvas.height);
|
||||
tempCtx.scale(1, -1);
|
||||
tempCtx.drawImage(this.selectedLayer.image, 0, 0);
|
||||
|
||||
// 创建新图像
|
||||
const newImage = new Image();
|
||||
newImage.onload = () => {
|
||||
this.selectedLayer.image = newImage;
|
||||
this.render();
|
||||
};
|
||||
newImage.src = tempCanvas.toDataURL();
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user