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Refactor text rendering and adjust viewport defaults

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Introduced a drawTextWithBackground helper to centralize and simplify text rendering with backgrounds in CanvasRenderer (JS/TS). Updated all relevant usages to use this helper. Adjusted initial viewport x/y offsets in Canvas and Canvas.ts for improved default positioning.
This commit is contained in:
Dariusz L
2025-07-28 02:50:01 +02:00
parent 5e9869f827
commit bb687a768b
4 changed files with 114 additions and 139 deletions
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4
src/Canvas.ts
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@@ -108,8 +108,8 @@ export class Canvas {
this.lastMousePosition = {x: 0, y: 0};
this.viewport = {
x: -(this.width / 4),
y: -(this.height / 4),
x: -(this.width / 1.5),
y: -(this.height / 2),
zoom: 0.8,
};

134
src/CanvasRenderer.ts
View File

@@ -16,6 +16,49 @@ export class CanvasRenderer {
this.isDirty = false;
}
/**
* Helper function to draw text with background at world coordinates
* @param ctx Canvas context
* @param text Text to display
* @param worldX World X coordinate
* @param worldY World Y coordinate
* @param options Optional styling options
*/
drawTextWithBackground(ctx: any, text: string, worldX: number, worldY: number, options: any = {}) {
const {
font = "14px sans-serif",
textColor = "white",
backgroundColor = "rgba(0, 0, 0, 0.7)",
padding = 10,
lineHeight = 18
} = options;
ctx.save();
ctx.setTransform(1, 0, 0, 1, 0, 0);
const screenX = (worldX - this.canvas.viewport.x) * this.canvas.viewport.zoom;
const screenY = (worldY - this.canvas.viewport.y) * this.canvas.viewport.zoom;
ctx.font = font;
ctx.textAlign = "center";
ctx.textBaseline = "middle";
const lines = text.split('\n');
const textMetrics = lines.map(line => ctx.measureText(line));
const bgWidth = Math.max(...textMetrics.map(m => m.width)) + padding;
const bgHeight = lines.length * lineHeight + 4;
ctx.fillStyle = backgroundColor;
ctx.fillRect(screenX - bgWidth / 2, screenY - bgHeight / 2, bgWidth, bgHeight);
ctx.fillStyle = textColor;
lines.forEach((line, index) => {
const yPos = screenY - (bgHeight / 2) + (lineHeight / 2) + (index * lineHeight) + 2;
ctx.fillText(line, screenX, yPos);
});
ctx.restore();
}
render() {
if (this.renderAnimationFrame) {
this.isDirty = true;
@@ -156,21 +199,9 @@ export class CanvasRenderer {
const textWorldX = rect.x + rect.width / 2;
const textWorldY = rect.y + rect.height + (20 / this.canvas.viewport.zoom);
ctx.save();
ctx.setTransform(1, 0, 0, 1, 0, 0);
const screenX = (textWorldX - this.canvas.viewport.x) * this.canvas.viewport.zoom;
const screenY = (textWorldY - this.canvas.viewport.y) * this.canvas.viewport.zoom;
ctx.font = "14px sans-serif";
ctx.textAlign = "center";
ctx.textBaseline = "middle";
const textMetrics = ctx.measureText(text);
const bgWidth = textMetrics.width + 10;
const bgHeight = 22;
ctx.fillStyle = "rgba(0, 128, 0, 0.7)";
ctx.fillRect(screenX - bgWidth / 2, screenY - bgHeight / 2, bgWidth, bgHeight);
ctx.fillStyle = "white";
ctx.fillText(text, screenX, screenY);
ctx.restore();
this.drawTextWithBackground(ctx, text, textWorldX, textWorldY, {
backgroundColor: "rgba(0, 128, 0, 0.7)"
});
}
}
@@ -188,21 +219,9 @@ export class CanvasRenderer {
const textWorldX = rect.x + rect.width / 2;
const textWorldY = rect.y - (20 / this.canvas.viewport.zoom);
ctx.save();
ctx.setTransform(1, 0, 0, 1, 0, 0);
const screenX = (textWorldX - this.canvas.viewport.x) * this.canvas.viewport.zoom;
const screenY = (textWorldY - this.canvas.viewport.y) * this.canvas.viewport.zoom;
ctx.font = "14px sans-serif";
ctx.textAlign = "center";
ctx.textBaseline = "middle";
const textMetrics = ctx.measureText(text);
const bgWidth = textMetrics.width + 10;
const bgHeight = 22;
ctx.fillStyle = "rgba(0, 100, 170, 0.7)";
ctx.fillRect(screenX - bgWidth / 2, screenY - bgHeight / 2, bgWidth, bgHeight);
ctx.fillStyle = "white";
ctx.fillText(text, screenX, screenY);
ctx.restore();
this.drawTextWithBackground(ctx, text, textWorldX, textWorldY, {
backgroundColor: "rgba(0, 100, 170, 0.7)"
});
}
}
@@ -247,31 +266,8 @@ export class CanvasRenderer {
const padding = 20 / this.canvas.viewport.zoom;
const textWorldX = (minX + maxX) / 2;
const textWorldY = maxY + padding;
ctx.save();
ctx.setTransform(1, 0, 0, 1, 0, 0);
const screenX = (textWorldX - this.canvas.viewport.x) * this.canvas.viewport.zoom;
const screenY = (textWorldY - this.canvas.viewport.y) * this.canvas.viewport.zoom;
ctx.font = "14px sans-serif";
ctx.textAlign = "center";
ctx.textBaseline = "middle";
const lines = text.split('\n');
const textMetrics = lines.map(line => ctx.measureText(line));
const textBgWidth = Math.max(...textMetrics.map(m => m.width)) + 10;
const lineHeight = 18;
const textBgHeight = lines.length * lineHeight + 4;
ctx.fillStyle = "rgba(0, 0, 0, 0.7)";
ctx.fillRect(screenX - textBgWidth / 2, screenY - textBgHeight / 2, textBgWidth, textBgHeight);
ctx.fillStyle = "white";
lines.forEach((line, index) => {
const yPos = screenY - (textBgHeight / 2) + (lineHeight / 2) + (index * lineHeight) + 2;
ctx.fillText(line, screenX, yPos);
});
ctx.restore();
this.drawTextWithBackground(ctx, text, textWorldX, textWorldY);
});
}
}
@@ -315,6 +311,13 @@ export class CanvasRenderer {
ctx.stroke();
ctx.setLineDash([]);
// Display dimensions under outputAreaBounds
const dimensionsText = `${Math.round(bounds.width)}x${Math.round(bounds.height)}`;
const textWorldX = bounds.x + bounds.width / 2;
const textWorldY = bounds.y + bounds.height + (20 / this.canvas.viewport.zoom);
this.drawTextWithBackground(ctx, dimensionsText, textWorldX, textWorldY);
if (this.canvas.outputAreaShape) {
ctx.save();
ctx.strokeStyle = 'rgba(0, 255, 255, 0.9)';
@@ -462,22 +465,11 @@ export class CanvasRenderer {
const textWorldX = maskBounds.x + maskBounds.width / 2;
const textWorldY = maskBounds.y - (10 / this.canvas.viewport.zoom);
ctx.setTransform(1, 0, 0, 1, 0, 0);
const screenX = (textWorldX - this.canvas.viewport.x) * this.canvas.viewport.zoom;
const screenY = (textWorldY - this.canvas.viewport.y) * this.canvas.viewport.zoom;
ctx.font = "12px sans-serif";
ctx.textAlign = "center";
ctx.textBaseline = "middle";
const text = "Mask Drawing Area";
const textMetrics = ctx.measureText(text);
const bgWidth = textMetrics.width + 8;
const bgHeight = 18;
ctx.fillStyle = "rgba(255, 100, 100, 0.8)";
ctx.fillRect(screenX - bgWidth / 2, screenY - bgHeight / 2, bgWidth, bgHeight);
ctx.fillStyle = "white";
ctx.fillText(text, screenX, screenY);
this.drawTextWithBackground(ctx, "Mask Drawing Area", textWorldX, textWorldY, {
font: "12px sans-serif",
backgroundColor: "rgba(255, 100, 100, 0.8)",
padding: 8
});
ctx.restore();
}