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-rw-r--r--apps/web/src/lib/graphics/stroke.ts204
1 files changed, 102 insertions, 102 deletions
diff --git a/apps/web/src/lib/graphics/stroke.ts b/apps/web/src/lib/graphics/stroke.ts
index 98f9f43f..230d9904 100644
--- a/apps/web/src/lib/graphics/stroke.ts
+++ b/apps/web/src/lib/graphics/stroke.ts
@@ -1,102 +1,102 @@
-import type { GraphicStrokeAlign } from "./definitions/shared";
-
-type GraphicRenderContext =
- | CanvasRenderingContext2D
- | OffscreenCanvasRenderingContext2D;
-
-function createTempCanvas({
- width,
- height,
-}: {
- width: number;
- height: number;
-}): OffscreenCanvas | HTMLCanvasElement {
- try {
- return new OffscreenCanvas(width, height);
- } catch {
- const canvas = document.createElement("canvas");
- canvas.width = width;
- canvas.height = height;
- return canvas;
- }
-}
-
-function applyStroke({
- ctx,
- path,
- strokeWidth,
- strokeColor,
-}: {
- ctx: GraphicRenderContext;
- path: Path2D;
- strokeWidth: number;
- strokeColor: string;
-}) {
- ctx.strokeStyle = strokeColor;
- ctx.lineWidth = strokeWidth;
- ctx.stroke(path);
-}
-
-export function applyAlignedStroke({
- ctx,
- path,
- strokeWidth,
- strokeAlign,
- strokeColor,
-}: {
- ctx: GraphicRenderContext;
- path: Path2D;
- strokeWidth: number;
- strokeAlign: GraphicStrokeAlign;
- strokeColor: string;
-}): void {
- if (strokeWidth <= 0) {
- return;
- }
-
- if (strokeAlign === "inside") {
- ctx.save();
- ctx.clip(path);
- applyStroke({
- ctx,
- path,
- strokeWidth: strokeWidth * 2,
- strokeColor,
- });
- ctx.restore();
- return;
- }
-
- if (strokeAlign === "outside") {
- const strokeCanvas = createTempCanvas({
- width: ctx.canvas.width,
- height: ctx.canvas.height,
- });
- const strokeCtx = strokeCanvas.getContext("2d") as GraphicRenderContext | null;
- if (!strokeCtx) {
- return;
- }
-
- applyStroke({
- ctx: strokeCtx,
- path,
- strokeWidth: strokeWidth * 2,
- strokeColor,
- });
-
- // Keep only the outer half of the doubled stroke so alpha fills do not
- // leave a visible inner stroke behind.
- strokeCtx.globalCompositeOperation = "destination-out";
- strokeCtx.fill(path);
-
- ctx.drawImage(strokeCanvas, 0, 0);
- return;
- }
-
- applyStroke({
- ctx,
- path,
- strokeWidth,
- strokeColor,
- });
-}
+import type { GraphicStrokeAlign } from "./definitions/shared";
+
+type GraphicRenderContext =
+ | CanvasRenderingContext2D
+ | OffscreenCanvasRenderingContext2D;
+
+function createTempCanvas({
+ width,
+ height,
+}: {
+ width: number;
+ height: number;
+}): OffscreenCanvas | HTMLCanvasElement {
+ try {
+ return new OffscreenCanvas(width, height);
+ } catch {
+ const canvas = document.createElement("canvas");
+ canvas.width = width;
+ canvas.height = height;
+ return canvas;
+ }
+}
+
+function applyStroke({
+ ctx,
+ path,
+ strokeWidth,
+ strokeColor,
+}: {
+ ctx: GraphicRenderContext;
+ path: Path2D;
+ strokeWidth: number;
+ strokeColor: string;
+}) {
+ ctx.strokeStyle = strokeColor;
+ ctx.lineWidth = strokeWidth;
+ ctx.stroke(path);
+}
+
+export function applyAlignedStroke({
+ ctx,
+ path,
+ strokeWidth,
+ strokeAlign,
+ strokeColor,
+}: {
+ ctx: GraphicRenderContext;
+ path: Path2D;
+ strokeWidth: number;
+ strokeAlign: GraphicStrokeAlign;
+ strokeColor: string;
+}): void {
+ if (strokeWidth <= 0) {
+ return;
+ }
+
+ if (strokeAlign === "inside") {
+ ctx.save();
+ ctx.clip(path);
+ applyStroke({
+ ctx,
+ path,
+ strokeWidth: strokeWidth * 2,
+ strokeColor,
+ });
+ ctx.restore();
+ return;
+ }
+
+ if (strokeAlign === "outside") {
+ const strokeCanvas = createTempCanvas({
+ width: ctx.canvas.width,
+ height: ctx.canvas.height,
+ });
+ const strokeCtx = strokeCanvas.getContext("2d") as GraphicRenderContext | null;
+ if (!strokeCtx) {
+ return;
+ }
+
+ applyStroke({
+ ctx: strokeCtx,
+ path,
+ strokeWidth: strokeWidth * 2,
+ strokeColor,
+ });
+
+ // Keep only the outer half of the doubled stroke so alpha fills do not
+ // leave a visible inner stroke behind.
+ strokeCtx.globalCompositeOperation = "destination-out";
+ strokeCtx.fill(path);
+
+ ctx.drawImage(strokeCanvas, 0, 0);
+ return;
+ }
+
+ applyStroke({
+ ctx,
+ path,
+ strokeWidth,
+ strokeColor,
+ });
+}