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engine/dev/draw.ts

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+import type { Polygon } from "#/engine/Polygon.ts";
+import type { Vector } from "#/engine/Vector.ts";
+
+export function drawPoint(
+	ctx: CanvasRenderingContext2D,
+	position: Vector,
+	radius: number = 1,
+	color: string = "#fff",
+): void {
+	ctx.beginPath();
+	ctx.arc(position.x, position.y, radius, 0, 2 * Math.PI);
+	ctx.fillStyle = color;
+	ctx.fill();
+}
+
+export function drawPolygon(
+	ctx: CanvasRenderingContext2D,
+	polygon: Polygon,
+	color: string = "#fff",
+): void {
+	drawPoint(ctx, polygon.position);
+	ctx.beginPath();
+	ctx.moveTo(
+		polygon.points[0].x + polygon.position.x,
+		polygon.points[0].y + polygon.position.y,
+	);
+
+	for (let i = polygon.points.length - 1; i >= 0; i--) {
+		ctx.lineTo(
+			polygon.points[i].x + polygon.position.x,
+			polygon.points[i].y + polygon.position.y,
+		);
+	}
+
+	ctx.strokeStyle = color;
+	ctx.stroke();
+}