132 lines
3.3 KiB
Vue
132 lines
3.3 KiB
Vue
<script lang="ts" setup>
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const canvas = useTemplateRef("canvas");
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const updateCallbacks = new Set<UpdateCallback>();
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const renderCallbacks = new Set<RenderCallback>();
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const screenClickCallbacks = new Set<ScreenClickCallback>();
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const screenMouseWheelCallbacks = new Set<ScreenMouseWheelCallback>();
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let ctx: CanvasRenderingContext2D | null = null;
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let animationFrameId: number | null = null;
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let lastFrameTime = 0;
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let lastRealFrameTime = 0;
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const registerUpdateCallback = (callback: UpdateCallback) => {
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updateCallbacks.add(callback);
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return () => updateCallbacks.delete(callback);
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};
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const registerRenderCallback = (callback: RenderCallback) => {
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renderCallbacks.add(callback);
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return () => renderCallbacks.delete(callback);
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};
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const registerScreenClickCallback = (callback: ScreenClickCallback) => {
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screenClickCallbacks.add(callback);
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return () => screenClickCallbacks.delete(callback);
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};
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const registerScreenMouseWheelCallback = (
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callback: ScreenMouseWheelCallback,
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) => {
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screenMouseWheelCallbacks.add(callback);
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return () => screenMouseWheelCallbacks.delete(callback);
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};
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const handleCanvasClick = (event: MouseEvent) => {
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if (!canvas.value) return;
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const rect = canvas.value.getBoundingClientRect();
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const scaleX = SCREEN_WIDTH / rect.width;
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const scaleY = SCREEN_HEIGHT / rect.height;
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const x = (event.clientX - rect.left) * scaleX;
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const y = (event.clientY - rect.top) * scaleY;
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for (const callback of screenClickCallbacks) {
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callback(x, y);
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}
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};
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const handleCanvasWheel = (event: WheelEvent) => {
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for (const callback of screenMouseWheelCallbacks) {
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callback(event.deltaY, event.deltaX);
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}
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};
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const renderFrame = (timestamp: number) => {
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if (!ctx) return;
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const deltaTime = timestamp - lastFrameTime;
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lastFrameTime = timestamp;
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const start = Date.now();
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// update
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for (const callback of updateCallbacks) {
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callback(deltaTime, lastRealFrameTime);
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}
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// render
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ctx.clearRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
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for (const callback of renderCallbacks) {
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ctx.save();
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callback(ctx);
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ctx.restore();
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}
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lastRealFrameTime = Date.now() - start;
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animationFrameId = requestAnimationFrame(renderFrame);
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};
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provide("registerUpdateCallback", registerUpdateCallback);
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provide("registerRenderCallback", registerRenderCallback);
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provide("registerScreenClickCallback", registerScreenClickCallback);
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provide("registerScreenMouseWheelCallback", registerScreenMouseWheelCallback);
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onMounted(() => {
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if (!canvas.value) throw new Error("Missing canvas");
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ctx = canvas.value.getContext("2d");
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if (!ctx) throw new Error("Missing 2d context");
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canvas.value.addEventListener("click", handleCanvasClick);
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canvas.value.addEventListener("wheel", handleCanvasWheel, { passive: true });
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animationFrameId = requestAnimationFrame(renderFrame);
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});
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onUnmounted(() => {
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if (animationFrameId !== null) {
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cancelAnimationFrame(animationFrameId);
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}
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if (canvas.value) {
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canvas.value.removeEventListener("click", handleCanvasClick);
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canvas.value.removeEventListener("wheel", handleCanvasWheel);
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}
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});
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defineExpose({
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canvas,
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});
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</script>
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<template>
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<canvas
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ref="canvas"
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:width="SCREEN_WIDTH"
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:height="SCREEN_HEIGHT"
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:style="{
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margin: '0',
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border: '1px solid red',
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}"
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/>
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<slot v-if="canvas" />
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</template>
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