OverallCanvas
This commit is contained in:
李志鹏
304
src/component/Canvas/OverallCanvas/index.vue
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304
src/component/Canvas/OverallCanvas/index.vue
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<template>
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<div class="pingpu" ref="el"><canvas ref="canvasRef"></canvas></div>
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</template>
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<script setup>
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import { fabric } from "fabric-with-all";
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import { ref, watch, onMounted } from "vue";
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const KEYS = {
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FILL_X: "location[0]",
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FILL_Y: "location[1]",
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FILL_ANGLE: "angle",
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FILL_SCALEX: "scale[0]",
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FILL_SCALEY: "scale[1]",
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FILL_GAPX: "object.gapX",
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FILL_GAPY: "object.gapY",
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O_TOP: "object.top",
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O_LEFT: "object.left",
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O_SCALE_X: "object.scaleX",
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O_SCALE_Y: "object.scaleY",
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O_OPACITY: "object.opacity",
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O_ANGLE: "object.angle",
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O_FLIPX: "object.flipX",
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O_FLIPY: "object.flipY",
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O_BLENDMODE: "object.blendMode",
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};
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const ACTIONS = {
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ADD: "add",
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SELECT: "select",
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UPDATE: "update",
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DELETE: "delete",
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SORT: "sort",
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};
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const emit = defineEmits(["change-canvas"]);
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const props = defineProps({
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list: { type: Array, default: () => [] },
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});
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const el = ref(null);
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const canvasRef = ref(null);
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const observer = ref(null);
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var canvas = null;
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onMounted(async () => {
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initCanvas();
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await setCanvasData();
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let throttleTimeout = null;
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let lastRunTime = 0;
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let trailingTimeout = null;
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observer.value = new ResizeObserver((entries) => {
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const now = Date.now();
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const throttleDelay = 100;
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if (!throttleTimeout) {
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updateCanvasSize();
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lastRunTime = now;
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throttleTimeout = setTimeout(() => {
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throttleTimeout = null;
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}, throttleDelay);
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} else {
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clearTimeout(trailingTimeout);
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trailingTimeout = setTimeout(() => {
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updateCanvasSize();
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lastRunTime = Date.now();
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}, throttleDelay);
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}
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});
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observer.value.observe(el.value);
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});
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onBeforeUnmount(() => {
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observer.value.disconnect();
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unbindEvent();
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});
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const initCanvas = () => {
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canvas = new fabric.Canvas(canvasRef.value, {
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selection: false,
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preserveObjectStacking: true,
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});
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canvas.setWidth(el.value.offsetWidth);
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canvas.setHeight(el.value.offsetHeight);
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bindEvent();
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};
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const updateCanvasSize = async () => {
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canvas.setWidth(el.value.offsetWidth);
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canvas.setHeight(el.value.offsetHeight);
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await setCanvasData();
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};
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// 绑定事件
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const bindEvent = () => {
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canvas.on("object:modified", onObjectModified);
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canvas.on("selection:created", onObjectSelected);
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canvas.on("selection:updated", onObjectSelected);
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};
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// 解绑事件
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const unbindEvent = () => {
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canvas.off("object:modified", onObjectModified);
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canvas.off("selection:created", onObjectSelected);
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canvas.off("selection:updated", onObjectSelected);
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};
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// 处理对象修改事件
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const onObjectModified = (e) => {
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console.log(e);
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const object = e.target;
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const action = e.action;
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const list = [];
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const id = object.id;
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if (action === "drag" || action === "rotate") {
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list.push({
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id: id,
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action: ACTIONS.UPDATE,
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key: KEYS.O_TOP,
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value: object.top,
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});
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list.push({
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id: id,
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action: ACTIONS.UPDATE,
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key: KEYS.O_LEFT,
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value: object.left,
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});
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if (action === "rotate") {
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list.push({
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id: id,
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action: ACTIONS.UPDATE,
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key: KEYS.O_ANGLE,
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value: object.angle,
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});
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}
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} else if (action === "scale") {
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list.push({
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id: id,
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action: ACTIONS.UPDATE,
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key: KEYS.O_SCALE_X,
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value: object.scaleX,
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});
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list.push({
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id: id,
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action: ACTIONS.UPDATE,
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key: KEYS.O_SCALE_Y,
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value: object.scaleY,
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});
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}
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emit("change-canvas", list);
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};
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// 对象选中
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const onObjectSelected = (e) => {
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const id = e.selected[0].id;
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const list = [
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{
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id: id,
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action: ACTIONS.SELECT,
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},
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];
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emit("change-canvas", list);
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};
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const urlToCanvas = (url) => {
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return new Promise((resolve, reject) => {
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fabric.Image.fromURL(
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url,
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(object) => {
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const imgElement = object.getElement();
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// 创建透明 Canvas
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const tcanvas = document.createElement("canvas");
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tcanvas.width = imgElement.width;
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tcanvas.height = imgElement.height;
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const ctx = tcanvas.getContext("2d");
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ctx.clearRect(0, 0, tcanvas.width, tcanvas.height);
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ctx.drawImage(imgElement, 0, 0);
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resolve(tcanvas);
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},
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{ crossOrigin: "anonymous" }
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);
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});
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};
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const setCanvasData = async () => {
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canvas.clear();
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for (let i = 0; i < props.list.length; i++) {
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let item = props.list[i];
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await addObject(item);
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}
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canvas.renderAll();
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};
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const addObject = async (item) => {
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const cwidth = canvas.width;
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const cheight = canvas.height;
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let pattern = await setFill(item);
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let rect = new fabric.Rect({
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id: item.id,
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width: cwidth,
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height: cheight,
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fill: pattern,
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...item.object,
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});
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canvas.add(rect);
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};
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const setFill = async (item) => {
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if (!item) return null;
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const cwidth = canvas.width;
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const cheight = canvas.height;
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let image = await urlToCanvas(item.path);
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let offsetX = item.location[0];
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let offsetY = item.location[1];
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let scaleX = ((cwidth / image.width) * item.scale[0]) / 5;
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let scaleY = ((cheight / image.height) * item.scale[1]) / 5;
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let scale = cwidth > cheight ? scaleX : scaleY;
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let angle = item.angle;
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let gapX = item.object.gapX;
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let gapY = item.object.gapY;
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let patternTransform = fabric.util.composeMatrix({
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scaleX: scale,
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scaleY: scale,
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angle: angle,
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});
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// 创建透明 Canvas
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let tcanvas = document.createElement("canvas");
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tcanvas.width = image.width + gapX;
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tcanvas.height = image.height + gapY;
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let ctx = tcanvas.getContext("2d");
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ctx.clearRect(0, 0, tcanvas.width, tcanvas.height);
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ctx.drawImage(image, 0, 0);
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let pattern = new fabric.Pattern({
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source: tcanvas,
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repeat: "repeat",
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patternTransform,
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offsetX, // 水平偏移
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offsetY, // 垂直偏移
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});
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return pattern;
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};
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const updataList = async (list) => {
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const objects = canvas.getObjects();
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// list.forEach((item) => {
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for (let i = 0; i < list.length; i++) {
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let item = list[i];
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let object = objects.find((o) => o.id === item.id);
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if (item.action === ACTIONS.UPDATE) {
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let value = item.value;
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switch (item.key) {
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case KEYS.O_TOP:
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object.set("top", value);
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break;
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case KEYS.O_LEFT:
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object.set("left", value);
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break;
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case KEYS.O_OPACITY:
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object.set("opacity", value);
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break;
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case KEYS.O_SCALE_X:
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object.set("scaleX", value);
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break;
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case KEYS.O_SCALE_Y:
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object.set("scaleY", value);
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break;
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case KEYS.O_ANGLE:
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object.set("angle", value);
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break;
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case KEYS.O_FLIPX:
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object.set("flipX", value);
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break;
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case KEYS.O_FLIPY:
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object.set("flipY", value);
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break;
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case KEYS.O_BLENDMODE:
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object.set("blendMode", value);
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break;
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case KEYS.FILL_X:
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case KEYS.FILL_Y:
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case KEYS.FILL_ANGLE:
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case KEYS.FILL_SCALEX:
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case KEYS.FILL_SCALEY:
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case KEYS.FILL_GAPX:
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case KEYS.FILL_GAPY:
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let pattern = await setFill(
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props.list.find((v) => v.id === item.id)
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);
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object.set("fill", pattern);
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break;
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}
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} else if (item.action === ACTIONS.SELECT) {
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canvas.setActiveObject(object);
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} else if (item.action === ACTIONS.SORT) {
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let ids = item.ids;
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canvas.clear();
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for (let j = 0; j < ids.length; j++) {
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let id = ids[j];
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let object = objects.find((o) => o.id === id);
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canvas.add(object);
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}
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canvas.renderAll();
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} else if (item.action === ACTIONS.DELETE) {
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canvas.remove(object);
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} else if (item.action === ACTIONS.ADD) {
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await addObject(item.data);
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}
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}
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canvas.renderAll();
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};
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defineExpose({
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updataList,
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});
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</script>
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<style lang='less' scoped>
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.pingpu {
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width: 100%;
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height: 100%;
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}
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</style>
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