378 lines
9.6 KiB
Vue
378 lines
9.6 KiB
Vue
<!-- 子组件 transform-canvas.vue -->
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<template>
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<view>
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<canvas
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id="myCanvas"
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canvas-id="myCanvas"
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type="2d"
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:style="{
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width: `${canvasDisplayWidth}px`,
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height: `${canvasDisplayHeight}px`,
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border: '1px solid #eee'
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}"
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></canvas>
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</view>
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</template>
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<script>
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export default {
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props: {
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width: Number, // 画布实际宽度(像素)
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height: Number, // 画布实际高度(像素)
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imgUrl: String, // 图片URL
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matrix: { // 变换矩阵
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type: Object,
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default: () => ({
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a: 1, b: 0, c: 0, d: 1, tx: 0, ty: 0
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})
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},
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areaData:{},
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seatData:{},
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selectedCodes:{}
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},
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data() {
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return {
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canvasContext: null,
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image: null,
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dpr: 1,
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canvasDisplayWidth: 800, // 默认显示尺寸
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canvasDisplayHeight: 600,
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canvasActualWidth: 800, // 实际像素尺寸
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canvasActualHeight: 600,
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nowSelectedCodes:this.selectedCodes
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};
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},
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watch: {
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selectedCodes:{
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handler(newVal) {
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this.nowSelectedCodes = newVal
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},
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immediate: true
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},
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imgUrl: {
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handler(newUrl) {
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if (newUrl) this.loadImage(newUrl);
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},
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immediate: true
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},
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width: {
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handler() {
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this.updateCanvasSize();
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},
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immediate: true
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},
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height: {
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handler() {
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this.updateCanvasSize();
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},
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immediate: true
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},
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matrix: {
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deep: true,
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immediate: true, // 添加立即触发
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handler() {
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this.$nextTick(this.redraw); // 确保在下一个tick重绘
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}
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},
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areaData: {
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deep: true,
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handler() {
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this.$nextTick(this.redraw);
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}
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},
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seatData: {
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deep: true,
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handler() {
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this.$nextTick(this.redraw);
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}
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}
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},
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mounted() {
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this.initCanvas();
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},
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methods: {
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invertPoint(x, y) {
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// 注意：直接使用矩阵的逆转换，不需要除以dpr
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const inverted = this.matrix.invertPoint(x, y);
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return inverted;
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},
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// 添加点击检测方法
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checkHitArea(x, y) {
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if (!this.areaData) return null;
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// 转换坐标到原始画布空间
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const inverted = this.matrix.invertPoint(x, y, this.dpr);
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console.log('checkHitArea',inverted)
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// 遍历所有区域检测
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for (const area of this.areaData) {
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if (this.pointInPolygon(inverted.x, inverted.y, area.polygon)) {
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return area;
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}
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}
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return null;
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},
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pointInPolygon(x, y, polygon) {
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const points = [];
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for (let i = 0; i < polygon.length; i += 2) {
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points.push([polygon[i], polygon[i + 1]]);
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}
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let inside = false;
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let j = points.length - 1;
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for (let i = 0; i < points.length; j = i++) {
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const [xi, yi] = points[i];
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const [xj, yj] = points[j];
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// 检测点是否在线段上
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if (this.pointOnLineSegment(x, y, xi, yi, xj, yj)) return true;
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// 射线法核心逻辑
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if (yi <= y && yj > y || yj <= y && yi > y) {
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const slope = (xj - xi) / (yj - yi);
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if (x <= xi + (y - yi) * slope) {
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inside = !inside;
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}
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}
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}
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return inside;
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},
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// 添加点是否在线段上的检查
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pointOnLineSegment(x, y, x1, y1, x2, y2) {
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// 线段的长度
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const dx = x2 - x1;
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const dy = y2 - y1;
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const segmentLength = Math.sqrt(dx * dx + dy * dy);
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// 点到线段起点的向量
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const vx = x - x1;
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const vy = y - y1;
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// 向量在方向上的投影
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const dotProduct = vx * dx + vy * dy;
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// 计算参数t (0-1之间表示在线段上)
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const t = dotProduct / (segmentLength * segmentLength);
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// 点在线段上
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if (t >= 0 && t <= 1) {
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// 计算点在线段上的位置
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const projX = x1 + t * dx;
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const projY = y1 + t * dy;
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// 检查点与投影点的距离（容差5px）
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const distance = Math.sqrt((x - projX) * 2 + (y - projY) * 2);
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return distance < 5;
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}
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return false;
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},
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initCanvas() {
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const query = uni.createSelectorQuery().in(this);
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query.select('#myCanvas')
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.fields({ node: true, size: true })
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.exec(async (res) => {
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if (!res[0]) return;
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this.canvas = res[0].node;
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this.ctx = res[0].node.getContext('2d');
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// 获取设备像素比
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this.dpr = uni.getSystemInfoSync().pixelRatio;
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// 更新画布尺寸
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this.updateCanvasSize();
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// 如果已有图片URL，加载图片
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if (this.imgUrl) {
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await this.loadImage(this.imgUrl);
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}
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});
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},
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updateCanvasSize() {
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// 显示尺寸使用prop传入的width/height
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this.canvasDisplayWidth = this.width;
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this.canvasDisplayHeight = this.height;
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// * this.dpr
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// * this.dpr
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// 实际像素尺寸考虑DPR
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this.canvasActualWidth = this.width;
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this.canvasActualHeight = this.height;
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if (this.canvas) {
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this.canvas.width = this.canvasActualWidth;
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this.canvas.height = this.canvasActualHeight;
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// this.ctx.scale(this.dpr, this.dpr);
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this.redraw();
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}
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},
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async loadImage(src) {
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try {
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// 等待canvas初始化
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if (!this.canvas) {
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await this.initCanvas();
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}
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this.image = await new Promise((resolve, reject) => {
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if (!this.canvas) {
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// reject(new Error("Canvas not initialized"));
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return;
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}
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const image = this.canvas.createImage();
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image.src = src;
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image.onload = () => resolve(image);
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image.onerror = reject;
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});
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this.redraw();
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} catch (e) {
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console.error("图片加载失败:", e);
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this.image = null;
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}
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},
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// 在redraw方法中添加视图判断
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checkSeatHit(x, y) {
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if (!this.seatData) return null;
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// 转换坐标到原始画布空间
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const inverted = this.matrix.invertPoint(x, y, this.dpr);
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// 遍历所有座位检测
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for (const seat of this.seatData) {
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const dx = seat.x - inverted.x;
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const dy = seat.y - inverted.y;
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const distance = Math.sqrt(dx * dx + dy * dy);
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// 命中检测（8px半径）
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if (distance < 8) {
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return seat;
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}
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}
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return null;
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},
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redraw() {
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if (!this.ctx) return;
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this.ctx.save();
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this.ctx.resetTransform();
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this.ctx.clearRect(0, 0, this.canvasActualWidth, this.canvasActualHeight);
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this.ctx.scale(this.dpr, this.dpr);
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// 应用变换矩阵
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const { a, b, c, d, tx, ty } = this.matrix;
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this.ctx.setTransform(a, b, c, d, tx, ty);
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// 仅在区域视图显示背景图片
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if (this.image && this.$parent?.currentView === 'area') {
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this.ctx.drawImage(
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this.image,
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0,
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0,
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this.canvasDisplayWidth,
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this.canvasDisplayHeight
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);
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}
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// 绘制区域（仅在区域视图）
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if (this.areaData && this.areaData.length > 0 && this.$parent?.currentView === 'area') {
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this.drawAreas();
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}
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// 绘制座位（仅在座位视图）
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if (this.seatData && this.seatData.length > 0 && this.$parent?.currentView === 'seat') {
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this.drawSeats();
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}
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this.ctx.restore();
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},
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// 添加绘制区域方法
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drawAreas() {
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this.areaData.forEach(area => {
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const points = [];
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for (let i = 0; i < area.polygon.length; i += 2) {
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points.push([area.polygon[i], area.polygon[i + 1]]);
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}
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this.ctx.beginPath();
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points.forEach(([x, y], index) => {
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if (index === 0) this.ctx.moveTo(x, y);
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else this.ctx.lineTo(x, y);
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});
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this.ctx.closePath();
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this.ctx.strokeStyle = 'rgba(255, 0, 0, 0.7)';
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this.ctx.lineWidth = 2;
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this.ctx.stroke();
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this.ctx.fillStyle = 'rgba(0, 255, 0, 0.2)';
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this.ctx.fill();
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});
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},
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drawSeats() {
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this.ctx.save();
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// 应用变换矩阵
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const { a, b, c, d, tx, ty } = this.matrix;
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this.ctx.setTransform(a, b, c, d, tx, ty);
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// 获取当前缩放比例
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const scale = Math.sqrt(a * a + b * b);
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this.seatData.forEach(seat => {
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const x = seat.x;
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const y = seat.y;
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// 根据缩放调整座位大小
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const radius = 8 / scale;
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console.log(this.nowSelectedCodes,'nowSelectedCodesnowSelectedCodesnowSelectedCodes')
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// 修改1：为选中座位添加特殊样式
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if (this.nowSelectedCodes.has(seat.code) && seat.status === 1) {
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// 1. 绘制金色边框
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this.ctx.beginPath();
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this.ctx.arc(x, y, radius + 1, 0, Math.PI * 2);
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this.ctx.strokeStyle = '#FFD700'; // 金色
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this.ctx.lineWidth = 2 / scale;
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this.ctx.stroke();
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// 2. 绘制半透明金色背景
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this.ctx.beginPath();
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this.ctx.arc(x, y, radius, 0, Math.PI * 2);
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this.ctx.fillStyle = 'rgba(255, 215, 0, 0.3)';
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this.ctx.fill();
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// 3. 绘制白色对勾（缩小版）
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this.ctx.strokeStyle = '#fff';
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this.ctx.lineWidth = 1 / scale;
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this.ctx.lineCap = 'round';
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this.ctx.beginPath();
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this.ctx.moveTo(x - 2.5, y);
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this.ctx.lineTo(x - 0.5, y + 1.5);
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this.ctx.lineTo(x + 2.5, y - 2);
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this.ctx.stroke();
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} else {
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// 普通座位的绘制保持不变
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this.ctx.beginPath();
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this.ctx.arc(x, y, radius, 0, Math.PI * 2);
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this.ctx.fillStyle = seat.status === 1 ? '#4cd964' : '#dd524d';
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this.ctx.fill();
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}
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// 仅在缩放足够大时显示文字
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});
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this.ctx.restore();
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}
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}
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}
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</script> |