621 lines
16 KiB
TypeScript
621 lines
16 KiB
TypeScript
/**
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* 图形涂色方法
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* 根据图形类型绘制到Canvas
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*
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* 支持的图形类型:
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* - circle:圆形
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* - ellipse:椭圆
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* - square:正方形
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* - rectangle:矩形
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* - triangle:三角形
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* - parallelogram:平行四边形
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* - diamond:菱形
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* - trapezoid:梯形
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* - pentagon:五边形
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* - hexagon:六边形
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* - pentagram:五角星
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* - heart:心形
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* - semicircle:半圆
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* - sector:扇形
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* - ring:圆环
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*/
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import { ShapeCard } from '../constants/shapes';
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// 绘制各种图形的辅助函数
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// 绘制圆形
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function drawCircle(
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ctx: RenderingContext,
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x: number,
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y: number,
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radius: number,
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fillColor: string,
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) {
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ctx.beginPath();
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ctx.arc(x, y, radius, 0, Math.PI * 2);
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制椭圆形
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function drawEllipse(
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ctx: RenderingContext,
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x: number,
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y: number,
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rx: number,
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ry: number,
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fillColor: string,
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) {
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ctx.beginPath();
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ctx.ellipse(x, y, rx, ry, 0, 0, Math.PI * 2);
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制正方形
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function drawSquare(
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ctx: RenderingContext,
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x: number,
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y: number,
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size: number,
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fillColor: string,
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) {
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fillRect(x - size / 2, y - size / 2, size, size);
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.strokeRect(x - size / 2, y - size / 2, size, size);
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}
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// 绘制矩形
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function drawRectangle(
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ctx: RenderingContext,
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x: number,
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y: number,
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width: number,
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height: number,
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fillColor: string,
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) {
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fillRect(x - width / 2, y - height / 2, width, height);
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.strokeRect(x - width / 2, y - height / 2, width, height);
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}
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// 绘制三角形(可指定类型:钝角、直角、锐角)
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function drawTriangle(
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ctx: RenderingContext,
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x: number,
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y: number,
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size: number,
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type: string,
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fillColor: string,
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) {
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ctx.beginPath();
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switch (type) {
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case 'obtuse':
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ctx.moveTo(x - size * 0.6, y - size * 0.4);
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ctx.lineTo(x + size * 0.8, y + size * 0.6);
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ctx.lineTo(x - size * 0.2, y + size * 0.4);
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break;
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case 'right':
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ctx.moveTo(x - size * 0.4, y - size * 0.4);
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ctx.lineTo(x - size * 0.4, y + size * 0.6);
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ctx.lineTo(x + size * 0.6, y + size * 0.6);
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break;
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case 'acute':
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default:
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ctx.moveTo(x, y - size * 0.5);
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ctx.lineTo(x - size * 0.5, y + size * 0.5);
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ctx.lineTo(x + size * 0.5, y + size * 0.5);
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break;
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}
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制平行四边形
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function drawParallelogram(
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ctx: RenderingContext,
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x: number,
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y: number,
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width: number,
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height: number,
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fillColor: string,
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) {
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const offset = width * 0.2;
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ctx.beginPath();
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ctx.moveTo(x - width / 2 + offset, y - height / 2);
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ctx.lineTo(x + width / 2 + offset, y - height / 2);
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ctx.lineTo(x + width / 2 - offset, y + height / 2);
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ctx.lineTo(x - width / 2 - offset, y + height / 2);
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制菱形
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function drawDiamond(
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ctx: RenderingContext,
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x: number,
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y: number,
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size: number,
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fillColor: string,
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) {
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// 参考SVG: <polygon points="50,15 70,50 50,85 30,50"/>
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// 以(x, y)为中心,size为半高,按SVG比例映射四个点
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// SVG中心(50,50),顶点(50,15),右(70,50),下(50,85),左(30,50)
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// 计算比例
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// 顶点: (0, -0.7*size)
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// 右: (0.4*size, 0)
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// 下: (0, 0.7*size)
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// 左: (-0.4*size, 0)
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const topY = y - size * 0.7;
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const rightX = x + size * 0.4;
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const bottomY = y + size * 0.7;
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const leftX = x - size * 0.4;
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ctx.beginPath();
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ctx.moveTo(x, topY); // 顶点
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ctx.lineTo(rightX, y); // 右
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ctx.lineTo(x, bottomY); // 下
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ctx.lineTo(leftX, y); // 左
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制梯形
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// 保证绘制的是等腰梯形:上下底居中,左右腰等长
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function drawTrapezoid(
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ctx: RenderingContext,
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x: number,
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y: number,
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width: number,
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height: number,
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fillColor: string,
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) {
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// topWidth 为上底宽度,width 为下底宽度
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const topWidth = width * 0.6; // 上底
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const bottomWidth = width; // 下底
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const halfHeight = height / 2;
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// 上底中心点与下底中心点重合,左右对称
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ctx.beginPath();
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// 上底左点
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ctx.moveTo(x - topWidth / 2, y - halfHeight);
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// 上底右点
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ctx.lineTo(x + topWidth / 2, y - halfHeight);
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// 下底右点
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ctx.lineTo(x + bottomWidth / 2, y + halfHeight);
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// 下底左点
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ctx.lineTo(x - bottomWidth / 2, y + halfHeight);
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制多边形
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function drawPolygon(
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ctx: RenderingContext,
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x: number,
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y: number,
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radius: number,
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sides: number,
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fillColor: string,
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) {
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ctx.beginPath();
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for (let i = 0; i < sides; i++) {
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const angle = (i * 2 * Math.PI) / sides - Math.PI / 2;
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const px = x + Math.cos(angle) * radius;
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const py = y + Math.sin(angle) * radius;
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if (i === 0) ctx.moveTo(px, py);
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else ctx.lineTo(px, py);
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}
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制星形(五角星等)
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// 按SVG <polygon points="50,20 61,42 85,44 67,60 71,85 50,75 29,85 33,60 15,44 39,42"> 路径绘制五角星
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function drawStar(
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ctx: RenderingContext,
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x: number,
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y: number,
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radius: number,
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points: number,
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fillColor: string,
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) {
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// SVG原始点
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const svgPoints = [
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[50, 20],
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[61, 42],
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[85, 44],
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[67, 60],
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[71, 85],
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[50, 75],
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[29, 85],
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[33, 60],
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[15, 44],
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[39, 42],
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];
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// SVG中心(50,50),最大半径约为35(从50,50到15,44的距离),SVG坐标范围大致为[15,85]
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// 归一化到以(x, y)为中心,radius为最大半径
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const svgCenterX = 50;
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const svgCenterY = 50;
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const svgRadius = 35; // 50-15=35
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ctx.beginPath();
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svgPoints.forEach(([px, py], idx) => {
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const nx = x + ((px - svgCenterX) / svgRadius) * radius;
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const ny = y + ((py - svgCenterY) / svgRadius) * radius;
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if (idx === 0) ctx.moveTo(nx, ny);
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else ctx.lineTo(nx, ny);
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});
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制爱心
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function drawHeart(
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ctx: RenderingContext,
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x: number,
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y: number,
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size: number,
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fillColor: string,
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) {
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// 放大爱心:将原本的缩放比例从60缩小为50,使爱心整体变大
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// 以SVG路径为参考,原始SVG中心为(50,50),宽高约为60x60
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// 这里size为整体缩放,x,y为中心点
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// SVG关键点:M50,35 C35,20 20,35 25,50 C30,65 50,80 50,80 C50,80 70,65 75,50 C80,35 65,20 50,35Z
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// 归一化函数
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const scale = 40; // 原来是60,改为50,放大
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function tx(px: number) {
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return x + ((px - 50) / scale) * size;
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}
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function ty(py: number) {
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return y + ((py - 50) / scale) * size;
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}
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ctx.beginPath();
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ctx.moveTo(tx(50), ty(35));
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ctx.bezierCurveTo(tx(35), ty(20), tx(20), ty(35), tx(25), ty(50));
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ctx.bezierCurveTo(tx(30), ty(65), tx(50), ty(80), tx(50), ty(80));
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ctx.bezierCurveTo(tx(50), ty(80), tx(70), ty(65), tx(75), ty(50));
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ctx.bezierCurveTo(tx(80), ty(35), tx(65), ty(20), tx(50), ty(35));
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制半圆
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function drawSemicircle(
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ctx: RenderingContext,
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x: number,
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y: number,
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radius: number,
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fillColor: string,
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) {
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const verticalOffset = radius * 0.5;
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y = y + verticalOffset;
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ctx.beginPath();
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// ctx.moveTo(x, y + verticalOffset);
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// 圆弧从左(180°,Math.PI)到右(0°),逆时针画半圆,圆弧在正上方
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ctx.arc(x, y, radius, Math.PI, 0, false);
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制扇形,圆弧在正上方
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function drawSector(
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ctx: RenderingContext,
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x: number,
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y: number,
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radius: number,
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fillColor: string,
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) {
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// 为了让扇形垂直方向居中,需要将整个扇形向下平移一定距离
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// 扇形的质心大约在半径的 0.6 倍处(120°扇形),这里经验值调整
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const verticalOffset = radius * 0.5;
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ctx.beginPath();
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ctx.moveTo(x, y + verticalOffset);
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// 扇形圆弧从左上(-135°)到右上(-45°),即从 -3/4π 到 -1/4π,圆弧在正上方
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ctx.arc(
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x,
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y + verticalOffset,
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radius,
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(-3 * Math.PI) / 4,
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-Math.PI / 4,
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false,
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);
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill();
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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}
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// 绘制圆环(修正避免中间出现一条线)
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function drawRing(
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ctx: RenderingContext,
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x: number,
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y: number,
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radius: number,
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fillColor: string,
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) {
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const innerRadius = radius * 0.5;
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ctx.save();
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ctx.beginPath();
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// 外圆,顺时针
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ctx.arc(x, y, radius, 0, Math.PI * 2, false);
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// 关键:移动到内圆起点,避免连接线
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ctx.moveTo(x + innerRadius, y);
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// 内圆,逆时针
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ctx.arc(x, y, innerRadius, 0, Math.PI * 2, true);
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ctx.closePath();
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if (fillColor !== 'transparent') {
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ctx.fillStyle = fillColor;
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ctx.fill('evenodd');
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}
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ctx.strokeStyle = '#141414';
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ctx.lineWidth = 2;
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ctx.stroke();
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ctx.restore();
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}
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/**
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* 根据图形类型绘制到Canvas
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* @param ctx Canvas上下文
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* @param shape 图形对象
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* @param x 起始x坐标
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* @param y 起始y坐标
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* @param size 图形大小
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* @param fillColor 填充颜色
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*/
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export function drawShape(
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ctx: RenderingContext,
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shape: ShapeCard,
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x: number,
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y: number,
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size: number,
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fillColor: string,
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) {
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ctx.save();
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ctx.translate(x, y);
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const radius = size / 2;
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const shouldFill = fillColor !== 'transparent';
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switch (shape.id) {
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case 'circle':
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drawCircle(
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ctx,
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0,
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0,
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radius,
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shouldFill ? fillColor : 'transparent',
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);
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break;
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case 'ellipse':
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drawEllipse(
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ctx,
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0,
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0,
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radius * 0.8,
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radius * 0.5,
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shouldFill ? fillColor : 'transparent',
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);
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break;
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case 'square':
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drawSquare(
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ctx,
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0,
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0,
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radius * 1.6,
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shouldFill ? fillColor : 'transparent',
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);
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break;
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case 'rectangle':
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drawRectangle(
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ctx,
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0,
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0,
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radius * 1.8,
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radius * 1.2,
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shouldFill ? fillColor : 'transparent',
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);
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break;
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case 'obtuse-triangle':
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drawTriangle(
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ctx,
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0,
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0,
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radius,
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'obtuse',
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shouldFill ? fillColor : 'transparent',
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);
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break;
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case 'right-triangle':
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drawTriangle(
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ctx,
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0,
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0,
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radius,
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'right',
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shouldFill ? fillColor : 'transparent',
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);
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break;
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case 'acute-triangle':
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drawTriangle(
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ctx,
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0,
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0,
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radius,
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'acute',
|
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shouldFill ? fillColor : 'transparent',
|
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);
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break;
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case 'parallelogram':
|
|
drawParallelogram(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius * 1.6,
|
|
radius * 1.2,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'diamond':
|
|
drawDiamond(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'trapezoid':
|
|
drawTrapezoid(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius * 1.6,
|
|
radius * 1.2,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'pentagon':
|
|
drawPolygon(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
5,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'hexagon':
|
|
drawPolygon(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
6,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'pentagram':
|
|
drawStar(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
5,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'heart':
|
|
drawHeart(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'semicircle':
|
|
drawSemicircle(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'sector':
|
|
drawSector(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
break;
|
|
case 'ring':
|
|
drawRing(ctx, 0, 0, radius, shouldFill ? fillColor : 'transparent');
|
|
break;
|
|
default:
|
|
// 默认绘制圆形
|
|
drawCircle(
|
|
ctx,
|
|
0,
|
|
0,
|
|
radius,
|
|
shouldFill ? fillColor : 'transparent',
|
|
);
|
|
}
|
|
|
|
ctx.restore();
|
|
}
|