84 lines
1.8 KiB
JavaScript
84 lines
1.8 KiB
JavaScript
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/**
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* 场景基类
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*/
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export default class BaseScene {
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constructor(main, params = {}) {
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this.main = main;
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this.params = params;
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this.screenWidth = main.screenWidth;
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this.screenHeight = main.screenHeight;
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this.scrollVelocity = 0;
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}
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// 初始化
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init() {}
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// 更新逻辑
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update() {}
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// 渲染
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render(ctx) {}
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// 触摸开始
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onTouchStart(e) {}
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// 触摸移动
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onTouchMove(e) {}
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// 触摸结束
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onTouchEnd(e) {}
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// 销毁
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destroy() {}
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// 绘制圆角矩形
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roundRect(ctx, x, y, width, height, radius) {
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ctx.beginPath();
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ctx.moveTo(x + radius, y);
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ctx.lineTo(x + width - radius, y);
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ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
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ctx.lineTo(x + width, y + height - radius);
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ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
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ctx.lineTo(x + radius, y + height);
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ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
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ctx.lineTo(x, y + radius);
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ctx.quadraticCurveTo(x, y, x + radius, y);
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ctx.closePath();
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}
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// 绘制多行文本
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wrapText(ctx, text, x, y, maxWidth, lineHeight) {
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const lines = [];
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let currentLine = '';
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for (let i = 0; i < text.length; i++) {
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const char = text[i];
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if (char === '\n') {
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lines.push(currentLine);
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currentLine = '';
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continue;
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}
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const testLine = currentLine + char;
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const metrics = ctx.measureText(testLine);
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if (metrics.width > maxWidth && currentLine.length > 0) {
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lines.push(currentLine);
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currentLine = char;
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} else {
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currentLine = testLine;
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}
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}
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if (currentLine.length > 0) {
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lines.push(currentLine);
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}
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lines.forEach((line, index) => {
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ctx.fillText(line, x, y + index * lineHeight);
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});
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return lines.length;
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}
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}
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