77 lines
2.9 KiB
JavaScript
77 lines
2.9 KiB
JavaScript
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/** 绘制换行字体原型方法 */
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export default {
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name: 'fillWarpText',
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handle: (canvas, ctx, config) => {
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const newConfig = config = Object.assign({ maxWidth: 100, layer: 2, lineHeight: Number(ctx.font.replace(/[^0-9.]/g, '')), x: 0, y: Number(ctx.font.replace(/[^0-9.]/g, '')) / 1.2, splitText: '', notFillText: false }, config);
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const { text, splitText, maxWidth, layer, lineHeight, notFillText, x, y } = newConfig;
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// 当字符串为空时, 抛出错误
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if (!text) {
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throw Error('warpFillText Error: text is empty string');
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}
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// 分割所有单个字符串
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const chr = text.split(splitText);
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// 存入的每行字体的容器
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let row = [];
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// 判断字符串
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let timp = '';
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if (splitText) {
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row = chr;
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}
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else {
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// 遍历所有字符串, 填充行容器
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for (let i = 0; i < chr.length; i++) {
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// 当超出行列时, 停止执行遍历, 节省计算时间
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if (row.length > layer) {
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break;
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}
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if (ctx.measureText(timp).width < maxWidth) {
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// 如果超出长度, 添加进row数组
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timp += chr[i];
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}
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else {
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// 如超出一行长度, 则换行, 并清除容器
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i--;
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row.push(timp);
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timp = '';
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}
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}
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// 如有剩下字体, 则在最后时添加一行
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if (timp) {
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row.push(timp);
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}
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// 如果数组长度大于指定行数
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if (row.length > layer) {
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row = row.slice(0, layer);
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// 结束的索引
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const end = layer - 1;
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for (let i = 0; i < row[end].length; i++) {
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const currentWidth = ctx.measureText(`${row[end]}...`).width;
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if (currentWidth > maxWidth) {
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// 加上... 当前宽度大于最大宽度时, 去除一位字符串
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const strEnd = row[end].length - 1;
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row[end] = row[end].slice(0, strEnd);
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}
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else {
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row[end] += '...';
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break;
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}
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}
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}
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}
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// 储存并返回绘制信息
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const drawInfos = row.map((item, index) => {
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const info = {
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text: item,
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y: y + index * lineHeight,
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x: x,
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};
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// 默认执行绘制信息
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if (!notFillText) {
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ctx.fillText(info.text, info.x, info.y);
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}
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return info;
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});
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return drawInfos;
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}
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};
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