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@@ -0,0 +1,521 @@
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+const main = {
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+ /**
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+ * 渲染块
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+ * @param {Object} params
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+ */
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+ drawBlock({ text, width = 0, height, x, y, paddingLeft = 0, paddingRight = 0, borderWidth, backgroundColor, borderColor, borderRadius = 0, opacity = 1 }) {
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+ // 判断是否块内有文字
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+ let blockWidth = 0; // 块的宽度
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+ let textX = 0;
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+ let textY = 0;
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+ if (typeof text !== undefined) {
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+ // 如果有文字并且块的宽度小于文字宽度,块的宽度为 文字的宽度 + 内边距
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+ const textWidth = this._getTextWidth(typeof text.text === 'string' ? text : text.text);
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+ blockWidth = textWidth > width ? textWidth : width;
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+ blockWidth += paddingLeft + paddingLeft;
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+
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+ const { textAlign = 'left', text: textCon } = text;
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+ textY = height / 2 + y; // 文字的y轴坐标在块中线
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+ if (textAlign === 'left') {
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+ // 如果是右对齐,那x轴在块的最左边
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+ textX = x + paddingLeft;
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+ } else if (textAlign === 'center') {
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+ textX = blockWidth / 2 + x;
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+ } else {
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+ textX = x + blockWidth - paddingRight;
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+ }
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+ } else {
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+ blockWidth = width;
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+ }
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+
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+ if (backgroundColor) {
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+ // 画面
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+ this.ctx.save();
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+ this.ctx.setGlobalAlpha(opacity);
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+ this.ctx.setFillStyle(backgroundColor);
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+ if (borderRadius > 0) {
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+ // 画圆角矩形
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+ this._drawRadiusRect(x, y, blockWidth, height, borderRadius);
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+ this.ctx.fill();
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+ } else {
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+ this.ctx.fillRect(this.toPx(x), this.toPx(y), this.toPx(blockWidth), this.toPx(height));
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+ }
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+ this.ctx.restore();
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+ }
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+ if (borderWidth) {
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+ // 画线
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+ this.ctx.save();
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+ this.ctx.setGlobalAlpha(opacity);
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+ this.ctx.setStrokeStyle(borderColor);
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+ this.ctx.setLineWidth(this.toPx(borderWidth));
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+ if (borderRadius > 0) {
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+ // 画圆角矩形边框
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+ this._drawRadiusRect(x, y, blockWidth, height, borderRadius);
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+ this.ctx.stroke();
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+ } else {
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+ this.ctx.strokeRect(this.toPx(x), this.toPx(y), this.toPx(blockWidth), this.toPx(height));
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+ }
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+ this.ctx.restore();
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+ }
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+
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+ if (text) {
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+ this.drawText(Object.assign(text, { x: textX, y: textY }))
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+ }
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+ },
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+
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+ /**
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+ * 渲染文字
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+ * @param {Object} params
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+ */
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+ drawText(params) {
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+ const { x, y, fontSize, color, baseLine, textAlign, text, opacity = 1, width, lineNum, lineHeight } = params;
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+ if (Object.prototype.toString.call(text) === '[object Array]') {
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+ let preText = { x, y, baseLine };
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+ text.forEach(item => {
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+ preText.x += item.marginLeft || 0;
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+ const textWidth = this._drawSingleText(Object.assign(item, {
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+ ...preText,
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+ }));
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+ preText.x += textWidth + (item.marginRight || 0); // 下一段字的x轴为上一段字x + 上一段字宽度
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+ })
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+ } else {
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+ this._drawSingleText(params);
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+ }
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+ },
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+
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+ /**
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+ * 渲染图片
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+ */
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+ drawImage(data) {
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+ const { imgPath, x, y, w, h, sx, sy, sw, sh, borderRadius = 0, borderWidth = 0, borderColor } = data;
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+ this.ctx.save();
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+ if (borderRadius > 0) {
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+ this._drawRadiusRect(x, y, w, h, borderRadius);
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+ this.ctx.strokeStyle = 'rgba(255,255,255,0)';
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+ this.ctx.stroke();
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+ this.ctx.clip();
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+ this.ctx.drawImage(imgPath, this.toPx(sx), this.toPx(sy), this.toPx(sw), this.toPx(sh), this.toPx(x), this.toPx(y), this.toPx(w), this.toPx(h));
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+ if (borderWidth > 0) {
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+ this.ctx.setStrokeStyle(borderColor);
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+ this.ctx.setLineWidth(this.toPx(borderWidth));
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+ this.ctx.stroke();
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+ }
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+ } else {
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+ this.ctx.drawImage(imgPath, this.toPx(sx), this.toPx(sy), this.toPx(sw), this.toPx(sh), this.toPx(x), this.toPx(y), this.toPx(w), this.toPx(h));
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+ }
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+ this.ctx.restore();
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+ },
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+ /**
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+ * 渲染线
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+ * @param {*} param0
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+ */
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+ drawLine({ startX, startY, endX, endY, color, width }) {
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+ this.ctx.save();
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+ this.ctx.beginPath();
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+ this.ctx.setStrokeStyle(color);
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+ this.ctx.setLineWidth(this.toPx(width));
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+ this.ctx.moveTo(this.toPx(startX), this.toPx(startY));
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+ this.ctx.lineTo(this.toPx(endX), this.toPx(endY));
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+ this.ctx.stroke();
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+ this.ctx.closePath();
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+ this.ctx.restore();
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+ },
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+ downloadResource({ images = [], pixelRatio = 1 }) {
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+ const drawList = [];
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+ this.drawArr = [];
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+ images.forEach((image, index) => drawList.push(this._downloadImageAndInfo(image, index, pixelRatio)));
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+ return Promise.all(drawList);
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+ },
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+ initCanvas(w, h, debug) {
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+ return new Promise((resolve) => {
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+ this.setData({
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+ pxWidth: this.toPx(w),
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+ pxHeight: this.toPx(h),
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+ debug,
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+ }, resolve);
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+ });
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+ }
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+}
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+const handle = {
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+ /**
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+ * 画圆角矩形
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+ */
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+ _drawRadiusRect(x, y, w, h, r) {
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+ const br = r / 2;
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+ this.ctx.beginPath();
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+ this.ctx.moveTo(this.toPx(x + br), this.toPx(y)); // 移动到左上角的点
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+ this.ctx.lineTo(this.toPx(x + w - br), this.toPx(y));
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+ this.ctx.arc(this.toPx(x + w - br), this.toPx(y + br), this.toPx(br), 2 * Math.PI * (3 / 4), 2 * Math.PI * (4 / 4))
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+ this.ctx.lineTo(this.toPx(x + w), this.toPx(y + h - br));
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+ this.ctx.arc(this.toPx(x + w - br), this.toPx(y + h - br), this.toPx(br), 0, 2 * Math.PI * (1 / 4))
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+ this.ctx.lineTo(this.toPx(x + br), this.toPx(y + h));
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+ this.ctx.arc(this.toPx(x + br), this.toPx(y + h - br), this.toPx(br), 2 * Math.PI * (1 / 4), 2 * Math.PI * (2 / 4))
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+ this.ctx.lineTo(this.toPx(x), this.toPx(y + br));
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+ this.ctx.arc(this.toPx(x + br), this.toPx(y + br), this.toPx(br), 2 * Math.PI * (2 / 4), 2 * Math.PI * (3 / 4))
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+ },
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+ /**
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+ * 计算文本长度
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+ * @param {Array|Object}} text 数组 或者 对象
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+ */
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+ _getTextWidth(text) {
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+ let texts = [];
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+ if (Object.prototype.toString.call(text) === '[object Object]') {
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+ texts.push(text);
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+ } else {
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+ texts = text;
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+ }
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+ let width = 0;
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+ texts.forEach(({ fontSize, text, marginLeft = 0, marginRight = 0 }) => {
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+ this.ctx.setFontSize(this.toPx(fontSize));
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+ width += this.ctx.measureText(text).width + marginLeft + marginRight;
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+ })
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+
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+ return this.toRpx(width);
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+ },
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+ /**
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+ * 渲染一段文字
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+ */
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+ _drawSingleText({ x, y, fontSize, color, baseLine, textAlign = 'left', text, opacity = 1, textDecoration = 'none',
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+ width, lineNum = 1, lineHeight = 0, fontWeight = 'normal', fontStyle = 'normal', fontFamily = "sans-serif"}) {
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+ this.ctx.save();
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+ this.ctx.beginPath();
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+ this.ctx.font = fontStyle + " " + fontWeight + " " + this.toPx(fontSize, true) + "px " + fontFamily
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+ this.ctx.setGlobalAlpha(opacity);
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+ // this.ctx.setFontSize(this.toPx(fontSize));
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+ this.ctx.setFillStyle(color);
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+ this.ctx.setTextBaseline(baseLine);
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+ this.ctx.setTextAlign(textAlign);
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+ let textWidth = this.toRpx(this.ctx.measureText(text).width);
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+ const textArr = [];
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+ if (textWidth > width) {
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+ // 文本宽度 大于 渲染宽度
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+ let fillText = '';
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+ let line = 1;
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+ for (let i = 0; i <= text.length - 1 ; i++) { // 将文字转为数组,一行文字一个元素
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+ fillText = fillText + text[i];
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+ if (this.toRpx(this.ctx.measureText(fillText).width) >= width) {
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+ if (line === lineNum) {
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+ if (i !== text.length - 1) {
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+ fillText = fillText.substring(0, fillText.length - 1) + '...';
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+ }
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+ }
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+ if(line <= lineNum) {
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+ textArr.push(fillText);
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+ }
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+ fillText = '';
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+ line++;
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+ } else {
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+ if(line <= lineNum) {
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+ if(i === text.length -1){
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+ textArr.push(fillText);
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+ }
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+ }
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+ }
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+ }
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+ textWidth = width;
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+ } else {
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+ textArr.push(text);
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+ }
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+
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+ textArr.forEach((item, index) => {
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+ this.ctx.fillText(item, this.toPx(x), this.toPx(y + (lineHeight || fontSize) * index));
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+ })
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+
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+ this.ctx.restore();
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+
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+ // textDecoration
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+ if (textDecoration !== 'none') {
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+ let lineY = y;
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+ if (textDecoration === 'line-through') {
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+ // 目前只支持贯穿线
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+ lineY = y;
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+
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+ // 小程序画布baseLine偏移阈值
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+ let threshold = 5;
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+
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+ // 根据baseLine的不同对贯穿线的Y坐标做相应调整
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+ switch (baseLine) {
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+ case 'top':
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+ lineY += fontSize / 2 + threshold;
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+ break;
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+ case 'middle':
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+ break;
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+ case 'bottom':
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+ lineY -= fontSize / 2 + threshold;
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+ break;
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+ default:
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+ lineY -= fontSize / 2 - threshold;
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+ break;
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+ }
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+ }
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+ this.ctx.save();
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+ this.ctx.moveTo(this.toPx(x), this.toPx(lineY));
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+ this.ctx.lineTo(this.toPx(x) + this.toPx(textWidth), this.toPx(lineY));
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+ this.ctx.setStrokeStyle(color);
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+ this.ctx.stroke();
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+ this.ctx.restore();
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+ }
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+
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+ return textWidth;
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+ },
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+}
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+const helper = {
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+ /**
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+ * 下载图片并获取图片信息
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+ */
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+ _downloadImageAndInfo(image, index, pixelRatio) {
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+ return new Promise((resolve, reject) => {
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+ const { x, y, url, zIndex } = image;
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+ const imageUrl = url;
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+ // 下载图片
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+ this._downImage(imageUrl, index)
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+ // 获取图片信息
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+ .then(imgPath => this._getImageInfo(imgPath, index))
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+ .then(({ imgPath, imgInfo }) => {
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+ // 根据画布的宽高计算出图片绘制的大小,这里会保证图片绘制不变形
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+ let sx;
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+ let sy;
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+ const borderRadius = image.borderRadius || 0;
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+ const setWidth = image.width;
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+ const setHeight = image.height;
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+ const width = this.toRpx(imgInfo.width / pixelRatio);
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+ const height = this.toRpx(imgInfo.height / pixelRatio);
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+
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+ if (width / height <= setWidth / setHeight) {
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+ sx = 0;
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+ sy = (height - ((width / setWidth) * setHeight)) / 2;
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+ } else {
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+ sy = 0;
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+ sx = (width - ((height / setHeight) * setWidth)) / 2;
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+ }
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+ this.drawArr.push({
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+ type: 'image',
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+ borderRadius,
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+ borderWidth: image.borderWidth,
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+ borderColor: image.borderColor,
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+ zIndex: typeof zIndex !== undefined ? zIndex : index,
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+ imgPath,
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+ sx,
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+ sy,
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+ sw: (width - (sx * 2)),
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+ sh: (height - (sy * 2)),
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+ x,
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+ y,
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+ w: setWidth,
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+ h: setHeight,
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+ });
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+ resolve();
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+ })
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+ .catch(err => reject(err));
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+ });
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+ },
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+ /**
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+ * 下载图片资源
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+ * @param {*} imageUrl
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+ */
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+ _downImage(imageUrl) {
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+ return new Promise((resolve, reject) => {
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+ if (/^http/.test(imageUrl) && !new RegExp(wx.env.USER_DATA_PATH).test(imageUrl)) {
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+ wx.downloadFile({
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+ url: this._mapHttpToHttps(imageUrl),
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+ success: (res) => {
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+ if (res.statusCode === 200) {
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+ resolve(res.tempFilePath);
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+ } else {
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+ reject(res.errMsg);
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+ }
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+ },
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+ fail(err) {
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+ reject(err);
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+ },
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+ });
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+ } else {
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+ // 支持本地地址
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+ resolve(imageUrl);
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+ }
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+ });
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+ },
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+ /**
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+ * 获取图片信息
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+ * @param {*} imgPath
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+ * @param {*} index
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+ */
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+ _getImageInfo(imgPath, index) {
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+ return new Promise((resolve, reject) => {
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+ wx.getImageInfo({
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+ src: imgPath,
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+ success(res) {
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+ resolve({ imgPath, imgInfo: res, index });
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+ },
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+ fail(err) {
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+ reject(err);
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+ },
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+ });
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+ });
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+ },
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+ toPx(rpx, int) {
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+ if (int) {
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+ return parseInt(rpx * this.factor * this.pixelRatio);
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+ }
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+ return rpx * this.factor * this.pixelRatio;
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+
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+ },
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+ toRpx(px, int) {
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+ if (int) {
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+ return parseInt(px / this.factor);
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+ }
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+ return px / this.factor;
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+ },
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+ /**
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+ * 将http转为https
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+ * @param {String}} rawUrl 图片资源url
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+ */
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+ _mapHttpToHttps(rawUrl) {
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+ if (rawUrl.indexOf(':') < 0) {
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+ return rawUrl;
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+ }
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+ const urlComponent = rawUrl.split(':');
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+ if (urlComponent.length === 2) {
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+ if (urlComponent[0] === 'http') {
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+ urlComponent[0] = 'https';
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+ return `${urlComponent[0]}:${urlComponent[1]}`;
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+ }
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+ }
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+ return rawUrl;
|
|
|
+ },
|
|
|
+}
|
|
|
+Component({
|
|
|
+ properties: {
|
|
|
+ },
|
|
|
+ created() {
|
|
|
+ const sysInfo = wx.getSystemInfoSync();
|
|
|
+ const screenWidth = sysInfo.screenWidth;
|
|
|
+ this.factor = screenWidth / 750;
|
|
|
+ },
|
|
|
+ methods: Object.assign({
|
|
|
+ /**
|
|
|
+ * 计算画布的高度
|
|
|
+ * @param {*} config
|
|
|
+ */
|
|
|
+ getHeight(config) {
|
|
|
+ const getTextHeight = (text) => {
|
|
|
+ let fontHeight = text.lineHeight || text.fontSize;
|
|
|
+ let height = 0;
|
|
|
+ if (text.baseLine === 'top') {
|
|
|
+ height = fontHeight;
|
|
|
+ } else if (text.baseLine === 'middle') {
|
|
|
+ height = fontHeight / 2;
|
|
|
+ } else {
|
|
|
+ height = 0;
|
|
|
+ }
|
|
|
+ return height;
|
|
|
+ }
|
|
|
+ const heightArr = [];
|
|
|
+ (config.blocks || []).forEach((item) => {
|
|
|
+ heightArr.push(item.y + item.height);
|
|
|
+ });
|
|
|
+ (config.texts || []).forEach((item) => {
|
|
|
+ let height;
|
|
|
+ if (Object.prototype.toString.call(item.text) === '[object Array]') {
|
|
|
+ item.text.forEach((i) => {
|
|
|
+ height = getTextHeight({...i, baseLine: item.baseLine});
|
|
|
+ heightArr.push(item.y + height);
|
|
|
+ });
|
|
|
+ } else {
|
|
|
+ height = getTextHeight(item);
|
|
|
+ heightArr.push(item.y + height);
|
|
|
+ }
|
|
|
+ });
|
|
|
+ (config.images || []).forEach((item) => {
|
|
|
+ heightArr.push(item.y + item.height);
|
|
|
+ });
|
|
|
+ (config.lines || []).forEach((item) => {
|
|
|
+ heightArr.push(item.startY);
|
|
|
+ heightArr.push(item.endY);
|
|
|
+ });
|
|
|
+ const sortRes = heightArr.sort((a, b) => b - a);
|
|
|
+ let canvasHeight = 0;
|
|
|
+ if (sortRes.length > 0) {
|
|
|
+ canvasHeight = sortRes[0];
|
|
|
+ }
|
|
|
+ if (config.height < canvasHeight || !config.height) {
|
|
|
+ return canvasHeight;
|
|
|
+ } else {
|
|
|
+ return config.height;
|
|
|
+ }
|
|
|
+ },
|
|
|
+ create(config) {
|
|
|
+ this.ctx = wx.createCanvasContext('canvasid', this);
|
|
|
+
|
|
|
+ this.pixelRatio = config.pixelRatio || 1;
|
|
|
+ const height = this.getHeight(config);
|
|
|
+ this.initCanvas(config.width, height, config.debug)
|
|
|
+ .then(() => {
|
|
|
+ // 设置画布底色
|
|
|
+ if (config.backgroundColor) {
|
|
|
+ this.ctx.save();
|
|
|
+ this.ctx.setFillStyle(config.backgroundColor);
|
|
|
+ this.ctx.fillRect(0, 0, this.toPx(config.width), this.toPx(height));
|
|
|
+ this.ctx.restore();
|
|
|
+ }
|
|
|
+ const { texts = [], images = [], blocks = [], lines = [] } = config;
|
|
|
+ const queue = this.drawArr
|
|
|
+ .concat(texts.map((item) => {
|
|
|
+ item.type = 'text';
|
|
|
+ item.zIndex = item.zIndex || 0;
|
|
|
+ return item;
|
|
|
+ }))
|
|
|
+ .concat(blocks.map((item) => {
|
|
|
+ item.type = 'block';
|
|
|
+ item.zIndex = item.zIndex || 0;
|
|
|
+ return item;
|
|
|
+ }))
|
|
|
+ .concat(lines.map((item) => {
|
|
|
+ item.type = 'line';
|
|
|
+ item.zIndex = item.zIndex || 0;
|
|
|
+ return item;
|
|
|
+ }));
|
|
|
+ // 按照顺序排序
|
|
|
+ queue.sort((a, b) => a.zIndex - b.zIndex);
|
|
|
+
|
|
|
+ queue.forEach((item) => {
|
|
|
+ if (item.type === 'image') {
|
|
|
+ this.drawImage(item)
|
|
|
+ } else if (item.type === 'text') {
|
|
|
+ this.drawText(item)
|
|
|
+ } else if (item.type === 'block') {
|
|
|
+ this.drawBlock(item)
|
|
|
+ } else if (item.type === 'line') {
|
|
|
+ this.drawLine(item)
|
|
|
+ }
|
|
|
+ });
|
|
|
+
|
|
|
+ const res = wx.getSystemInfoSync();
|
|
|
+ const platform = res.platform;
|
|
|
+ let time = 0;
|
|
|
+ if (platform === 'android') {
|
|
|
+ // 在安卓平台,经测试发现如果海报过于复杂在转换时需要做延时,要不然样式会错乱
|
|
|
+ time = 300;
|
|
|
+ }
|
|
|
+ this.ctx.draw(false, () => {
|
|
|
+ setTimeout(() => {
|
|
|
+ wx.canvasToTempFilePath({
|
|
|
+ canvasId: 'canvasid',
|
|
|
+ success: (res) => {
|
|
|
+ this.triggerEvent('success', res.tempFilePath);
|
|
|
+ },
|
|
|
+ fail: (err) => {
|
|
|
+ this.triggerEvent('fail', err);
|
|
|
+ },
|
|
|
+ }, this);
|
|
|
+ }, time);
|
|
|
+ });
|
|
|
+ })
|
|
|
+ .catch((err) => {
|
|
|
+ wx.showToast({ icon: 'none', title: err.errMsg || '生成失败' });
|
|
|
+ console.error(err);
|
|
|
+ });
|
|
|
+ },
|
|
|
+ }, main, handle, helper),
|
|
|
+});
|
|
|
+
|