101 lines
3.6 KiB
JavaScript
101 lines
3.6 KiB
JavaScript
import { isArray } from '@vue/shared';
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const FontGap = 3;
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const TEXT_ALIGN_RATIO_MAP = {
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left: [0, 0.5],
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start: [0, 0.5],
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center: [0.5, 0],
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right: [1, -0.5],
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end: [1, -0.5]
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};
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function prepareCanvas(width, height, ratio = 1) {
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const canvas = document.createElement("canvas");
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const ctx = canvas.getContext("2d");
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const realWidth = width * ratio;
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const realHeight = height * ratio;
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canvas.setAttribute("width", `${realWidth}px`);
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canvas.setAttribute("height", `${realHeight}px`);
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ctx.save();
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return [ctx, canvas, realWidth, realHeight];
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}
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function useClips() {
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function getClips(content, rotate, ratio, width, height, font, gapX, gapY, space) {
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const [ctx, canvas, contentWidth, contentHeight] = prepareCanvas(width, height, ratio);
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if (content instanceof HTMLImageElement) {
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ctx.drawImage(content, 0, 0, contentWidth, contentHeight);
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} else {
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const {
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color,
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fontSize,
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fontStyle,
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fontWeight,
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fontFamily,
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textAlign,
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textBaseline
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} = font;
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const mergedFontSize = Number(fontSize) * ratio;
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ctx.font = `${fontStyle} normal ${fontWeight} ${mergedFontSize}px/${height}px ${fontFamily}`;
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ctx.fillStyle = color;
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ctx.textAlign = textAlign;
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ctx.textBaseline = textBaseline;
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const contents = isArray(content) ? content : [content];
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contents == null ? void 0 : contents.forEach((item, index) => {
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const [alignRatio, spaceRatio] = TEXT_ALIGN_RATIO_MAP[textAlign];
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ctx.fillText(item != null ? item : "", contentWidth * alignRatio + space * spaceRatio, index * (mergedFontSize + FontGap * ratio));
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});
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}
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const angle = Math.PI / 180 * Number(rotate);
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const maxSize = Math.max(width, height);
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const [rCtx, rCanvas, realMaxSize] = prepareCanvas(maxSize, maxSize, ratio);
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rCtx.translate(realMaxSize / 2, realMaxSize / 2);
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rCtx.rotate(angle);
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if (contentWidth > 0 && contentHeight > 0) {
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rCtx.drawImage(canvas, -contentWidth / 2, -contentHeight / 2);
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}
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function getRotatePos(x, y) {
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const targetX = x * Math.cos(angle) - y * Math.sin(angle);
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const targetY = x * Math.sin(angle) + y * Math.cos(angle);
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return [targetX, targetY];
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}
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let left = 0;
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let right = 0;
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let top = 0;
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let bottom = 0;
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const halfWidth = contentWidth / 2;
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const halfHeight = contentHeight / 2;
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const points = [
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[0 - halfWidth, 0 - halfHeight],
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[0 + halfWidth, 0 - halfHeight],
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[0 + halfWidth, 0 + halfHeight],
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[0 - halfWidth, 0 + halfHeight]
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];
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points.forEach(([x, y]) => {
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const [targetX, targetY] = getRotatePos(x, y);
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left = Math.min(left, targetX);
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right = Math.max(right, targetX);
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top = Math.min(top, targetY);
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bottom = Math.max(bottom, targetY);
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});
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const cutLeft = left + realMaxSize / 2;
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const cutTop = top + realMaxSize / 2;
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const cutWidth = right - left;
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const cutHeight = bottom - top;
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const realGapX = gapX * ratio;
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const realGapY = gapY * ratio;
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const filledWidth = (cutWidth + realGapX) * 2;
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const filledHeight = cutHeight + realGapY;
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const [fCtx, fCanvas] = prepareCanvas(filledWidth, filledHeight);
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function drawImg(targetX = 0, targetY = 0) {
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fCtx.drawImage(rCanvas, cutLeft, cutTop, cutWidth, cutHeight, targetX, targetY, cutWidth, cutHeight);
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}
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drawImg();
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drawImg(cutWidth + realGapX, -cutHeight / 2 - realGapY / 2);
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drawImg(cutWidth + realGapX, +cutHeight / 2 + realGapY / 2);
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return [fCanvas.toDataURL(), filledWidth / ratio, filledHeight / ratio];
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}
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return getClips;
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}
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export { FontGap, useClips as default };
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//# sourceMappingURL=useClips.mjs.map
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