28 lines
1.0 KiB
JavaScript
28 lines
1.0 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.watermark = void 0;
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const x6_geometry_1 = require("@antv/x6-geometry");
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const watermark = function (img, options) {
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const width = img.width;
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const height = img.height;
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const canvas = document.createElement('canvas');
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canvas.width = width * 3;
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canvas.height = height * 3;
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const ctx = canvas.getContext('2d');
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const angle = options.angle != null ? -options.angle : -20;
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const radians = x6_geometry_1.Angle.toRad(angle);
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const stepX = canvas.width / 4;
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const stepY = canvas.height / 4;
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for (let i = 0; i < 4; i += 1) {
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for (let j = 0; j < 4; j += 1) {
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if ((i + j) % 2 > 0) {
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ctx.setTransform(1, 0, 0, 1, (2 * i - 1) * stepX, (2 * j - 1) * stepY);
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ctx.rotate(radians);
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ctx.drawImage(img, -width / 2, -height / 2, width, height);
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}
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}
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}
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return canvas;
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};
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exports.watermark = watermark;
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//# sourceMappingURL=watermark.js.map
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