CanvasPattern:setTransform() 方法

备注: 此特性在 Web Worker 中可用。

setTransform(matrix)

<canvas id="canvas"></canvas>

const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
const matrix = new DOMMatrix([1, 0.2, 0.8, 1, 0, 0]);
const img = new Image();
img.src = "canvas_createpattern.png";
img.onload = () => {
 const pattern = ctx.createPattern(img, "repeat");
 pattern.setTransform(matrix.rotate(-45).scale(1.5));
 ctx.fillStyle = pattern;
 ctx.fillRect(0, 0, 400, 400);
};

<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
<div class="playable-buttons">
 <input id="edit" type="button" value="Edit" />
 <input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code" style="height:120px">
const img = new Image();
img.src = 'canvas_createpattern.png';
img.onload = () => {
 const pattern = ctx.createPattern(img, 'repeat');
 pattern.setTransform(matrix.rotate(-45).scale(1.5));
 ctx.fillStyle = pattern;
 ctx.fillRect(0, 0, 400, 400);
};
</textarea>

const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
const textarea = document.getElementById("code");
const reset = document.getElementById("reset");
const edit = document.getElementById("edit");
const code = textarea.value;
const matrix = new DOMMatrix([1, 0.2, 0.8, 1, 0, 0]);
function drawCanvas() {
 ctx.clearRect(0, 0, canvas.width, canvas.height);
 eval(textarea.value);
}
reset.addEventListener("click", () => {
 textarea.value = code;
 drawCanvas();
});
edit.addEventListener("click", () => {
 textarea.focus();
});
textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);

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此页面最后更新于 2024年7月13日,由 MDN 贡献者更新。