SVGGeometryElement: isPointInStroke() 方法
Baseline 廣泛可用 *
SVGGeometryElement 介面的 isPointInStroke() 方法用於確定給定點是否位於元素的描邊形狀內。point 引數被解釋為元素區域性座標系中的一個點。
語法
js
isPointInStroke(point)
引數
point-
一個表示元素區域性座標系中點的物件。它使用與
DOMPoint.fromPoint()相同的演算法轉換為DOMPoint物件。
返回值
一個布林值，指示給定點是否在描邊內。
示例
SVG
html
<svg
viewBox="0 0 100 100"
width="150"
height="150"
xmlns="http://www.w3.org/2000/svg">
<circle
id="circle"
cx="50"
cy="50"
r="45"
fill="rgb(0 0 0 / 25%)"
stroke="rgb(0 0 0 / 50%)"
stroke-width="10" />
</svg>
JavaScript
js
const svg = document.getElementsByTagName("svg")[0];
const circle = document.getElementById("circle");
const points = [
[10, 10],
[40, 30],
[70, 40],
[15, 75],
[83, 83],
];
for (const point of points) {
let isPointInStroke;
try {
const pointObj = { x: point[0], y: point[1] };
isPointInStroke = circle.isPointInStroke(pointObj);
} catch {
// Fallback for browsers that don't support DOMPoint as an argument
const pointObj = svg.createSVGPoint();
pointObj.x = point[0];
pointObj.y = point[1];
isPointInStroke = circle.isPointInStroke(pointObj);
}
console.log(`Point at ${point[0]},${point[1]}: ${isPointInStroke}`);
const pointEl = document.createElementNS(
"http://www.w3.org/2000/svg",
"circle",
);
pointEl.cx.baseVal.value = point[0];
pointEl.cy.baseVal.value = point[1];
pointEl.r.baseVal.value = 5;
const pathEl = document.createElementNS("http://www.w3.org/2000/svg", "path");
if (isPointInStroke) {
pointEl.setAttribute("fill", "rgb(0 170 0 / 50%)");
pointEl.setAttribute("stroke", "rgb(0 170 0)");
pathEl.setAttribute("stroke", "rgb(0 170 0)");
pathEl.setAttribute("d", `M ${point[0] - 5} ${point[1]} h 10 m -5 -5 v 10`);
} else {
pointEl.setAttribute("fill", "rgb(170 0 0 / 50%)");
pointEl.setAttribute("stroke", "rgb(170 0 0)");
pathEl.setAttribute("stroke", "rgb(170 0 0)");
pathEl.setAttribute("d", `M ${point[0] - 5} ${point[1]} h 10`);
}
svg.append(pointEl, pathEl);
}
結果
規範
| 規範 |
|---|
| Scalable Vector Graphics (SVG) 2 # __svg__SVGGeometryElement__isPointInStroke |
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