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roundRect.js
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/*
* Implements the .roundRect() method of the CanvasPath mixin
* as introduced by https://github.com/whatwg/html/pull/6765
*/
(() => {
"use strict";
Path2D.prototype.roundRect ??= roundRect;
if (globalThis.CanvasRenderingContext2D) {
globalThis.CanvasRenderingContext2D.prototype.roundRect ??= roundRect;
}
if (globalThis.OffscreenCanvasRenderingContext2D) {
globalThis.OffscreenCanvasRenderingContext2D.prototype.roundRect ??= roundRect;
}
function roundRect(x, y, w, h, radii) {
if (!([x, y, w, h].every((input) => Number.isFinite(input)))) {
return;
}
radii = parseRadiiArgument(radii);
let upperLeft, upperRight, lowerRight, lowerLeft;
if (radii.length === 4) {
upperLeft = toCornerPoint(radii[0]);
upperRight = toCornerPoint(radii[1]);
lowerRight = toCornerPoint(radii[2]);
lowerLeft = toCornerPoint(radii[3]);
} else if (radii.length === 3) {
upperLeft = toCornerPoint(radii[0]);
upperRight = toCornerPoint(radii[1]);
lowerLeft = toCornerPoint(radii[1]);
lowerRight = toCornerPoint(radii[2]);
} else if (radii.length === 2) {
upperLeft = toCornerPoint(radii[0]);
lowerRight = toCornerPoint(radii[0]);
upperRight = toCornerPoint(radii[1]);
lowerLeft = toCornerPoint(radii[1]);
} else if (radii.length === 1) {
upperLeft = toCornerPoint(radii[0]);
upperRight = toCornerPoint(radii[0]);
lowerRight = toCornerPoint(radii[0]);
lowerLeft = toCornerPoint(radii[0]);
} else {
throw new RangeError(`${ getErrorMessageHeader(this) } ${ radii.length } is not a valid size for radii sequence.`);
}
const corners = [upperLeft, upperRight, lowerRight, lowerLeft];
const negativeCorner = corners.find(({x, y}) => x < 0 || y < 0);
const negativeValue = negativeCorner?.x < 0 ? negativeCorner.x : negativeCorner?.y
if (corners.some(({x, y}) => !Number.isFinite(x) || !Number.isFinite(y))) {
return;
}
if (negativeCorner) {
throw new RangeError(`${ getErrorMessageHeader(this) } Radius value ${ negativeCorner } is negative.`);
}
fixOverlappingCorners(corners);
if (w < 0 && h < 0) {
this.moveTo(x - upperLeft.x, y);
this.ellipse(x + w + upperRight.x, y - upperRight.y, upperRight.x, upperRight.y, 0, -Math.PI * 1.5, -Math.PI);
this.ellipse(x + w + lowerRight.x, y + h + lowerRight.y, lowerRight.x, lowerRight.y, 0, -Math.PI, -Math.PI / 2);
this.ellipse(x - lowerLeft.x, y + h + lowerLeft.y, lowerLeft.x, lowerLeft.y, 0, -Math.PI / 2, 0);
this.ellipse(x - upperLeft.x, y - upperLeft.y, upperLeft.x, upperLeft.y, 0, 0, -Math.PI / 2);
} else if (w < 0) {
this.moveTo(x - upperLeft.x, y);
this.ellipse(x + w + upperRight.x, y + upperRight.y, upperRight.x, upperRight.y, 0, -Math.PI / 2, -Math.PI, 1);
this.ellipse(x + w + lowerRight.x, y + h - lowerRight.y, lowerRight.x, lowerRight.y, 0, -Math.PI, -Math.PI * 1.5, 1);
this.ellipse(x - lowerLeft.x, y + h - lowerLeft.y, lowerLeft.x, lowerLeft.y, 0, Math.PI / 2, 0, 1);
this.ellipse(x - upperLeft.x, y + upperLeft.y, upperLeft.x, upperLeft.y, 0, 0, -Math.PI / 2, 1);
} else if (h < 0) {
this.moveTo(x + upperLeft.x, y);
this.ellipse(x + w - upperRight.x, y - upperRight.y, upperRight.x, upperRight.y, 0, Math.PI / 2, 0, 1);
this.ellipse(x + w - lowerRight.x, y + h + lowerRight.y, lowerRight.x, lowerRight.y, 0, 0, -Math.PI / 2, 1);
this.ellipse(x + lowerLeft.x, y + h + lowerLeft.y, lowerLeft.x, lowerLeft.y, 0, -Math.PI / 2, -Math.PI, 1);
this.ellipse(x + upperLeft.x, y - upperLeft.y, upperLeft.x, upperLeft.y, 0, -Math.PI, -Math.PI * 1.5, 1);
} else {
this.moveTo(x + upperLeft.x, y);
this.ellipse(x + w - upperRight.x, y + upperRight.y, upperRight.x, upperRight.y, 0, -Math.PI / 2, 0);
this.ellipse(x + w - lowerRight.x, y + h - lowerRight.y, lowerRight.x, lowerRight.y, 0, 0, Math.PI / 2);
this.ellipse(x + lowerLeft.x, y + h - lowerLeft.y, lowerLeft.x, lowerLeft.y, 0, Math.PI / 2, Math.PI);
this.ellipse(x + upperLeft.x, y + upperLeft.y, upperLeft.x, upperLeft.y, 0, Math.PI, Math.PI * 1.5);
}
this.closePath();
this.moveTo(x, y);
function toDOMPointInit(value) {
const {x, y, z, w} = value;
return {x, y, z, w};
}
function parseRadiiArgument(value) {
// https://webidl.spec.whatwg.org/#es-union
// with 'optional (unrestricted double or DOMPointInit
// or sequence<(unrestricted double or DOMPointInit)>) radii = 0'
const type = typeof value;
if (type === "undefined" || value === null) {
return [0];
}
if (type === "function") {
return [NaN];
}
if (type === "object") {
if (typeof value[Symbol.iterator] === "function") {
return [...value].map((elem) => {
// https://webidl.spec.whatwg.org/#es-union
// with '(unrestricted double or DOMPointInit)'
const elemType = typeof elem;
if (elemType === "undefined" || elem === null) {
return 0;
}
if (elemType === "function") {
return NaN;
}
if (elemType === "object") {
return toDOMPointInit(elem);
}
return toUnrestrictedNumber(elem);
});
}
return [toDOMPointInit(value)];
}
return [toUnrestrictedNumber(value)];
}
function toUnrestrictedNumber(value) {
return +value;
}
function toCornerPoint(value) {
const asNumber = toUnrestrictedNumber(value);
if (Number.isFinite(asNumber)) {
return {
x: asNumber,
y: asNumber
};
}
if (Object(value) === value) {
return {
x: toUnrestrictedNumber(value.x ?? 0),
y: toUnrestrictedNumber(value.y ?? 0)
};
}
return {
x: NaN,
y: NaN
};
}
function fixOverlappingCorners(corners) {
const [upperLeft, upperRight, lowerRight, lowerLeft] = corners;
const factors = [
Math.abs(w) / (upperLeft.x + upperRight.x),
Math.abs(h) / (upperRight.y + lowerRight.y),
Math.abs(w) / (lowerRight.x + lowerLeft.x),
Math.abs(h) / (upperLeft.y + lowerLeft.y)
];
const minFactor = Math.min(...factors);
if (minFactor <= 1) {
for (const radii of corners) {
radii.x *= minFactor;
radii.y *= minFactor;
}
}
}
}
function getErrorMessageHeader(instance) {
return `Failed to execute 'roundRect' on '${ getConstructorName(instance) }':`;
}
function getConstructorName(instance) {
return Object(instance) === instance &&
instance instanceof Path2D ? "Path2D" :
instance instanceof globalThis?.CanvasRenderingContext2D ? "CanvasRenderingContext2D" :
instance instanceof globalThis?.OffscreenCanvasRenderingContext2D ? "OffscreenCanvasRenderingContext2D" :
instance?.constructor.name ||
instance;
}
})();