@tldraw/editor
Version:
tldraw infinite canvas SDK (editor).
83 lines (82 loc) • 2.06 kB
JavaScript
function getPerfectDashProps(totalLength, strokeWidth, opts = {}) {
const {
closed = false,
snap = 1,
start = "outset",
end = "outset",
lengthRatio = 2,
style = "dashed",
forceSolid = false
} = opts;
let dashLength = 0;
let dashCount = 0;
let ratio = 1;
let gapLength = 0;
let strokeDashoffset = 0;
if (forceSolid) {
return {
strokeDasharray: "none",
strokeDashoffset: "none"
};
}
switch (style) {
case "dashed": {
ratio = 1;
dashLength = Math.min(strokeWidth * lengthRatio, totalLength / 4);
break;
}
case "dotted": {
ratio = 100;
dashLength = strokeWidth / ratio;
break;
}
default: {
return {
strokeDasharray: "none",
strokeDashoffset: "none"
};
}
}
if (!closed) {
if (start === "outset") {
totalLength += dashLength / 2;
strokeDashoffset += dashLength / 2;
} else if (start === "skip") {
totalLength -= dashLength;
strokeDashoffset -= dashLength;
}
if (end === "outset") {
totalLength += dashLength / 2;
} else if (end === "skip") {
totalLength -= dashLength;
}
}
dashCount = Math.floor(totalLength / dashLength / (2 * ratio));
dashCount -= dashCount % snap;
if (dashCount < 3 && style === "dashed") {
if (totalLength / strokeWidth < 4) {
dashLength = totalLength;
dashCount = 1;
gapLength = 0;
} else {
dashLength = totalLength * (1 / 3);
gapLength = totalLength * (1 / 3);
}
} else {
dashLength = totalLength / dashCount / (2 * ratio);
if (closed) {
strokeDashoffset = dashLength / 2;
gapLength = (totalLength - dashCount * dashLength) / dashCount;
} else {
gapLength = (totalLength - dashCount * dashLength) / Math.max(1, dashCount - 1);
}
}
return {
strokeDasharray: [dashLength, gapLength].join(" "),
strokeDashoffset: strokeDashoffset.toString()
};
}
export {
getPerfectDashProps
};
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