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import { SVGPathData } from "./SVGPathData";
import { SVGCommand } from "./types";
// Encode SVG PathData
// http://www.w3.org/TR/SVG/paths.html#PathDataBNF
// Private consts : Char groups
const WSP = " ";
export function encodeSVGPath(commands: SVGCommand | SVGCommand[]) {
let str = "";
if (!Array.isArray(commands)) {
commands = [commands];
}
for (let i = 0; i < commands.length; i++) {
const command = commands[i];
if (command.type === SVGPathData.CLOSE_PATH) {
str += "z";
} else if (command.type === SVGPathData.HORIZ_LINE_TO) {
str += (command.relative ? "h" : "H") +
command.x;
} else if (command.type === SVGPathData.VERT_LINE_TO) {
str += (command.relative ? "v" : "V") +
command.y;
} else if (command.type === SVGPathData.MOVE_TO) {
str += (command.relative ? "m" : "M") +
command.x + WSP + command.y;
} else if (command.type === SVGPathData.LINE_TO) {
str += (command.relative ? "l" : "L") +
command.x + WSP + command.y;
} else if (command.type === SVGPathData.CURVE_TO) {
str += (command.relative ? "c" : "C") +
command.x1 + WSP + command.y1 +
WSP + command.x2 + WSP + command.y2 +
WSP + command.x + WSP + command.y;
} else if (command.type === SVGPathData.SMOOTH_CURVE_TO) {
str += (command.relative ? "s" : "S") +
command.x2 + WSP + command.y2 +
WSP + command.x + WSP + command.y;
} else if (command.type === SVGPathData.QUAD_TO) {
str += (command.relative ? "q" : "Q") +
command.x1 + WSP + command.y1 +
WSP + command.x + WSP + command.y;
} else if (command.type === SVGPathData.SMOOTH_QUAD_TO) {
str += (command.relative ? "t" : "T") +
command.x + WSP + command.y;
} else if (command.type === SVGPathData.ARC) {
str += (command.relative ? "a" : "A") +
command.rX + WSP + command.rY +
WSP + command.xRot +
WSP + (+command.lArcFlag) + WSP + (+command.sweepFlag) +
WSP + command.x + WSP + command.y;
} else {
// Unknown command
throw new Error(
`Unexpected command type "${ (command as any).type}" at index ${i}.`);
}
}
return str;
}
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