| 1 | import { SVGPathData } from "./SVGPathData";
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| 2 | import { SVGCommand } from "./types";
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| 3 |
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| 4 | // Encode SVG PathData
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| 5 | // http://www.w3.org/TR/SVG/paths.html#PathDataBNF
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| 6 |
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| 7 | // Private consts : Char groups
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| 8 | const WSP = " ";
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| 9 |
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| 10 | export function encodeSVGPath(commands: SVGCommand | SVGCommand[]) {
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| 11 | let str = "";
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| 12 |
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| 13 | if (!Array.isArray(commands)) {
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| 14 | commands = [commands];
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| 15 | }
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| 16 | for (let i = 0; i < commands.length; i++) {
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| 17 | const command = commands[i];
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| 18 | if (command.type === SVGPathData.CLOSE_PATH) {
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| 19 | str += "z";
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| 20 | } else if (command.type === SVGPathData.HORIZ_LINE_TO) {
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| 21 | str += (command.relative ? "h" : "H") +
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| 22 | command.x;
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| 23 | } else if (command.type === SVGPathData.VERT_LINE_TO) {
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| 24 | str += (command.relative ? "v" : "V") +
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| 25 | command.y;
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| 26 | } else if (command.type === SVGPathData.MOVE_TO) {
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| 27 | str += (command.relative ? "m" : "M") +
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| 28 | command.x + WSP + command.y;
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| 29 | } else if (command.type === SVGPathData.LINE_TO) {
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| 30 | str += (command.relative ? "l" : "L") +
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| 31 | command.x + WSP + command.y;
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| 32 | } else if (command.type === SVGPathData.CURVE_TO) {
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| 33 | str += (command.relative ? "c" : "C") +
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| 34 | command.x1 + WSP + command.y1 +
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| 35 | WSP + command.x2 + WSP + command.y2 +
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| 36 | WSP + command.x + WSP + command.y;
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| 37 | } else if (command.type === SVGPathData.SMOOTH_CURVE_TO) {
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| 38 | str += (command.relative ? "s" : "S") +
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| 39 | command.x2 + WSP + command.y2 +
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| 40 | WSP + command.x + WSP + command.y;
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| 41 | } else if (command.type === SVGPathData.QUAD_TO) {
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| 42 | str += (command.relative ? "q" : "Q") +
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| 43 | command.x1 + WSP + command.y1 +
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| 44 | WSP + command.x + WSP + command.y;
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| 45 | } else if (command.type === SVGPathData.SMOOTH_QUAD_TO) {
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| 46 | str += (command.relative ? "t" : "T") +
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| 47 | command.x + WSP + command.y;
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| 48 | } else if (command.type === SVGPathData.ARC) {
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| 49 | str += (command.relative ? "a" : "A") +
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| 50 | command.rX + WSP + command.rY +
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| 51 | WSP + command.xRot +
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| 52 | WSP + (+command.lArcFlag) + WSP + (+command.sweepFlag) +
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| 53 | WSP + command.x + WSP + command.y;
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| 54 | } else {
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| 55 | // Unknown command
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| 56 | throw new Error(
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| 57 | `Unexpected command type "${ (command as any).type}" at index ${i}.`);
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | return str;
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| 62 | }
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