Current Dev State

static/js/ketcher2/node_modules/svg-pathdata/src/SVGPathDataEncoder.js

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+'use strict';
+
+// Encode SVG PathData
+// http://www.w3.org/TR/SVG/paths.html#PathDataBNF
+
+// Access to SVGPathData constructor
+var SVGPathData = require('./SVGPathData.js');
+
+// TransformStream inherance required modules
+var TransformStream = require('readable-stream').Transform;
+var util = require('util');
+
+// Private consts : Char groups
+var WSP = ' ';
+
+// Inherit of writeable stream
+util.inherits(SVGPathDataEncoder, TransformStream);
+
+// Constructor
+function SVGPathDataEncoder(options) {
+
+  // Ensure new were used
+  if(!(this instanceof SVGPathDataEncoder)) {
+    return new SVGPathDataEncoder(options);
+  }
+
+  // Parent constructor
+  TransformStream.call(this, {
+    objectMode: true,
+  });
+
+  // Setting objectMode separately
+  this._writableState.objectMode = true;
+  this._readableState.objectMode = false;
+
+}
+
+
+// Read method
+SVGPathDataEncoder.prototype._transform = function(commands, encoding, done) {
+  var str = '';
+  var i;
+  var j;
+
+  if(!(commands instanceof Array)) {
+    commands = [commands];
+  }
+  for(i = 0, j = commands.length; i < j; i++) {
+    // Horizontal move to command
+    if(commands[i].type === SVGPathData.CLOSE_PATH) {
+      str += 'z';
+      continue;
+    // Horizontal move to command
+    } else if(commands[i].type === SVGPathData.HORIZ_LINE_TO) {
+      str += (commands[i].relative ? 'h' : 'H') +
+        commands[i].x;
+    // Vertical move to command
+    } else if(commands[i].type === SVGPathData.VERT_LINE_TO) {
+      str += (commands[i].relative ? 'v' : 'V') +
+        commands[i].y;
+    // Move to command
+    } else if(commands[i].type === SVGPathData.MOVE_TO) {
+      str += (commands[i].relative ? 'm' : 'M') +
+        commands[i].x + WSP + commands[i].y;
+    // Line to command
+    } else if(commands[i].type === SVGPathData.LINE_TO) {
+      str += (commands[i].relative ? 'l' : 'L') +
+        commands[i].x + WSP + commands[i].y;
+    // Curve to command
+    } else if(commands[i].type === SVGPathData.CURVE_TO) {
+      str += (commands[i].relative ? 'c' : 'C') +
+        commands[i].x2 + WSP + commands[i].y2 +
+        WSP + commands[i].x1 + WSP + commands[i].y1 +
+        WSP + commands[i].x + WSP + commands[i].y;
+    // Smooth curve to command
+    } else if(commands[i].type === SVGPathData.SMOOTH_CURVE_TO) {
+      str += (commands[i].relative ? 's' : 'S') +
+        commands[i].x2 + WSP + commands[i].y2 +
+        WSP + commands[i].x + WSP + commands[i].y;
+    // Quadratic bezier curve to command
+    } else if(commands[i].type === SVGPathData.QUAD_TO) {
+      str += (commands[i].relative ? 'q' : 'Q') +
+        commands[i].x1 + WSP + commands[i].y1 +
+        WSP + commands[i].x + WSP + commands[i].y;
+    // Smooth quadratic bezier curve to command
+    } else if(commands[i].type === SVGPathData.SMOOTH_QUAD_TO) {
+      str += (commands[i].relative ? 't' : 'T') +
+        commands[i].x + WSP + commands[i].y;
+    // Elliptic arc command
+    } else if(commands[i].type === SVGPathData.ARC) {
+      str += (commands[i].relative ? 'a' : 'A') +
+        commands[i].rX + WSP + commands[i].rY +
+        WSP + commands[i].xRot +
+        WSP + commands[i].lArcFlag + WSP + commands[i].sweepFlag +
+        WSP + commands[i].x + WSP + commands[i].y;
+    // Unkown command
+    } else {
+      this.emit('error', new Error('Unexpected command type "' +
+        commands[i].type + '" at index ' + i + '.'));
+    }
+  }
+  this.push(new Buffer(str, 'utf8'));
+  done();
+};
+
+module.exports = SVGPathDataEncoder;