add missing file

src/tools/segment-brush-helper.js

@@ -0,0 +1,59 @@
+// Applies segment brush functions to the tool
+pg.segmentbrushhelper = function(tool, options) {
+	var lastPoint, finalPath;
+
+	tool.onSegmentMouseDown = function(event) {
+		tool.minDistance = options.brushSize/4;
+		tool.maxDistance = options.brushSize;
+		
+		finalPath = new Path.Circle({
+		    center: event.point,
+		    radius: options.brushSize/2
+		});
+		tool.stylePath(finalPath);
+		lastPoint = event.point;
+	};
+	
+	tool.onSegmentMouseDrag = function(event) {
+		var step = (event.delta).normalize(options.brushSize/2);
+		var handleVec = step.clone();
+		handleVec.length = options.brushSize/2;
+		handleVec.angle += 90;
+
+		var path = new Path();
+		path = pg.stylebar.applyActiveToolbarStyle(path);
+		path.strokeColor = null;
+		// Add handles to round the end caps
+		path.add(new Segment(lastPoint - step, -handleVec, handleVec));
+		step.angle += 90;
+
+		path.add(event.lastPoint + step);
+		path.insert(0, event.lastPoint - step);
+		path.add(event.point + step);
+		path.insert(0, event.point - step);
+
+		// Add end cap
+		step.angle -= 90;
+		path.add(new Segment(event.point + step, handleVec, -handleVec));
+		path.closed = true;
+		// The unite function on curved paths does not always work (sometimes deletes half the path)
+		// so we have to flatten.
+		path.flatten(options.brushSize/5);
+		
+		lastPoint = event.point;
+		var newPath = finalPath.unite(path);
+		path.remove();
+		finalPath.remove();
+		finalPath = newPath;
+	};
+
+	tool.onSegmentMouseUp = function(event) {
+		// TODO: This smoothing tends to cut off large portions of the path! Would like to eventually
+		// add back smoothing, maybe a custom implementation that only applies to a subset of the line?
+
+		// Smooth the path.
+		finalPath.simplify(2);
+		//console.log(finalPath.segments);
+		return finalPath;
+	};
+}