Stripped LineStrip Openframeworks

#include "ofApp.h"

// Note:
// You need ofxGui

ofPolyline		   resampled;
ofPolyline		   points;
ofParameter<float> resampleLength;
ofParameter<bool>  bDrawWireframe;
ofParameter<bool>  bDrawExtra;
ofParameter<float> width;
ofVboMesh		   mesh;


//--------------------------------------------------------------
void ofApp::setup() {
	
	ofBackgroundHex(0x82DBCE);
	ofSetFrameRate(60);
	
	gui.setup("app", "app.xml", 10, 10);
	gui.add(width.set("width", 25, 1, 150));
	gui.add(resampleLength.set("Re-sample length (px)", 33, 1, 50));
	gui.add(bDrawWireframe.set("Draw wireframe", false));
	gui.add(bDrawExtra.set("Draw extras", false));
	gui.loadFromFile("app.xml");
	
	mesh.setUsage(GL_STATIC_DRAW);
	mesh.setMode(OF_PRIMITIVE_TRIANGLES);
}


//--------------------------------------------------------------
void ofApp::draw() {
	
	ofVec2f mouse(ofGetMouseX(), ofGetMouseY());
	
	if (points.size() > 1) {

		resampled = points.getResampledBySpacing(resampleLength);
		mesh.clear();
		
		for (int i=1; i<resampled.size(); i++) {
			
			ofVec2f pt0	 = resampled[i-1];
			ofVec2f perp0 = resampled.getNormalAtIndex(i-1) * width;
			
			ofVec2f pt1	 = resampled[i];
			ofVec2f perp1 = resampled.getNormalAtIndex(i) * width;

			ofFloatColor color;
			if (i%2) {
				color.set(0.93, 0.79, 0.23, 1.00);
			} else {
				color.set(0.91, 0.27, 0.20, 1.00);
			}

			mesh.addVertex(pt0 - perp0); mesh.addColor(color);
			mesh.addVertex(pt0 + perp0); mesh.addColor(color);
			mesh.addVertex(pt1 - perp1); mesh.addColor(color);
			
			mesh.addVertex(pt1 - perp1); mesh.addColor(color);
			mesh.addVertex(pt1 + perp1); mesh.addColor(color);
			mesh.addVertex(pt0 + perp0); mesh.addColor(color);
			
		}
		
		mesh.draw();
		
		if (bDrawWireframe) {
			ofSetHexColor(0x202F3E);
			mesh.clearColors();
			mesh.drawWireframe();
		}
		
		// draw perps and points
		if (bDrawExtra) {
			for (int i=0; i<resampled.size(); i++) {
				
				ofVec2f pt = resampled[i];
				ofSetColor(255);
				ofDrawCircle(pt, 3);
				ofSetHexColor(0x202F3E);
				ofDrawCircle(pt, 1);
				
				ofVec2f perp = resampled.getNormalAtIndex(i) * width;
				ofSetColor(0, 50);
				ofDrawLine(pt - perp, pt + perp);
			}
		}
		
	}
	
	
	
	
	gui.draw();
	ofSetColor(0);
	ofDrawBitmapStringHighlight(ofToString(resampled.size()) + " pts\n"+ofToString(ofGetFrameRate(),0)+ " fps", ofGetWidth()-70, ofGetHeight()-20);
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key) {
	points.clear();
}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button) {
	points.addVertex(ofVec2f(x, y));
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button) {
	points.addVertex(ofVec2f(x, y));
}