Test app for issue https://github.com/openframeworks/openFrameworks/issues/5288

main.cpp

#include "ofMain.h"

ofPolyline polyline;
uint64_t pointFlags = -1;


class ofApp : public ofBaseApp
{

public:
	
	void reset(){
		
		polyline.addVertex( 100, 200, 0 );
		polyline.addVertex( 100, 200, 0 );
		polyline.addVertex( 50, 377, 0 );
		polyline.addVertex( 762, 300, 0 );
		polyline.addVertex( 400, 100, 0 );
		polyline.addVertex( 762, 300, 0 );

		for ( std::size_t i = 0; i < polyline.size(); ++i ){
			ofLog() << "Pos     " << i << " : " << polyline[i];
			ofVec3f tangentPoint = polyline.getTangentAtIndex( i );
			ofLog() << "Tangent " << i << " : " << tangentPoint << " / " << tangentPoint.getNormalized();
			ofVec3f normalPoint = polyline.getNormalAtIndex( i );
			ofLog() << "Normal  " << i << " : " << normalPoint << " / " << normalPoint.getNormalized();
			ofLog() << "Angle   " << i << " : " << polyline.getAngleAtIndex( i );
			ofLog() << std::endl;
		}
		uint64_t pointFlags = -1;
	}

	void setup(){
		reset();
	};
	
	void draw(){
		ofSetBackgroundColor( ofColor::black );
		ofSetColor( ofColor::blue );
		polyline.draw();


		for ( std::size_t i = 0; i < polyline.size(); ++i ){
			if ( ( 1 << (i % 10) ) & pointFlags ){
				auto & p = polyline[i];
				ofSetColor( ofColor::white );
				ofDrawBitmapString( ofToString( i ), p );

				ofSetColor( ofColor::green );
				ofVec3f t = polyline.getTangentAtIndex( i );
				ofDrawLine( p, p + t * 30 );

				ofSetColor( ofColor::red );
				ofVec3f n = polyline.getNormalAtIndex( i );
				ofDrawLine( p, p + n * 30 );
			}
		}

		ostringstream text;
		text << "test #5228 / shortcuts: " << endl;
		text << "0-9: toggle point info drawing for vertex" << endl;
		text << "a,n: toggle point info for all/none" << endl;
		text << "+,-: resample by count (add/remove 4 vertices)" << endl;
		text << "r/R: reset to start screen / create random elements" << endl;

		ofDrawBitmapStringHighlight( text.str(), 20, ofGetHeight() - 16 * 5 );

	};

	void keyReleased( int key ){
		if ( key >= '0' && key <= '9' ){
			uint64_t keyInt = key - '0';
			ofLog() << "Toggle point: " << ( '0' + keyInt );
			pointFlags ^= ( 1ULL << keyInt );
		} else if ( key == 'a' ){
			pointFlags = -1;
		} else if ( key == 'n' ){
			pointFlags = 0;
		} else if ( key == '+' ){
			polyline = polyline.getResampledByCount( polyline.size() + 4 );
		} else if ( key == '-' ){
			polyline = polyline.getResampledByCount( std::max<int>( 0, int( polyline.size() ) - 4 ) );
		} else if ( key == 'r' ){
			reset();
		} else if ( key == 'R' ){
			for ( auto&p : polyline ){
				p = ofVec3f( ofRandomWidth(), ofRandomHeight(),0 );
			}
		}
	};
	

};


//========================================================================
int main( ){
	ofSetupOpenGL(1024,768,OF_WINDOW);			// <-------- setup the GL context

	// this kicks off the running of my app
	// can be OF_WINDOW or OF_FULLSCREEN
	// pass in width and height too:
	ofRunApp(new ofApp());

}