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ofxVoronoiGL.cpp
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ofxVoronoiGL.cpp
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#include "ofxVoronoiGL.h"
void ofxVoronoiGL::setup(int _width, int _height, float _error){
width = _width;
height = _height;
error = _error;
fbo.allocate(width,height,GL_RGB,1);
R = sqrt(width*width + height*height);
//TODO musst be calculate by 2cos⁽⁻¹⁾(R-E / R)
alpha = 3;
steps = (int)(360.f / alpha)+1;
alphaUse = 360.f / (float)steps;
cam.enableOrtho();
}
void ofxVoronoiGL::update(){
// fbo.clear();//TODO hier stand ma clear
fbo.begin();
cam.begin();
createVoronoi();
cam.end();
fbo.end();
}
void ofxVoronoiGL::setPoint(int x,int y){
points.push_back(ofxVoronoiCell(x,y,SPTAColor()));
}
void ofxVoronoiGL::setPoint(ofPoint & p){
setPoint(p.x,p.y);
}
void ofxVoronoiGL::setPolygon(std::vector<ofPoint> & points){
std::vector<ofxVoronoiCell> cells;
std::vector<ofPoint>::iterator pointIt;
for(pointIt = points.begin(); pointIt != points.end();pointIt++){
ofPoint & p = *pointIt;
cells.push_back(ofxVoronoiCell(p.x,p.y,SPTAColor()));
}
polygons.push_back(cells);
}
void ofxVoronoiGL::drawOnScreen(int x,int y){
ofPushMatrix();
ofTranslate(x,y);
createVoronoi();
ofPopMatrix();
}
void ofxVoronoiGL::createVoronoi(){
glEnable(GL_DEPTH_TEST);
glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
//draw points
std::vector<ofxVoronoiCell>::iterator pointIt;
for(pointIt = points.begin(); pointIt!=points.end();pointIt++){
ofxVoronoiCell& p = *pointIt;
drawCone(p,p.color);
}
//draw polygons
std::vector<std::vector<ofxVoronoiCell> >::iterator polyIt;
for(polyIt = polygons.begin();polyIt!=polygons.end();polyIt++){
std::vector<ofxVoronoiCell>& poly = *polyIt;
drawPolygon(poly);
}
glDisable(GL_DEPTH_TEST); //REVISIT instead of enable and disable -> popStyle
}
void ofxVoronoiGL::drawCone(int peakX, int peakY, ofColor &color){
ofSetColor(color.r,color.g,color.b);
glPushMatrix();
glTranslatef(peakX, peakY, 0);
glBegin(GL_TRIANGLES);
for(int i=0;i<steps;i++){
glVertex3f(0,0,0);
float x = R * sin(alphaUse*i*PI/180);
float y = R * cos(alphaUse*i*PI/180);
glVertex3f(x,y,-R);
x = R * sin(alphaUse*(i+1)*PI/180);
y = R * cos(alphaUse*(i+1)*PI/180);
glVertex3f(x,y,-R);
}
glEnd();
if(drawCenters){
ofFill();
ofSetColor(0,0,0);
ofEllipse(0,0,5,5);
}
glPopMatrix();
}
void ofxVoronoiGL::drawPolygon(std::vector<ofxVoronoiCell> & poly){
std::vector<ofxVoronoiCell>::iterator pointIt;
std::vector<ofxVoronoiCell>::iterator pointIt2;
std::vector<ofxVoronoiCell>::iterator pointIt3;
//spezial cases
if(poly.size()<3){
if(poly.size() == 1){
pointIt = poly.begin();
ofxVoronoiCell& p = *pointIt;
drawCone(p,p.color);
}else if(poly.size() == 2){
pointIt = poly.begin();
pointIt2 = poly.begin();
ofxVoronoiCell& p1 = *pointIt;
ofxVoronoiCell& p2 = *pointIt2;
drawCone(p1,p1.color);
drawCone(p2,p1.color);
drawTent(p1,p2,p1.color);
}
}
pointIt = poly.begin();
pointIt2 = poly.begin();
pointIt3 = poly.begin();
pointIt2++;
pointIt3++;
pointIt3++;
SPTAColor color = (*pointIt).color;
bool end = false;
while(!end){
//for(; pointIt3 != poly.end();pointIt++,pointIt2++,pointIt3++){
if(pointIt3 == poly.end()){
pointIt3 = poly.begin();
}else if(pointIt2 == poly.end()){
pointIt2 = poly.begin();
end = true;
}
ofxVoronoiCell& p1 = *pointIt;
ofxVoronoiCell& p2 = *pointIt2;
ofxVoronoiCell& p3 = *pointIt3;
ofVec2f v1 = ofVec2f(p1.x-p2.x,p1.y-p2.y);
ofVec2f v2 = ofVec2f(p2.x-p3.x,p2.y-p3.y);
SPTAColor colorCone = color;
if(skeleton){
if(v1.angle(v2)<0){
colorCone.set(0,0,0);
color = p2.color;
}
}else if(perFeatureV){
colorCone = p2.color;
}
drawCone(p2,colorCone);
drawTent(p2,p3,color);
pointIt++,pointIt2++,pointIt3++;
}
}
void ofxVoronoiGL::drawTent(ofxVoronoiCell p1, ofxVoronoiCell p2, ofColor &color){
//vector between p1 and p2 => p1-p2
ofPoint p1p2 = ofPoint(p1.x-p2.x,p1.y-p2.y);
ofVec2f norm1 = ofVec2f(-p1p2.y,p1p2.x);
ofVec2f norm2 = ofVec2f(p1p2.y,-p1p2.x);
norm1.normalize();
norm2.normalize();
norm1 *= R;
norm2 *= R;
ofPoint pn1 = norm1;
ofPoint pn2 = norm2;
if(perFeatureV){
ofSetColor(255-p1.color.r,255-p1.color.g,255-p1.color.b);
}else{
ofSetColor(color.r,color.g,color.b);
}
glBegin(GL_QUADS);
glVertex3f(p1.x,p1.y,0);
glVertex3f(p2.x,p2.y,0);
glVertex3f(p2.x + pn1.x ,p2.y + pn1.y ,-R);
glVertex3f(p1.x + pn1.x ,p1.y + pn1.y ,-R);
glEnd();
if(skeleton){
ofSetColor(0,0,0);
}
glBegin(GL_QUADS);
glVertex3f(p1.x,p1.y,0);
glVertex3f(p2.x,p2.y,0);
glVertex3f(p2.x + pn2.x ,p2.y + pn2.y ,-R);
glVertex3f(p1.x + pn2.x ,p1.y + pn2.y ,-R);
glEnd();
if(drawCenters){
ofSetColor(0,0,0);
ofLine(p1.x,p1.y,p2.x,p2.y);
}
}