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#include "ofMain.h" | |
#include "ofAppGlutWindow.h" | |
class testApp : public ofBaseApp { | |
public: | |
ofImage img; | |
ofPoint corners[4]; | |
int selectedCorner; | |
void setup() { | |
img.loadImage("testbeeld.png"); | |
ofSetWindowShape(img.width+60, img.height+60); | |
selectedCorner = -1; | |
//set corners | |
corners[0].set(0,0); | |
corners[1].set(img.width,0); | |
corners[2].set(img.width,img.height); | |
corners[3].set(0,img.height); | |
} | |
void draw() { | |
ofTranslate(30, 30); | |
ofxQuadWarp(img, corners[0], corners[1], corners[2], corners[3], 40, 40); | |
for (int i=0; i<4; i++) { | |
ofCircle(corners[i],10); | |
} | |
} | |
void mousePressed(int x, int y, int button) { | |
selectedCorner = -1; | |
for (int i=0; i<4; i++) { | |
if (ofDist(corners[i].x, corners[i].y, x-30, y-30)<10) { | |
selectedCorner = i; | |
} | |
} | |
} | |
void mouseDragged(int x, int y, int button) { | |
corners[selectedCorner].set(x-30,y-30); | |
} | |
void mouseReleased(int x, int y, int button) { | |
selectedCorner = -1; | |
} | |
ofPoint ofxLerp(ofPoint start, ofPoint end, float amt) { | |
return start + amt * (end - start); | |
} | |
int ofxIndex(float x, float y, float w) { | |
return y*w+x; | |
} | |
void ofxQuadWarp(ofBaseHasTexture &tex, ofPoint lt, ofPoint rt, ofPoint rb, ofPoint lb, int rows, int cols) { | |
float tw = tex.getTextureReference().getWidth(); | |
float th = tex.getTextureReference().getHeight(); | |
ofMesh mesh; | |
for (int x=0; x<=cols; x++) { | |
float f = float(x)/cols; | |
ofPoint vTop(ofxLerp(lt,rt,f)); | |
ofPoint vBottom(ofxLerp(lb,rb,f)); | |
ofPoint tTop(ofxLerp(ofPoint(0,0),ofPoint(tw,0),f)); | |
ofPoint tBottom(ofxLerp(ofPoint(0,th),ofPoint(tw,th),f)); | |
for (int y=0; y<=rows; y++) { | |
float f = float(y)/rows; | |
ofPoint v = ofxLerp(vTop,vBottom,f); | |
mesh.addVertex(v); | |
mesh.addTexCoord(ofxLerp(tTop,tBottom,f)); | |
} | |
} | |
for (float y=0; y<rows; y++) { | |
for (float x=0; x<cols; x++) { | |
mesh.addTriangle(ofxIndex(x,y,cols+1), ofxIndex(x+1,y,cols+1), ofxIndex(x,y+1,cols+1)); | |
mesh.addTriangle(ofxIndex(x+1,y,cols+1), ofxIndex(x+1,y+1,cols+1), ofxIndex(x,y+1,cols+1)); | |
} | |
} | |
tex.getTextureReference().bind(); | |
mesh.draw(); | |
tex.getTextureReference().unbind(); | |
mesh.drawVertices(); | |
} | |
}; | |
int main () { | |
ofSetupOpenGL(new ofAppGlutWindow, 800, 600, OF_WINDOW); | |
ofRunApp(new testApp); | |
} |
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