gistfile1.txt

#include "ofMain.h"

class ofApp : public ofBaseApp{
public:

    ofRectangle viewport;
    bool bUseOrtho, bUseCamera;
    ofCamera cam;

//--------------------------------------------------------------
void setup(){
    randomizeViewport();
    cam.setVFlip(true);
    bUseOrtho = true;
    bUseCamera = true;
    setCamOrtho();
}
//--------------------------------------------------------------
void randomizeViewport(){
    viewport.x = ofRandom(ofGetWidth()*0.5f);
    viewport.y = ofRandom(ofGetHeight()*0.5f);
    viewport.width = ofRandom(ofGetWidth()-viewport.x);
    viewport.height = ofRandom(ofGetHeight()-viewport.y);
    
    cam.setPosition(0, 0, cam.getImagePlaneDistance(viewport));
}
//--------------------------------------------------------------
void draw(){
    
    ofBackground(0);
    ofSetColor(255);
    ofNoFill();
    ofDrawRectangle(viewport);
    
    if (bUseCamera) {
        ofPushMatrix();
        cam.begin(viewport);
        ofTranslate(-viewport.width/2, -viewport.height/2);
    }else{
        ofPushView();
        ofViewport(viewport);
        if(bUseOrtho){
            ofSetupScreenOrtho();
        }else{
            ofSetupScreenPerspective();
        }
    }
    
    ofFill();
    int r = 20;
    ofSetColor(ofColor::red);
    ofDrawCircle(r,r,r);
    ofSetColor(ofColor::cyan);
    ofDrawCircle(viewport.width-r, viewport.height -r, r);
    ofSetColor(ofColor::yellow);
    ofDrawCircle(viewport.width-r, r, r);
    ofSetColor(ofColor::darkGreen);
    ofDrawCircle(r, viewport.height -r, r);
    ofSetColor(ofColor::white);
    ofDrawCircle(viewport.width/2, viewport.height/2, r);
    
    if (bUseCamera) {
        cam.end();
        ofPopMatrix();
    }else{
        ofPopView();
    }
    
    string s = (string)(bUseCamera?"USING CAMERA":"NOT USING CAMERA") + "\n"+ (string)(bUseOrtho?"ORTHO":"PERSPECTIVE");
    if (bUseCamera) {
        s += "\nCam Projection Matrix:\n"+ofToString(cam.getProjectionMatrix());
        s += "\n\nCam Model View Matrix:\n"+ofToString(cam.getModelViewMatrix());
    }
    ofDrawBitmapString(s, 20, 20);
}

//--------------------------------------------------------------
void setCamOrtho(){
    if (bUseCamera) {
        if (bUseOrtho) {
            cam.enableOrtho();
        }else{
            cam.disableOrtho();
        }
    }
}
//--------------------------------------------------------------
void keyReleased(int key){
    if(key == ' '){
        bUseOrtho ^= true;
        setCamOrtho();
    }else if(key == 'c'){
        bUseCamera  ^=true;
        setCamOrtho();
    }else if(key == 'r'){
        randomizeViewport();
    }
}
};



//========================================================================
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());

}