Noise-based Bitmap Collage

gistfile1.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    numberOfSlices = 11;
    source.loadImage("source.jpg");
    source.resize(1920 * 2, 1080 * 2);
    canvas.allocate(1920 * 2, 1080 * 2, GL_RGBA);
    canvas.begin();
    ofClear(0);
    canvas.end();
    ofSeedRandom();
    for (int i = 0; i < numberOfSlices; i++) {
        ofImage img;
        img.loadImage("slices/slice-" + ofToString(i) + ".png");
        slices.push_back(img);
    }
    float noiseScale = 0.00085;
    float t = ofRandom(100);
    for (int x = 0; x < canvas.getWidth(); x++){
        for (int y = 0; y < canvas.getHeight(); y++) {
            data[x][y] = ofNoise(x * noiseScale, y * noiseScale);
        }
    }
}

//--------------------------------------------------------------
void ofApp::update(){
    for(int i = 0; i < 1000; i++) {
        randomPoint.x = ofRandom(canvas.getWidth());
        randomPoint.y = ofRandom(canvas.getHeight());
        int randX = floor(randomPoint.x);
        int randY = floor(randomPoint.y);
        float noise = data[randX][randY];
        ofColor c = source.getColor(floor(randomPoint.x), floor(randomPoint.y));
        canvas.begin();
        ofPushMatrix();
        float scale = ofMap(noise, 0, 1, 0.15, 1.5);
        ofImage img = slices[floor(ofRandom(slices.size()))];
        ofTranslate(randomPoint.x - img.width / 2, randomPoint.y - img.height/2);
        ofScale(scale, scale);
        ofSetColor(c,ofMap(noise,0,1,0,200));
        ofRotate(ofMap(noise,0,1,-20,20));
        glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,GL_ONE,GL_ONE_MINUS_SRC_ALPHA);
        img.draw(0,0);
        
        
        ofPopMatrix();
        canvas.end();
    }
}

//--------------------------------------------------------------
void ofApp::draw(){
    ofEnableBlendMode(OF_BLENDMODE_ALPHA);
    ofBackground(255, 255, 255);
    ofSetColor(255, 255, 255);
    canvas.draw(0,0,ofGetWidth(), ofGetHeight());
}

void ofApp::saveFbo(){
    ofFbo img;
    ofPixels pixels;
    img.allocate(1920 * 2, 1080 * 2, GL_RGBA);
    img.begin();
    ofClear(0);
    canvas.draw(0, 0);
    img.end();
    img.readToPixels(pixels);
    ofSaveImage(pixels, "image"+ofToString(floor(ofRandom(10000)))+".tif");
    
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
    if(key == 's') {
        saveFbo();
    }
}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){
    
}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){
    
}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){
    
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){
    
}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){
    
}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){
    
}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){
    
}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 
    
}