dot.cpp

#include "dot.h"
#include "ofMain.h"

struct dot {
    int x;
    int y;
    float r;
    ofColor color;
};

struct dot *dot_struct(int x, int y, float r){
    struct dot *thisDot = (struct dot*)malloc(sizeof(struct dot));
    thisDot->x = x;
    thisDot->y = y;
    thisDot->r = r;
    return thisDot;

}

void dot_move_right(struct dot* dot){
    dot->x++;
}

void dot_move_down(struct dot* dot){
    dot->y++;
}


void dot_grow(struct dot* dot){
    float growthRate = 0.0025;
    dot->r = dot->r + (dot->r * growthRate);
}

void dot_draw(struct dot* dot){
    ofDrawCircle(dot->x, dot->y,dot->r);
    ofColor green(0,230,38);
    ofSetColor(green);
}

dot.h

#pragma once

struct dot* dot_struct(int x, int y, float r);
void dot_draw(struct dot*);
void dot_move_right(struct dot*);
void dot_move_down(struct dot*);
void dot_grow(struct dot*);

main.cpp

#include "ofMain.h"
#include "ofApp.h"

//========================================================================
int main( ){
    ofSetupOpenGL(1062,600,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());

}

ofApp.cpp

#include "ofApp.h"
#include "dot.h"

//--------------------------------------------------------------
void ofApp::setup(){
    //ofSetBackgroundColor(60,150,10);
    rick_morty.load("/home/sledge/of_v0.9.8_linux64_release/apps/myApps/TaylorHW11/bin/images/rick_morty.jpg");
    ofSetCircleResolution(60);
    whiteDot = dot_struct(0,0,20.0);
}

//--------------------------------------------------------------
void ofApp::update(){
    dot_move_right(whiteDot);
    dot_move_down(whiteDot);
    dot_grow(whiteDot);
}

//--------------------------------------------------------------
void ofApp::draw(){
    rick_morty.draw(0,0,1062,600);
    dot_draw(whiteDot);
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

}

//--------------------------------------------------------------
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::mouseEntered(int x, int y){

}

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

}

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

}

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

}

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

}

ofApp.h

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp{

	public:
        struct dot *whiteDot;
		void setup();
		void update();
		void draw();
        ofImage rick_morty;
		void keyPressed(int key);
		void keyReleased(int key);
		void mouseMoved(int x, int y );
		void mouseDragged(int x, int y, int button);
		void mousePressed(int x, int y, int button);
		void mouseReleased(int x, int y, int button);
		void mouseEntered(int x, int y);
		void mouseExited(int x, int y);
		void windowResized(int w, int h);
		void dragEvent(ofDragInfo dragInfo);
		void gotMessage(ofMessage msg);
		
};