ofBek2.cpp

//////////// testApp.h

#pragma once

#include "ofMain.h"

class Ball {
public:
    ofPoint pos;    //it's better to use ofVec3f instead of ofPoint
    ofPoint vel;
    ofColor color;
    int size;
};

class testApp : public ofBaseApp{
public:
    void setup();
    void update();
    void draw();

    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 windowResized(int w, int h);
    void dragEvent(ofDragInfo dragInfo);
    void gotMessage(ofMessage msg);
	
	Ball ball;
    
};


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//--------------------------------------------------------------
//////////// testApp.cpp 
//--------------------------------------------------------------


#include "testApp.h"

//--------------------------------------------------------------
void testApp::setup(){
    ofSetFrameRate(60);             //limit framerate to 60
    ofSetBackgroundAuto(false);     //turn off automatic background clearing
    ofEnableAlphaBlending();        //enable transparency
    ofBackground(0);                //set background to black
    
    ball.pos.set(100,200);
    ball.vel.set(5,5);
}

//--------------------------------------------------------------
void testApp::update(){
    
    //ball.pos = ball.pos + ball.vel;   //this is for dummies
    ball.pos += ball.vel;   //this is for smart people
    
    //check if ball hits the sides of the screen, if so then bounce back
    if (ball.pos.x > ofGetWidth()) ball.vel.x *= -1;
    if (ball.pos.y > ofGetHeight()) ball.vel.y *= -1;
    if (ball.pos.x < 0) ball.vel.x *= -1;
    if (ball.pos.y < 0) ball.vel.y *= -1;

}

//--------------------------------------------------------------
void testApp::draw(){

    //draw a semi transparent black rectangle
    ofSetColor(0,20);              
    ofRect(0,0,ofGetWidth(),ofGetHeight());
    
    //draw a white circle
    ofSetColor(255);
    ofCircle(ball.pos.x, ball.pos.y, 50);
}

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

}

//--------------------------------------------------------------
void testApp::keyReleased(int key){

}

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

}

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

}

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

}

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

}

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

}

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

}

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

}