Cinder Baic Animation

gistfile1.cpp

#include "cinder/app/AppNative.h"
#include "cinder/gl/gl.h"
#include "cinder/Rand.h"

#define CIRCLE_COUNT 100;

using namespace ci;
using namespace ci::app;
using namespace std;

class BasicAnimationApp : public AppNative {
  public:
	void setup();
	void mouseDown( MouseEvent event );	
	void update();
	void draw();
    void prepareSettings(Settings *settings);
    
    Vec2f currentPos [CIRCLE_COUNT];
    Vec2f targetPos [CIRCLE_COUNT];
    float rad [CIRCLE_COUNT];
    
};

void BasicAnimationApp::prepareSettings(Settings *settings){
    settings->setWindowSize(800,600);
    settings->setFrameRate(60);
}


void BasicAnimationApp::setup()
{
    for (int i = 0; i<CIRCLE_COUNT; i++){
    currentPos[i].x = Rand::randFloat(0, getWindowWidth());
        currentPos[i].y = Rand::randFloat(0, getWindowHeight());
    targetPos[i].x = Rand::randFloat(0, getWindowWidth());
      targetPos[i].y = Rand::randFloat(0, getWindowHeight());
        rad[i] = Rand::randFloat(5,25);
    }
}

void BasicAnimationApp::mouseDown( MouseEvent event )
{
}

void BasicAnimationApp::update()
{
    Vec2f difference;
    for (int i =0; i < CIRCLE_COUNT; i ++){
        
    difference = targetPos[i] - currentPos[i];
    difference *= 0.98f;
    currentPos[i] = targetPos[i] - difference;
    
    if (currentPos[i].distance(targetPos[i]) < 1.0f){
        targetPos[i].x = Rand::randFloat(0, getWindowWidth());
        targetPos[i].y = Rand::randFloat(0, getWindowHeight());
    }
    }
}

void BasicAnimationApp::draw()
{
	// clear out the window with black
	gl::clear( Color( 0, 0, 0 ) );
    
    for (int i = 0; i < CIRCLE_COUNT; i++){
    
    gl::drawSolidCircle(currentPos[i],rad[i]);
}
}

CINDER_APP_NATIVE( BasicAnimationApp, RendererGl )