@Ha99 wrote:

Hello, I am new to OpenFrameworks coming from Processing. I keep receiving Thread 1: EXC_BAD_ACESS (code=1, address= 0x0).
The program animates an attractor of mouse position.

This is my program

pragma once

include "ofMain.h"

include

class ofApp : 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 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);

int num;
vector <int> vx;
vector <int> vy;
vector <int> x;
vector <int> y;
vector <int> ax;
vector <int> ay;

int magnetism;
int radius;

float size;

int decerleration;
int speed;

int xPos;
int yPos;

int distance;

int touchX;
int touchY;

int r;
int g;
int b;

};

include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){

ofBackground(0);

num = 1000;
magnetism = 10.0;
radius = 1;
decerleration = 0.95;

ofNoFill();
ofEnableBlendMode(OF_BLENDMODE_ADD);

//x.resize(num);

for(int i = 0; i< num; i++){
    x[i]= ofRandom(ofGetWidth());
    y[i] = ofRandom(ofGetHeight());
    vx[i] = 0;
    vy[i] = 0;
    ax[i] = 0;
    ay[i] = 0;

// x.push_back(x);
// x[i].set(x);
}

}

//--------------------------------------------------------------
void ofApp::update(){

}

//--------------------------------------------------------------
void ofApp::draw(){
ofSetColor(0, 0, 0);
ofDrawRectangle(0, 0, ofGetHeight(), ofGetWidth());

for(int i= 0; i< num; i++){
    distance = ofDist(touchX, touchY, x[i], y[i]);
    if(distance > 3){
        ax[i] = magnetism * (touchX - x[i]) / (distance * distance);
        ay[i] = magnetism * (touchY - y[i]) / (distance * distance);
    }
    vx[i] += ax[i];
    vy[i] += ay[i];

    vx[i] = vx[i] *decerleration;
    vy[i] = vy[i] *decerleration;

    x[i] += vx[i];
    y[i] += vy[i];

    speed = ofDist(0, 0, vx[i], vy[i]);
    r = ofMap(speed, 0, 5, 0, 255);
    g = ofMap(speed, 0, 5, 64, 255);
    b = ofMap(speed, 0, 5, 128, 255);
    ofSetColor(r, g, b, 32);
    ofDrawEllipse(x[i], y[i], radius, radius);
}

}

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