ofApp.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    
    ofBackground(255);
    ofEnableSmoothing();
    layoutPoints();
}

//--------------------------------------------------------------
void ofApp::update(){
    
    for(int i = 0; i < points.size(); i++) {
        
        float xOffset = 0.1 * cos(TWO_PI * i / (float)points.size());
        float yOffset = -0.1 * sin(TWO_PI * i / (float)points.size());
        
        if(toggle) {
            
            ofPoint p = points[i];
            p.x += xOffset;
            p.y += yOffset;
            
        } else {
            
            ofPoint &p = points[i];
            p.x += xOffset;
            p.y += yOffset;
            
        }
        
        
        ofPoint *pp = pointerPoints[i];
        pp->x += xOffset;
        pp->y += yOffset;
        
    }
}

//--------------------------------------------------------------
void ofApp::draw(){
    
    drawInstruction();
    
    ofFill();
    ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);
    
    ofSetColor(115, 19, 255);
    
    // Draw points
    for(int i = 0; i < points.size(); i++) {
        
        float x, y;
        
        if(toggle) {
            
            ofPoint p = points[i];
            x = p.x;
            y = p.y;
        
        } else {
            
            ofPoint &p = points[i];
            x = p.x;
            y = p.y;
            
        }
        
        ofCircle(x, y, 10);
    }
    
    // Draw points stored as pointers
    ofSetColor(19, 209, 255);
    for(int i = 0; i < pointerPoints.size(); i++) {
        ofPoint *pp = pointerPoints[i];
        ofRect(pp->x - 5, pp->y - 5, 10, 10);
    }
    
}

void ofApp::drawInstruction() {
    
    ofSetColor(30, 30, 30);
    string message = "Press T to toggle manipulating reference or copy:\n\nCurrently manipulating: ";
    message += (toggle ? "\"COPY\"" : "\"REFERENCE\"");
    
    ofDrawBitmapString(message, ofPoint(40, 40));
    
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
    
    if('t' == key) toggle = !toggle;
    
}

void ofApp::layoutPoints() {
    
    int row = 10;
    int col = 10;
    int padding = 30;
    
    toggle = false;

    
    for(int i = 0; i < row; i++) {
        
        float y = (i - row / 2.0) * padding;
        
        for(int j = 0; j < col; j++) {
            
            float x = (j - col / 2.0) * padding;
            
            // Make normal ofPoint
            ofPoint p(x, y);
            points.push_back(p);
            
            // Make ofPoint pointer
            ofPoint *pp = new ofPoint(x, y);
            pointerPoints.push_back(pp);
            
        }
    }
}

ofApp.h

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp{

    public:
	    void setup();
	    void update();
	    void draw();
	    void layoutPoints();
	    void drawInstruction();
	    void keyPressed(int key);
	    
        vector < ofPoint > points;
        vector < ofPoint* > pointerPoints;
        bool toggle;
};