Hi @gluon,
as zach said there’s the ofPath option. you can call the getCommands() from it which will give you a vector of ofPath::commands which are actually the commands and parameters stored whenever you called moveTo(…) or bezierTo(…). you can access those and modify them. I’ve been using this method a lot lately. Whenever you modify the ofPath through the commands, its polylines will get recalculated that you can access through the getOutline() method, which returns a vector object,then use the getPointForPercent() method on these.
take a look at the following.
ofApp.h
#pragma once
#include "ofMain.h"
class ofApp : public ofBaseApp{
public:
void setup();
void update();
void draw();
void mouseDragged(int x, int y, int button);
ofPath path;
float pct;
};
ofApp.cpp
#include "ofApp.h"
//--------------------------------------------------------------
void ofApp::setup(){
path.moveTo(ofPoint(400,400));
path.bezierTo(ofPoint(500,500), ofPoint(600,300), ofPoint(400,600));
path.setFilled(false);
path.setStrokeWidth(3);
}
//--------------------------------------------------------------
void ofApp::update(){
pct+=0.01;
if (pct >1) {
pct = 0;
}
}
//--------------------------------------------------------------
void ofApp::draw(){
path.draw();
ofSetColor(ofColor::red);
ofDrawCircle(path.getOutline().back().getPointAtPercent(pct), 20);
}
//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){
path.getCommands().back().to.set(ofPoint(x,y));
}
Hope it helps.
best!
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