openGL Already called beginDraw() error on Processing 2.0 b3
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Contributed Library Questions
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1 year ago
Hi guys,
I'm trying to run a few sketchs in P3D (openGL) mode and I'm getting this "Already called beginDraw()" error that halts the program.
It happens with the controlP5 2.0.1 "controlFrame" example below (running on Processing 2.0 b3).
I put this thread on the Core Library section because I think it's openGL related. The controlP5 is just an example.
- /**
- * ControlP5 Controlframe
- * with controlP5 2.0 all java.awt dependencies have been removed
- * as a consequence the option to display controllers in a separate
- * window had to be removed as well.
- * this example shows you how to create a java.awt.frame and use controlP5
- * by Andreas Schlegel, 2012
- * www.sojamo.de/libraries/controlp5
- */
- import java.awt.Frame;
- import java.awt.BorderLayout;
- import controlP5.*;
- private ControlP5 cp5;
- ControlFrame cf;
- int def;
- void setup() {
- size(200, 200, P3D); // - - - - - - - - - - shows "Already called beginDraw()" error
- //size(200, 200); // - - - - - - - - - - works fine
- cp5 = new ControlP5(this);
- cp5.addSlider("test");
- // by calling function addControlFrame() a new frame is created and an instance of class ControlFrame is instanziated.
- cf = addControlFrame("extra");
- // with the newly created controlFrame we can access the controlP5 object by calling cf.control()
- // and proceed to create new controllers as usual.
- cf.control().addSlider("abc").plugTo(this, "def").setRange(0, 255);
- }
- void draw() {
- background(def);
- }
- ControlFrame addControlFrame(String theName) {
- Frame f = new Frame(theName);
- ControlFrame p = new ControlFrame(this, 400, 400);
- f.add(p);
- p.init();
- f.setTitle(theName);
- f.setSize(p.w, p.h);
- f.setLocation(120, 120);
- f.setResizable(false);
- f.setVisible(true);
- return p;
- }
- // the ControlFrame class extends PApplet, so we are creating a new processing applet inside a
- // new frame with a controlP5 object loaded
- public class ControlFrame extends PApplet {
- ControlP5 cp5;
- Object parent;
- int w, h;
- int abc;
- private ControlFrame() {
- }
- ControlFrame(Object theParent, int theWidth, int theHeight) {
- parent = theParent;
- w = theWidth;
- h = theHeight;
- }
- public ControlP5 control() {
- return cp5;
- }
- public void setup() {
- size(w, h);
- frameRate(25);
- cp5 = new ControlP5(this);
- }
- public void draw() {
- background(abc);
- }
- }
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