strange effect after using OPENGL

Shunwei

hi guys, i wrote some code about a circle(or like the watch) to show the month, for example: at 6 o'clock is june, so at 12 o'clock is december, every thing is fine, until i realized the antialiasing, so i used OPENGL in the size(width, height, OPENGL), then i found the month-clock is broken at 3 o'clock. any idea?

    import processing.opengl.*;
    int radius, thickness;
    PImage img;
    PGraphics testPG;

    void setup(){
      size(displayWidth, displayHeight, OPENGL);
      background(80);

    }

    void draw(){
      testPG = createGraphics(displayWidth, displayHeight, OPENGL);
      testPG.beginDraw();
      testPG.noFill();
      radius = 175;
      thickness = 35;
      elevation = 40;
      testPG.strokeWeight(thickness);

      testPG.arc(200, 200, radius, radius, -PI/2, month()*TWO_PI/12-PI/2);

      testPG.endDraw();

      img = testPG.get(0,0,displayWidth, displayHeight);
      image(img, 0, 0);

    }

Winchestro

Sorry I can't help you with the opengl problem, but image() will take a PImage or a PGraphcis object. You don't need to convert them.

Shunwei

I have to use the Image, because I have to add some SVG file on the foreground, without Image, the SVG files will just stay in the background.

Poersch

What exactly do you mean with broken?

Does the following code fix your problem?

import processing.opengl.*;

int radius = 175;
int thickness = 35;
int elevation = 40;
PGraphics testPG;

void setup(){

  size(400, 400, P2D); // Don't use OPENGL unless you have to, it doesn't support many of processing's drawing abilities
  background(80);

  // Don't create a PGraphics object at runtime unless you absolutely have to
  testPG = createGraphics(400, 400, P2D);
  testPG.beginDraw();
  testPG.smooth(4); // testPG.noSmooth(); // In case you want aliased edges
  testPG.strokeCap(SQUARE);
  testPG.noFill();
  testPG.endDraw();

}

void draw(){

  testPG.beginDraw();
  testPG.strokeWeight(thickness);
  testPG.arc(200, 200, radius, radius, -HALF_PI, TWO_PI / 12.0 * month() - HALF_PI);
  testPG.endDraw();

  // Just draw the PGraphics object, no need to "convert" it to an image (like Winchestro wrote)
  image(testPG, 0, 0);

}

Btw.: If you want to run your applet in fullscreen mode, just add the following function to your sketch:

boolean sketchFullScreen() {
    return true;
}

Shunwei

Hmm, i just have the Problem wenn december, it is jan, so everything looks fine