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  rendering arc  (Read 809 times)
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Offline paulo.carabuena

Senior Newbie





« Posted 2012-03-04 15:04:51 »

hello guys, i need your help with this.. i've been trying to render an arc in OpenGL but all i'm getting at always is an oval..

here is the code

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   private void renderArc(float x, float y, float width, float height,
         float start, float end, int cap)
   {
      float theta;
      float angle_increment;
      float x1;
      float y1;

      angle_increment = (float) (2 * MathHelper.pi()) / 90;
     
      GL11.glPushMatrix();

      GL11.glTranslatef(x + (width / 2), y + (height / 2), 0);

      this.setProperties();

      GL11.glBegin(cap);
      for (theta = start; theta < end + angle_increment; theta += angle_increment)
      {
         x1 = (float) ((width / 2) * Math.cos(theta));
         y1 = (float) ((height / 2) * Math.sin(theta));

         GL11.glVertex2f(x1, y1);
      }
      GL11.glEnd();

      GL11.glPopMatrix();

      GL11.glColor3f(1.0f, 1.0f, 1.0f);
   }
Offline Roquen
« Reply #1 - Posted 2012-03-04 17:31:18 »

Look at how you're scaling the 'x' & 'y' coordinates.
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