如何使用JOgl在jPanel上绘图

Question

我在Netbeans 8.0.2中使用JOGL。我想在面板上绘制经典的彩色三角形，并且使用Netbeans调色板控件选择几何图形的边数（4,5侧），但我不知道如何。面板在框架上。到目前为止，我的代码是：

类PanelGL：

package panelgl; 

import com.jogamp.opengl.*; 
import com.jogamp.newt.event.WindowAdapter; 
import com.jogamp.newt.event.WindowEvent; 
import com.jogamp.newt.opengl.GLWindow; 
import com.jogamp.opengl.GLCapabilities; 
import com.jogamp.opengl.awt.GLCanvas; 
import com.jogamp.opengl.awt.GLJPanel; 
import java.awt.Dimension; 
import javax.swing.JFrame; 

public class PanelGL implements GLEventListener{ 

     public static void main(String[] args) { 
      final GLProfile profile = GLProfile.get(GLProfile.GL2); 
      GLCapabilities capabilities = new GLCapabilities(profile); 

      final GLJPanel glpanel = new GLJPanel(capabilities); 
      PanelGL triangle = new PanelGL(); 
      glpanel.addGLEventListener(triangle); 
      glpanel.setSize(400, 400); 

      final GLFrame frame = new GLFrame ("Colored Triangle"); 

      frame.getContentPane().add(glpanel); 
      frame.setSize(frame.getContentPane().getPreferredSize()); 
      frame.setVisible(true); 
     } 

     @Override 
     public void init(GLAutoDrawable glad) { } 

     @Override 
     public void dispose(GLAutoDrawable glad) { } 

     @Override 
     public void display(GLAutoDrawable glad) {  
       final GL2 gl = glad.getGL().getGL2(); 
       gl.glBegin(GL2.GL_TRIANGLES); 
       gl.glColor3f(1.0f, 0.0f, 0.0f); // Red 
       gl.glVertex3f(0.5f,0.7f,0.0f); // Top 
       gl.glColor3f(0.0f,1.0f,0.0f);  // green 
       gl.glVertex3f(-0.2f,-0.50f,0.0f); // Bottom Left 
      gl.glColor3f(0.0f,0.0f,1.0f);  // blue 
      gl.glVertex3f(0.5f,-0.5f,0.0f); // Bottom Right 

      gl.glEnd();  
     } 

    @Override 
    public void reshape(GLAutoDrawable glad, int i, int i1, int i2, int i3) { } 

} 

类GLFrame

 public class GLFrame extends javax.swing.JFrame { 

     public GLFrame(String title) { 
      this.setTitle(title); 
      initComponents(); 
     } 

      private javax.swing.JPanel glPanel; 
    } 

glPanel是通过调色板增加。

我想要绘制在这个具体面板（glPanel）。

Answer 1

创建一个扩展GLJPanel而不是GLEventListener的类。你仍然会在内部使用GLEventListener。编辑完课程后，您可以在弹出菜单的“项目”窗口中右键单击它，以选择Tools - >Add To Palette ...将其添加到调板中。要创建一个可编辑的属性，只需在getter和setter中使用正常的bean模式，或者使用Alt-Insert，然后选择Add Property来添加变量以及getter和setter。

如..

import com.jogamp.opengl.GL2; 
import com.jogamp.opengl.GLAutoDrawable; 
import com.jogamp.opengl.GLCapabilities; 
import com.jogamp.opengl.GLEventListener; 
import com.jogamp.opengl.GLProfile; 
import com.jogamp.opengl.awt.GLJPanel; 
import java.awt.Dimension; 


public class MyJOGLFigure extends GLJPanel { 

    public MyJOGLFigure() { 
     this.setPreferredSize(new Dimension(100,100)); 
     final GLProfile profile = GLProfile.get(GLProfile.GL2); 
     GLCapabilities capabilities = new GLCapabilities(profile); 
     this.addGLEventListener(new GLEventListener() { 

      @Override 
      public void init(GLAutoDrawable glad) { 

      } 

      @Override 
      public void dispose(GLAutoDrawable glad) { 

      } 

      @Override 
      public void display(GLAutoDrawable glad) { 
       System.out.println("numberOfSides = " + numberOfSides); 
       final GL2 gl = glad.getGL().getGL2(); 
       gl.glBegin(GL2.GL_TRIANGLES); 
       gl.glColor3f(1.0f, 0.0f, 0.0f); // Red 
       gl.glVertex3f(0.5f, 0.7f, 0.0f); // Top 
       gl.glColor3f(0.0f, 1.0f, 0.0f);  // green 
       gl.glVertex3f(-0.2f, -0.50f, 0.0f); // Bottom Left 
       gl.glColor3f(0.0f, 0.0f, 1.0f);  // blue 
       gl.glVertex3f(0.5f, -0.5f, 0.0f); // Bottom Right 

       gl.glEnd(); 
      } 

      @Override 
      public void reshape(GLAutoDrawable glad, int i, int i1, int i2, int i3) { 

      } 
     }); 
    } 

    // Example editable property. 
    private int numberOfSides = 3; 

    /** 
    * Get the value of numberOfSides 
    * 
    * @return the value of numberOfSides 
    */ 
    public int getNumberOfSides() { 
     return numberOfSides; 
    } 

    /** 
    * Set the value of numberOfSides 
    * 
    * @param numberOfSides new value of numberOfSides 
    */ 
    public void setNumberOfSides(int numberOfSides) { 
     this.numberOfSides = numberOfSides; 
    } 
} 

你从调色板到JFrame设计拖着MyJoglFigure后，你可以找到和编辑numberOfSides财产。请注意，我只打印它，我实际上并未使用它来更改图纸。 （为读者锻炼？）