📅  最后修改于: 2021-01-05 00:37:30             🧑  作者: Mango
在前面的示例中,我们已经了解到在JOGL中可以借助GL_LINES参数绘制任何类型的形状。但是除此之外,JOGL还包含其他各种参数,通过这些参数我们可以直接绘制特定形状,例如三角形,四边形,多边形等(即,以更简单的方式)。
在此示例中,我们将看到如何在基本三角形参数(GL_TRIANGLES)的帮助下创建三角形。
Triangle.java
package com.javatpoint.jogl;
import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
public class Triangle implements GLEventListener {
@Override
public void init(GLAutoDrawable arg0)
{
}
@Override
public void display(GLAutoDrawable drawable) {
final GL2 gl = drawable.getGL().getGL2();
gl.glBegin(GL2.GL_TRIANGLES);
gl.glVertex2d(0,0.5);
gl.glVertex2d(-0.5,-0.5);
gl.glVertex2d(0.5,-0.5);
gl.glEnd();
}
@Override
public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4)
{
}
@Override
public void dispose(GLAutoDrawable arg0)
{
}
public static void main(String[] args) {
final GLProfile gp = GLProfile.get(GLProfile.GL2);
GLCapabilities cap = new GLCapabilities(gp);
final GLCanvas gc = new GLCanvas(cap);
Triangle tr = new Triangle();
gc.addGLEventListener(tr);
gc.setSize(400, 400);
final JFrame frame = new JFrame("JOGL Triangle");
frame.add(gc);
frame.setSize(500,400);
frame.setVisible(true);
}
}
输出:
在此示例中,我们将看到如何在基本四边形参数(GL_QUADS)的帮助下创建四边形。
JQuad.java
package com.javatpoint.jogl;
import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
public class JQuad implements GLEventListener {
@Override
public void init(GLAutoDrawable arg0)
{
}
@Override
public void display(GLAutoDrawable drawable) {
final GL2 gl = drawable.getGL().getGL2();
gl.glBegin(GL2.GL_QUADS);
gl.glVertex3f( 0.0f,0.5f,0);
gl.glVertex3f(-0.5f,0f,0);
gl.glVertex3f(0f,-0.5f,0);
gl.glVertex3f(0.5f,0f,0);
gl.glEnd();
}
@Override
public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4)
{
}
@Override
public void dispose(GLAutoDrawable arg0)
{
}
public static void main(String[] args) {
final GLProfile gp = GLProfile.get(GLProfile.GL2);
GLCapabilities cap = new GLCapabilities(gp);
final GLCanvas gc = new GLCanvas(cap);
JQuad jq = new JQuad();
gc.addGLEventListener(jq);
gc.setSize(400, 400);
final JFrame frame = new JFrame("JOGL Primitive Quadrilateral");
frame.add(gc);
frame.setSize(500,400);
frame.setVisible(true);
}
}
输出: