diff options
Diffstat (limited to 'src')
| -rwxr-xr-x | src/demos/misc/Picking.java | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/demos/misc/Picking.java b/src/demos/misc/Picking.java new file mode 100755 index 0000000..a1a0030 --- /dev/null +++ b/src/demos/misc/Picking.java @@ -0,0 +1,265 @@ +//================================================================================= +// Picking 0.2 (Thomas Bladh) +//================================================================================= +// A simple picking example using java/jogl. This is far from a complete solution +// but it should give you an idea of how to include picking in your assigment +// solutions. +// +// Notes: * Based on example 13-3 (p 542) in the "OpenGL Programming Guide" +// * This version should handle overlapping objects correctly. +//--------------------------------------------------------------------------------- +import java.awt.*; +import java.awt.event.*; +import java.awt.Canvas.*; +import java.nio.*; +import java.util.*; +import javax.media.opengl.*; +import javax.media.opengl.glu.*; +import com.sun.opengl.util.*; + +public class Picking +{ + public static void main(String[] args) + { + new Picking(); + } + + Picking() + { + Frame frame = new Frame("Picking Example"); + GLDrawableFactory factory = GLDrawableFactory.getFactory(); + GLCapabilities capabilities = new GLCapabilities(); + GLCanvas drawable = new GLCanvas(capabilities); + drawable.addGLEventListener(new Renderer()); + frame.add(drawable); + frame.setSize(400, 400); + final Animator animator = new Animator(drawable); + frame.addWindowListener(new WindowAdapter() + { + public void windowClosing(WindowEvent e) + { + animator.stop(); + System.exit(0); + } + }); + frame.show(); + animator.start(); + } + + static class Renderer implements GLEventListener, MouseListener, MouseMotionListener + { + static final int NOTHING = 0, UPDATE = 1, SELECT = 2; + int cmd = UPDATE; + int mouse_x, mouse_y; + + private GLU glu = new GLU(); + private GLAutoDrawable gldrawable; + + public void init(GLAutoDrawable drawable) + { + GL gl = drawable.getGL(); + this.gldrawable = drawable; + gl.glEnable(GL.GL_CULL_FACE); + gl.glEnable(GL.GL_DEPTH_TEST); + gl.glEnable(GL.GL_NORMALIZE); + gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); + drawable.addMouseListener(this); + drawable.addMouseMotionListener(this); + } + + public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) + { + GL gl = drawable.getGL(); + float h = (float) height / (float) width; + gl.glViewport(0, 0, width, height); + gl.glMatrixMode(GL.GL_PROJECTION); + gl.glLoadIdentity(); + glu.gluOrtho2D(0.0f,1.0f,0.0f,1.0f); + } + + public void display(GLAutoDrawable drawable) + { + GL gl = drawable.getGL(); + switch(cmd) + { + case UPDATE: + drawScene(gl); + break; + case SELECT: + int buffsize = 512; + double x = (double) mouse_x, y = (double) mouse_y; + int[] viewPort = new int[4]; + IntBuffer selectBuffer = BufferUtil.newIntBuffer(buffsize); + int hits = 0; + gl.glGetIntegerv(GL.GL_VIEWPORT, viewPort, 0); + gl.glSelectBuffer(buffsize, selectBuffer); + gl.glRenderMode(GL.GL_SELECT); + gl.glInitNames(); + gl.glMatrixMode(GL.GL_PROJECTION); + gl.glPushMatrix(); + gl.glLoadIdentity(); + glu.gluPickMatrix(x, (double) viewPort[3] - y, 5.0d, 5.0d, viewPort, 0); + glu.gluOrtho2D(0.0d, 1.0d, 0.0d, 1.0d); + drawScene(gl); + gl.glMatrixMode(GL.GL_PROJECTION); + gl.glPopMatrix(); + gl.glFlush(); + hits = gl.glRenderMode(GL.GL_RENDER); + processHits(hits, selectBuffer); + cmd = UPDATE; + break; + } + } + + public void processHits(int hits, IntBuffer buffer) + { + System.out.println("---------------------------------"); + System.out.println(" HITS: " + hits); + int offset = 0; + int names; + float z1, z2; + for (int i=0;i<hits;i++) + { + System.out.println("- - - - - - - - - - - -"); + System.out.println(" hit: " + (i + 1)); + names = buffer.get(offset); offset++; + z1 = (float) buffer.get(offset) / 0x7fffffff; offset++; + z2 = (float) buffer.get(offset) / 0x7fffffff; offset++; + System.out.println(" number of names: " + names); + System.out.println(" z1: " + z1); + System.out.println(" z2: " + z2); + System.out.println(" names: "); + + for (int j=0;j<names;j++) + { + System.out.print(" " + buffer.get(offset)); + if (j==(names-1)) + System.out.println("<-"); + else + System.out.println(); + offset++; + } + System.out.println("- - - - - - - - - - - -"); + } + System.out.println("---------------------------------"); + } + + public int viewPortWidth(GL gl) + { + int[] viewPort = new int[4]; + gl.glGetIntegerv(GL.GL_VIEWPORT, viewPort, 0); + return viewPort[2]; + } + + public int viewPortHeight(GL gl) + { + int[] viewPort = new int[4]; + gl.glGetIntegerv(GL.GL_VIEWPORT, viewPort, 0); + return viewPort[3]; + } + + public void drawScene(GL gl) + { + gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); + + // Colors + float red[] = {1.0f,0.0f,0.0f,1.0f}; + float green[] = {0.0f,1.0f,0.0f,1.0f}; + float blue[] = {0.0f,0.0f,1.0f,1.0f}; + + // Red rectangle + GLRectangleEntity r1 = new GLRectangleEntity(gl, glu); + r1.x = 0.15f; + r1.y = 0.25f; + r1.w = 0.4f; + r1.h = 0.4f; + r1.c = red; + r1.id = 10; + r1.draw(); + + // Green rectangle + GLRectangleEntity r2 = new GLRectangleEntity(gl, glu); + r2.x = 0.35f; + r2.y = 0.45f; + r2.w = 0.4f; + r2.h = 0.4f; + r2.c = green; + r2.id = 20; + r2.draw(); + + // Blue rectangle + GLRectangleEntity r3 = new GLRectangleEntity(gl, glu); + r3.x = 0.45f; + r3.y = 0.15f; + r3.w = 0.4f; + r3.h = 0.4f; + r3.c = blue; + r3.id = 30; + r3.draw(); + + gl.glFlush(); + } + + public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {} + + public void mousePressed(MouseEvent e) + { + cmd = SELECT; + mouse_x = e.getX(); + mouse_y = e.getY(); + } + + public void mouseEntered(MouseEvent e) {} + public void mouseExited(MouseEvent e) {} + public void mouseReleased(MouseEvent e) {} + public void mouseClicked(MouseEvent e) {} + public void mouseDragged(MouseEvent e) {} + public void mouseMoved(MouseEvent e) {} + + public abstract class GLEntity + { + float x, y, z; + float[] c; + int id = 0; + boolean outline = false; + GL gl; + GLU glu; + public GLEntity(GL gl, GLU glu) + { + this.gl = gl; + this.glu = glu; + } + public void draw() + { + gl.glPushName(id); + _draw(); + } + public abstract void _draw(); + } + + public class GLRectangleEntity extends GLEntity + { + float w = 0.1f; + float h = 0.1f; + public GLRectangleEntity(GL gl, GLU glu) + { + super(gl, glu); + } + public void _draw() + { + if (outline) + gl.glPolygonMode(GL.GL_FRONT, GL.GL_LINE); + else + gl.glPolygonMode(GL.GL_FRONT, GL.GL_FILL); + + gl.glColor4fv(c, 0); + gl.glBegin(GL.GL_POLYGON); + gl.glVertex3f(x, y, z); + gl.glVertex3f(x + w, y, z); + gl.glVertex3f(x + w, y + h, z); + gl.glVertex3f(x, y + h, z); + gl.glEnd(); + } + } + } +} |