From 880653d31a8f1ff8384fdbc75b84934bceecfdb8 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sat, 18 Nov 2000 06:43:49 +0000
Subject: Initial revision

---
 demos/MiscDemos/GLImageWorld1.java | 456 +++++++++++++++++++++++++++++++++++++
 1 file changed, 456 insertions(+)
 create mode 100755 demos/MiscDemos/GLImageWorld1.java

(limited to 'demos/MiscDemos/GLImageWorld1.java')

diff --git a/demos/MiscDemos/GLImageWorld1.java b/demos/MiscDemos/GLImageWorld1.java
new file mode 100755
index 0000000..6ac78f5
--- /dev/null
+++ b/demos/MiscDemos/GLImageWorld1.java
@@ -0,0 +1,456 @@
+import gl4java.*;
+import gl4java.awt.*;
+import gl4java.utils.textures.*;
+
+import java.awt.*;
+import java.awt.event.*;
+import java.net.*;
+
+public class GLImageWorld1 extends GLCanvas
+    implements MouseListener,MouseMotionListener
+{
+    float     []mPosObjTrans;
+    float     []mPosObjRot;
+
+    Point   mousePoint;
+    Point   oldMousePoint;
+    boolean mouseMoveFlag;
+	
+    
+   TextureGrabber textGrab4Snapshot = null;
+   String         textGrab4SnapshotFName = null;
+
+   TextureLoader txtLoader = null;
+   int texName[] = {0};
+   
+    public GLImageWorld1 (int w, int h)
+    {
+	super(w, h);
+    }
+
+    /**
+     * Creates a snapshot (save texture/image) of the current
+     * GL-Context !
+     *
+     * The snapshot itself is created delayed,
+     * so no return value is avaiable.
+     * Because this is a non critical path, I hope its enough !
+     *
+     * @param tg The TextureGrabber
+     * @param fname The filename
+     * @see TextureGrabber
+     */
+    public void snapshot(TextureGrabber tg, String fname) 
+    {
+    	textGrab4Snapshot=tg;
+	textGrab4SnapshotFName=fname;
+	repaint();
+    }
+
+    public void setOriginalPerspective()
+    {
+    	setOriginalPerspective(true);
+    }
+
+    private void setOriginalPerspective(boolean fetchGL)
+    {
+	 for(int i=0;i<16;i++)
+	     mPosObjTrans[i]=0f;
+	 mPosObjTrans[0]=mPosObjTrans[5]=mPosObjTrans[10]=mPosObjTrans[15]=1f;  
+	 for(int i=0;i<16;i++)
+	     mPosObjRot[i]=0f;
+	 mPosObjRot[0]=mPosObjRot[5]=mPosObjRot[10]=mPosObjRot[15]=1f;  
+
+	 if(fetchGL)
+	 {
+		 if( glj.gljMakeCurrent() == false ) 
+		      System.out.println("problem in use() method");
+	 }
+
+	 TranlateObj(0f,0f,-10f);
+         SetCamera();
+
+	 if(fetchGL)
+	 {
+		 glj.gljCheckGL();
+		 glj.gljFree();
+		 repaint();
+	 }
+    }
+
+    public void preInit()
+    {
+	// createOwnWindow = true;
+    }
+
+    public void init()
+    {
+	 gl.glEnable(GL_TEXTURE_2D);
+	    
+	 gl.glGenTextures(1,texName);
+	 gl.glBindTexture(GL_TEXTURE_2D,texName[0]);
+	    
+	 //gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
+	 //gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
+	 //gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
+	 //gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
+	 gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
+	 gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
+	 gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
+	 gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
+         gl.glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+	 // cameraMatrix init   
+	 mPosObjTrans=new float[16];
+	 mPosObjRot=new float[16];
+
+    	 setOriginalPerspective(false);
+	
+	 gl.glShadeModel (GL_SMOOTH);
+	 gl.glEnable(GL_DEPTH_TEST);
+	
+	 gl.glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
+	 gl.glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	 glj.gljCheckGL();
+
+	 addMouseListener(this);
+	 addMouseMotionListener(this);
+	 mouseMoveFlag=false;
+
+	 reshape(getSize().width, getSize().height);
+    }
+
+    /**
+     * These variables are very important
+     * to respect the texture-size ratio !
+     */
+    float texMaxPosX = 1f;
+    float texMaxPosY = 1f;
+
+    public boolean loadTexture(String name, String type)
+    {
+	 boolean ok = true;
+
+	 if( glj.gljMakeCurrent() == false ) 
+	 {
+	      System.out.println("problem in use() method");
+	      return false;
+	 }
+
+	 // texture laden
+	 if(type.equals("png"))
+		 txtLoader = new PngTextureLoader(gl, glu);
+	 else if(type.equals("ppm"))
+		 txtLoader = new PPMAsciiTextureLoader(gl, glu);
+	 else if(type.equals("tga"))
+		 txtLoader = new TGATextureLoader(gl, glu);
+	 else if(type.equals("any"))
+		 txtLoader = new AWTTextureLoader(this, gl, glu);
+	 else {
+		System.out.println("Imagetype: "+type+" is currently not supported !");
+		ok = false;
+	 }
+
+	 if(ok)
+	 {
+		try {
+			txtLoader.readTexture(name);
+		} catch (Exception ex) {
+			ex.printStackTrace();
+		}
+	 }
+
+	 if(ok && txtLoader.isOk())
+	 {
+	    gl.glEnable(GL_TEXTURE_2D);
+	    
+	    txtLoader.texImage2DScaled4BestSize();
+
+	    texMaxPosX = 1f;
+	    texMaxPosY = 1f;
+	    float texAspect = txtLoader.getTextureWidth()/
+	    		      txtLoader.getTextureHeight();
+
+	    if(txtLoader.getTextureWidth()>txtLoader.getTextureHeight())
+		    texMaxPosY = 1f/texAspect;
+	    else
+		    texMaxPosX = texAspect;
+	    System.out.println("texture succesfully loaded !");
+	    System.out.println("texture: "+txtLoader);
+	 }
+	 glj.gljCheckGL();
+	 glj.gljFree();
+	 if(ok)
+		repaint();
+	 return ok;
+    }
+
+    public void display()
+    {
+      int i;
+
+      /* Standard GL4Java Init */
+      if( glj.gljMakeCurrent() == false ) 
+      {
+	System.out.println("problem in use() method");
+	return;
+      }
+
+      // just render it
+      gl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+      SetCamera();
+
+      DrawScene();
+      
+      if(textGrab4Snapshot!=null)
+      {
+	  textGrab4Snapshot.grabPixels(GL_BACK, 
+			               0, 0, cvsGetWidth(), cvsGetHeight());
+	  if(textGrab4SnapshotFName!=null)
+		  textGrab4Snapshot.write2File(textGrab4SnapshotFName);
+
+    	  textGrab4Snapshot     =null;
+	  textGrab4SnapshotFName=null;
+      }
+      
+      /* For your animation dutys ;-) */
+      glj.gljSwap();
+      glj.gljCheckGL();
+      glj.gljFree();
+    }
+
+    public void reshape(int w, int h)
+    {
+	gl.glMatrixMode (GL_MODELVIEW);
+	gl.glViewport (0, 0, w, h);
+	gl.glLoadIdentity();
+	SetCamera();
+    }
+
+
+    public void drawGrid(float x0, float y0,
+			 float width, float height, float step)
+    {
+	float i,j;
+
+	/* draw grid */
+	gl.glBegin(GL_LINES);
+	for(i=x0;i<width;i+=step)
+		for(j=y0;j<height;j+=step)
+		{
+			if(i==0f && j==0f)
+				gl.glColor3f (1f,0f,0f);
+			else
+				gl.glColor3f (0.6f,0.5f,0.5f);
+			gl.glVertex2f(0f,j);
+			gl.glVertex2f(width,j);
+			gl.glVertex2f(i,height);
+			gl.glVertex2f(i,0f);
+		}
+	gl.glEnd();
+    }
+
+    void DrawScene()
+    {
+	 gl.glMatrixMode (GL_MODELVIEW);
+	 gl.glLoadIdentity ();
+	  
+	 // kamera setzen
+	 gl.glLoadMatrixf(mPosObjTrans);
+	 gl.glMultMatrixf(mPosObjRot);
+	  
+	 gl.glPushMatrix();
+	    gl.glDisable(GL_TEXTURE_2D);
+	    drawGrid(0f, 0f, 10f, 10f, 0.5f);
+	 gl.glPopMatrix();
+
+	 // obj zeichnen
+
+	 gl.glPushMatrix();
+	    gl.glScalef(2f,2f,2f);
+	    gl.glColor3f(1f,0f,0f);
+	    gl.glDisable(GL_TEXTURE_2D);
+	    DrawObj();
+	 gl.glPopMatrix();
+	 
+	 if(texName[0]!=0)
+		 gl.glEnable(GL_TEXTURE_2D);
+	 
+	 gl.glEnable(GL_BLEND);
+	 gl.glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+
+	 gl.glColor3f(1f,1f,1f);
+
+	 gl.glPushMatrix();
+	    gl.glScalef(3f,3f,3f);
+	    gl.glTranslatef(-1f,0f,1f);
+	    DrawObj();
+	 gl.glPopMatrix();
+
+	 gl.glPushMatrix();
+	    gl.glScalef(3f,3f,3f);
+	    gl.glTranslatef(1f,0f,1f);
+	    DrawObj();
+	 gl.glPopMatrix();
+	 
+	 gl.glPushMatrix();
+	    gl.glScalef(3f,3f,3f);
+	    gl.glTranslatef(-2f,1f,1f);
+	    Billboard();
+	    DrawObj();
+	 gl.glPopMatrix();
+	 
+	 gl.glDisable(GL_BLEND);
+    }
+    
+    void DrawObj()
+    {
+	gl.glPushMatrix();
+	    gl.glBegin(GL_QUADS);
+		gl.glNormal3f(0f,0f,1f);
+		gl.glTexCoord2f(0f,0f);
+		gl.glVertex3f(0f,0f,0f);
+
+		gl.glNormal3f(0f,0f,1f);
+		gl.glTexCoord2f(0f,1f);
+		gl.glVertex3f(0f,texMaxPosY,0f);
+		
+		gl.glNormal3f(0f,0f,1f);
+		gl.glTexCoord2f(1f,1f);
+		gl.glVertex3f(texMaxPosX,texMaxPosY,0f);
+		
+		gl.glNormal3f(0f,0f,1f);
+		gl.glTexCoord2f(1f,0f);
+		gl.glVertex3f(texMaxPosX,0f,0f);
+	    gl.glEnd();
+	gl.glPopMatrix();
+    }
+
+    float     winaspect  = 1f;
+    float     imgaspect  = 1f;
+    float     imgwidth   = 1f;
+    float     imgheight  = 1f;
+
+    void SetCamera()
+    {
+	    Dimension   dim=getSize();
+	    float       aspect=(float)dim.width/(float)dim.height;
+
+	    gl.glMatrixMode (GL_PROJECTION);
+	    gl.glLoadIdentity ();
+	    glu.gluPerspective(60f,aspect,.01,100);
+    }
+   
+    void RotateObj(float  degree,
+		   float  axisX,
+		   float  axisY,
+		   float  axisZ)
+    {
+	if( glj.gljMakeCurrent() == false ) 
+	{
+	    System.out.println("problem in use() method");
+	    return;
+	}
+	
+	 gl.glMatrixMode (GL_MODELVIEW);
+	 gl.glLoadIdentity ();
+	  
+	 // kamera setzen
+	 gl.glRotatef(degree,axisX,axisY,axisZ);
+	 gl.glMultMatrixf(mPosObjRot);
+	 gl.glGetFloatv(GL_MODELVIEW_MATRIX,mPosObjRot);
+	 
+	 repaint();
+    }
+    
+    void TranlateObj(float x,float y,float z)
+    {
+	if( glj.gljMakeCurrent() == false ) 
+	{
+	    System.out.println("problem in use() method");
+	    return;
+	}
+ 
+	 gl.glMatrixMode (GL_MODELVIEW);
+	 gl.glLoadIdentity ();
+	  
+	 // kamera setzen
+	 gl.glLoadMatrixf(mPosObjTrans);
+	 gl.glTranslatef(x,y,z);
+	 gl.glGetFloatv(GL_MODELVIEW_MATRIX,mPosObjTrans);
+	  
+	 repaint();
+    }
+    
+    // entfernt rotationen aus aktueller matrix
+    double Billboard() 
+    {
+	float[] mat=new float[16];
+
+	gl.glGetFloatv(GL_MODELVIEW_MATRIX,mat);
+	mat[0] = mat[5] = mat[10] = 1;
+	mat[1] = mat[2] = mat[4] = mat[6] = mat[8] = mat[9] = 0;
+	gl.glLoadMatrixf(mat);
+
+	return mat[14];
+    }
+    
+    // Methods required for the implementation of MouseListener
+    public void mouseEntered( MouseEvent evt )
+    {
+    }
+
+    public void mouseExited( MouseEvent evt )
+    {
+    }
+
+    public void mousePressed( MouseEvent evt )
+    {
+	if(mouseMoveFlag==false)
+	{   // start drag
+	mouseMoveFlag=true;
+	mousePoint=evt.getPoint();
+	}
+    }
+
+    public void mouseReleased( MouseEvent evt )
+    {
+	mouseMoveFlag=false;
+    }
+
+    public void mouseClicked( MouseEvent evt )
+    {
+	Component comp = evt.getComponent();
+    }
+
+    public void mouseDragged(MouseEvent e)
+    {
+	if(mouseMoveFlag==true)
+	{
+	    oldMousePoint=new Point(mousePoint);
+	    mousePoint=e.getPoint();
+	
+	    Point   dif=new Point(mousePoint.x-oldMousePoint.x,
+				  mousePoint.y-oldMousePoint.y);    
+	    
+	   if(e.isShiftDown()==true)
+	    TranlateObj((float)dif.x/6.0f,(float)dif.y/-6.0f,0f);
+	   else if(e.isAltDown()==true)
+	   {
+	    TranlateObj(0f,0f,(float)dif.y/6.0f);
+	    RotateObj(dif.x,0f,0f,1f);
+	   }
+	   else
+	   {
+	    RotateObj(dif.x,0f,1f,0f);
+	    RotateObj(dif.y,1f,0f,0f);
+	   }
+	}
+    }
+    public void mouseMoved(MouseEvent e)
+    {
+    }
+
+
+}
+
-- 
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