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package net.java.joglutils.jogltext;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.font.*;
import java.io.*;
import java.text.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;
/**
* This class renders a TrueType Font into OpenGL
*
*@author Davide Raccagni
*@author Erik Tollerud
*@created January 29, 2004
*/
public class DrawTTF extends GLUtessellatorCallbackAdapter {
private GL gl;
public DrawTTF(GL gl) {
this.gl = gl;
}
public void begin(int type) {
gl.glBegin(type);
}
public void vertex(java.lang.Object vertexData) {
double[] coords = (double[])vertexData;
gl.glVertex3dv(coords,0);
}
public void end() {
gl.glEnd();
}
protected void drawString(GLU glu, GL gl) {
try {
Font font = Font.createFont(Font.TRUETYPE_FONT,
new FileInputStream("monotxt_.ttf")).deriveFont(100.0f);
GlyphVector gv = font.createGlyphVector(
new FontRenderContext(new AffineTransform(), true, true),
new StringCharacterIterator("DR"));
GeneralPath gp = (GeneralPath)gv.getOutline();
PathIterator pi = gp.getPathIterator(AffineTransform.getScaleInstance(1.0, -1.0), 1.0f);
tesselate(glu, gl, pi, pi.getWindingRule(), false);
} catch (Exception x) {
}
}
public void draw(GL gl, PathIterator pi) {
boolean closed = false;
for (; !pi.isDone(); pi.next()) {
double[] coords = new double[6];
switch (pi.currentSegment(coords)) {
case PathIterator.SEG_MOVETO:
if (closed) {
gl.glEnd();
closed = false;
}
gl.glBegin(GL.GL_LINE_STRIP);
case PathIterator.SEG_LINETO:
gl.glVertex2d(coords[0], coords[1]);
break;
case PathIterator.SEG_CLOSE:
gl.glEnd();
closed = true;
break;
}
}
if (!closed) {
gl.glEnd();
}
}
public void tesselate(GLU glu, GL gl, PathIterator pi, int windingRule, boolean justBoundary) {
GLUtessellatorCallback aCallback = new DrawTTF(gl);
GLUtessellator tess = glu.gluNewTess();
glu.gluTessCallback(tess, GLU.GLU_TESS_BEGIN, aCallback);
glu.gluTessCallback(tess, GLU.GLU_TESS_END, aCallback);
glu.gluTessCallback(tess, GLU.GLU_TESS_ERROR, aCallback);
glu.gluTessCallback(tess, GLU.GLU_TESS_VERTEX, aCallback);
glu.gluTessCallback(tess, GLU.GLU_TESS_COMBINE, aCallback);
glu.gluTessNormal(tess, 0.0, 0.0, -1.0);
switch (windingRule) {
case PathIterator.WIND_EVEN_ODD:
glu.gluTessProperty(tess, GLU.GLU_TESS_WINDING_RULE, GLU.GLU_TESS_WINDING_ODD);
break;
case PathIterator.WIND_NON_ZERO:
glu.gluTessProperty(tess, GLU.GLU_TESS_WINDING_RULE, GLU.GLU_TESS_WINDING_NONZERO);
break;
}
if (justBoundary) {
glu.gluTessProperty(tess, GLU.GLU_TESS_BOUNDARY_ONLY, GL.GL_TRUE);
} else {
glu.gluTessProperty(tess, GLU.GLU_TESS_BOUNDARY_ONLY, GL.GL_FALSE);
}
glu.gluTessBeginPolygon(tess, (double[])null);
for (; !pi.isDone(); pi.next()) {
double[] coords = new double[6];
switch (pi.currentSegment(coords)) {
case PathIterator.SEG_MOVETO:
glu.gluTessBeginContour(tess);
break;
case PathIterator.SEG_LINETO:
glu.gluTessVertex(tess, coords, 0, coords);
break;
case PathIterator.SEG_CLOSE:
glu.gluTessEndContour(tess);
break;
}
}
glu.gluTessEndPolygon(tess);
}
public static void main(String[] args) {
GLEventListener listener = new GLEventListener() {
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
}
public void init(GLAutoDrawable drawable) {
}
public void display(GLAutoDrawable drawable) {
GL gl = drawable.getGL();
final DrawTTF dttf = new DrawTTF(gl);
gl.glBegin(GL.GL_TRIANGLES);
gl.glVertex2d(0.23,0.89);
gl.glVertex2d(0.35,-0.89);
gl.glVertex2d(0.23,0.1);
gl.glEnd();
dttf.drawString(new GLU(),gl);
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
}
};
net.java.joglutils.GLJFrame gljf = new net.java.joglutils.GLJFrame("title", listener, 200, 200);
gljf.setDefaultCloseOperation(gljf.EXIT_ON_CLOSE);
gljf.setVisible(true);
}
}
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