/* * Copyright (c) 2006 Erik Tollerud (erik.tollerud@gmail.com) All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * - Redistribution of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistribution in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * The names of Erik Tollerud, Davide Raccagni, Sun Microsystems, Inc. or the names of * contributors may not be used to endorse or promote products derived from * this software without specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. ERIK TOLLERUD, * SUN MICROSYSTEMS, INC. ("SUN"), AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL ERIK * TOLLERUD, SUN, OR SUN'S LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT * OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF ERIK * TOLLERUD OR SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed or intended for use * in the design, construction, operation or maintenance of any nuclear * facility. */ package net.java.joglutils.jogltext; import java.awt.*; import java.awt.geom.*; import java.awt.font.*; import java.text.*; import javax.media.opengl.*; import javax.media.opengl.glu.*; /** * This class renders a TrueType Font into OpenGL * *@author Davide Raccagni *@author Erik Tollerud *@created January 29, 2004 */ public class FontDrawer { public enum NormalMode {NONE, FLAT, AVERAGED}; private Font font; private float depth; private boolean edgeOnly; private NormalMode normalMode; /** * Intstantiates a new FontDrawer initially rendering in the specified font. * @param font the initial font for this FontDrawer */ public FontDrawer(Font font) { this.font = font; depth = 0; edgeOnly = false; normalMode = NormalMode.FLAT; } /** * Specifies which font to render with this FontDrawer * @param font a font to use for rendering */ public void setFont(Font font) { this.font = font; } /** * Retrieves the Font currently associated with this FontDrawer * @return the Font in which this object renders strings */ public Font getFont() { return this.font; } /** * Determines how long the sides of the rendered text is. In the special case of 0, the rendering is 2D. * @param depth specifies the z-size of the rendered 3D text. Negative numbers will be set to 0. */ public void setDepth(float depth) { if (depth <= 0) this.depth = 0; else this.depth = depth; } /** * Retrieves the z-depth used for this FontDrawer's text rendering. * @return the z-depth of the rendered 3D text. */ public float getDepth() { return this.depth; } /** * Sets if the text should be rendered as filled polygons or wireframe. * @param fill if true, uses filled polygons, if false, renderings are wireframe. */ public void setFill(boolean fill) { this.edgeOnly = !fill; } /** * Determines if the text is being rendered as filled polygons or wireframes. * @return if true, uses filled polygons, if false, renderings are wireframe. */ public boolean isFill() { return !this.edgeOnly; } /** * Sets technique for rendering Normals. Available options: * None: Performs no calls to glNormal* - best performance * Flat: Computes the normal as pointing straight away from the text face. * Averaged: Determines side edge normals as the average direction of the two sides (smoother shading). Faces are still flat. * * @param mode the mode to render in. Default is flat. */ public void setNormal( NormalMode mode ) { this.normalMode = mode; } /** * Determines which normal-calculation technique is being used. * @see setNormal * @return the normal technique for this FontDrawer. */ public NormalMode getNormal() { return this.normalMode; } /** * Renders a string into the specified GL object, starting at the (0,0,0) point in OpenGL coordinates. * Note that this creates a new GLU instance everytime it is called, which will negatively impact performance. * * @param str the string to render. * @param gl the OpenGL context in which to render the text. */ public void drawString(String str, GL gl) { drawString(str,new GLU(),gl); } /** * Renders a string into the specified GL object, starting at the (0,0,0) point in OpenGL coordinates. * * @param str the string to render. * @param glu a GLU instance to use for the text rendering (provided to prevent continuous re-instantiation of a GLU object) * @param gl the OpenGL context in which to render the text. */ public void drawString(String str, GLU glu, GL gl) { GlyphVector gv = font.createGlyphVector( new FontRenderContext(new AffineTransform(), true, true), new StringCharacterIterator(str)); GeneralPath gp = (GeneralPath)gv.getOutline(); PathIterator pi = gp.getPathIterator(AffineTransform.getScaleInstance(1.0, -1.0), 1.0f); if (this.normalMode != NormalMode.NONE) gl.glNormal3f(0,0,-1.0f); tesselateFace(glu, gl, pi, pi.getWindingRule(), this.edgeOnly); if (this.depth != 0.0) { pi = gp.getPathIterator(AffineTransform.getScaleInstance(1.0, -1.0), 1.0f); if (this.normalMode != NormalMode.NONE) gl.glNormal3f(0,0,1.0f); tesselateFace(glu, gl, pi, pi.getWindingRule(), this.edgeOnly, this.depth); pi = gp.getPathIterator(AffineTransform.getScaleInstance(1.0, -1.0), 1.0f); switch (this.normalMode) { //TODO: add diagonal corner/VBO technique case NONE: drawSidesNoNorm(gl,pi,this.edgeOnly,this.depth); break; case FLAT: drawSidesFlatNorm(gl,pi,this.edgeOnly,this.depth); break; case AVERAGED: drawSidesAvgNorm(gl,pi,this.edgeOnly,this.depth); break; } } } /** * Renders a string into the specified GL object, starting at the (xOff,yOff,zOff) point in OpenGL coordinates. * Note that this creates a new GLU instance everytime it is called, which will negatively impact performance. * * @param xOff the distance to translate the text in the x-direction * @param yOff the distance to translate the text in the y-direction * @param zOff the distance to translate the text in the z-direction * @param str the string to render. * @param gl the OpenGL context in which to render the text. */ public void drawString(String str, GL gl, float xOff, float yOff, float zOff) { drawString(str,new GLU(),gl,xOff,yOff,zOff); } /** * Renders a string into the specified GL object, starting at the (xOff,yOff,zOff) point in OpenGL coordinates. * * @param xOff the distance to translate the text in the x-direction * @param yOff the distance to translate the text in the y-direction * @param zOff the distance to translate the text in the z-direction * @param str the string to render. * @param glu a GLU instance to use for the text rendering (provided to prevent continuous re-instantiation of a GLU object) * @param gl the OpenGL context in which to render the text. */ public void drawString(String str, GLU glu, GL gl, float xOff, float yOff, float zOff) { gl.glPushAttrib(GL.GL_TRANSFORM_BIT); gl.glMatrixMode(GL.GL_MODELVIEW); gl.glPushMatrix(); gl.glTranslatef(xOff,yOff,zOff); this.drawString(str,glu,gl); gl.glPopMatrix(); gl.glPopAttrib(); } private void tesselateFace(GLU glu, GL gl, PathIterator pi, int windingRule, boolean justBoundary) { tesselateFace(glu,gl,pi,windingRule,justBoundary,0); } private void tesselateFace(GLU glu, GL gl, PathIterator pi, int windingRule, boolean justBoundary,double tessZ) { GLUtessellatorCallback aCallback = new GLUtesselatorCallbackImpl(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[3]; coords[2] = tessZ; 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); glu.gluDeleteTess(tess); } private void drawSidesNoNorm(GL gl, PathIterator pi, boolean justBoundary,float tessZ) { //TODO: texture coords if (justBoundary) gl.glPolygonMode(GL.GL_FRONT_AND_BACK,GL.GL_LINE); else gl.glPolygonMode(GL.GL_FRONT_AND_BACK,GL.GL_FILL); for(float[] coords = new float[6];!pi.isDone();pi.next()) { float[] currRender = new float[3]; switch(pi.currentSegment(coords)) { case PathIterator.SEG_MOVETO: gl.glBegin(GL.GL_QUAD_STRIP); currRender[0] = coords[0]; currRender[1] = coords[1]; currRender[2] = 0; gl.glVertex3fv(currRender,0); currRender[2] = tessZ; gl.glVertex3fv(currRender,0); break; case PathIterator.SEG_LINETO: currRender[0] = coords[0]; currRender[1] = coords[1]; currRender[2] = 0; gl.glVertex3fv(currRender,0); currRender[2] = tessZ; gl.glVertex3fv(currRender,0); break; case PathIterator.SEG_CLOSE: currRender[0] = coords[0]; currRender[1] = coords[1]; currRender[2] = 0; gl.glVertex3fv(currRender,0); currRender[2] = tessZ; gl.glVertex3fv(currRender,0); gl.glEnd(); break; default: throw new JogltextException("PathIterator segment not SEG_MOVETO, SEG_LINETO, SEG_CLOSE; Inappropriate font."); } } } private void drawSidesFlatNorm(GL gl, PathIterator pi, boolean justBoundary,float tessZ) { //TODO: texture coords if (justBoundary) gl.glPolygonMode(GL.GL_FRONT_AND_BACK,GL.GL_LINE); else gl.glPolygonMode(GL.GL_FRONT_AND_BACK,GL.GL_FILL); float[] lastCoord = new float[3]; float[] firstCoord = new float[3]; for(float[] coords = new float[6];!pi.isDone();pi.next()) { switch(pi.currentSegment(coords)) { case PathIterator.SEG_MOVETO: gl.glBegin(GL.GL_QUADS); lastCoord[0] = coords[0]; lastCoord[1] = coords[1]; firstCoord[0] = coords[0]; firstCoord[1] = coords[1]; break; case PathIterator.SEG_LINETO: //Normal: {deltay,-deltax,0} gl.glNormal3f(lastCoord[1]-coords[1],coords[0]-lastCoord[0],0); lastCoord[2] = 0; gl.glVertex3fv(lastCoord,0); lastCoord[2] = tessZ; gl.glVertex3fv(lastCoord,0); coords[2] = tessZ; gl.glVertex3fv(coords,0); coords[2] = 0; gl.glVertex3fv(coords,0); lastCoord[0] = coords[0]; lastCoord[1] = coords[1]; break; case PathIterator.SEG_CLOSE: //Normal: {deltay,-deltax,0} gl.glNormal3f(lastCoord[1]-firstCoord[1],firstCoord[0]-lastCoord[0],0); lastCoord[2] = 0; gl.glVertex3fv(lastCoord,0); lastCoord[2] = tessZ; gl.glVertex3fv(lastCoord,0); firstCoord[2] = tessZ; gl.glVertex3fv(firstCoord,0); firstCoord[2] = 0; gl.glVertex3fv(firstCoord,0); gl.glEnd(); break; default: throw new JogltextException("PathIterator segment not SEG_MOVETO, SEG_LINETO, SEG_CLOSE; Inappropriate font."); } } } private void drawSidesAvgNorm(GL gl, PathIterator pi, boolean justBoundary,float tessZ) { //TODO: improve performance with some form of caching? //TODO: texture coords //TODO: check last coord - might not quite be correct? if (justBoundary) gl.glPolygonMode(GL.GL_FRONT_AND_BACK,GL.GL_LINE); else gl.glPolygonMode(GL.GL_FRONT_AND_BACK,GL.GL_FILL); float[] firstCoord = null; float[] secondCoord = null; float[] thirdCoord = null; float[] twoBackCoord = null; float[] oneBackCoord = null; for(float[] coords = new float[6];!pi.isDone();pi.next()) { switch(pi.currentSegment(coords)) { case PathIterator.SEG_MOVETO: firstCoord = new float[3]; firstCoord[0] = coords[0]; firstCoord[1] = coords[1]; gl.glBegin(GL.GL_QUAD_STRIP); break; case PathIterator.SEG_LINETO: if (secondCoord == null) { secondCoord = new float[3]; secondCoord[0] = coords[0]; secondCoord[1] = coords[1]; twoBackCoord = firstCoord.clone(); oneBackCoord = secondCoord.clone(); } else { float avgdeltax = oneBackCoord[0] - twoBackCoord[0] + coords[0] - oneBackCoord[0]; float avgdeltay = oneBackCoord[1] - twoBackCoord[1] + coords[1] - oneBackCoord[1]; if (thirdCoord == null) { thirdCoord = new float[3]; thirdCoord[0] = coords[0]; thirdCoord[1] = coords[1]; } gl.glNormal3f(-avgdeltay,avgdeltax,0); oneBackCoord[2] = 0.0f; gl.glVertex3fv(oneBackCoord,0); oneBackCoord[2] = tessZ; gl.glVertex3fv(oneBackCoord,0); //copy to not have to recreate twoBackCoord[0] = oneBackCoord[0]; twoBackCoord[1] = oneBackCoord[1]; oneBackCoord[0] = coords[0]; oneBackCoord[1] = coords[1]; } break; case PathIterator.SEG_CLOSE: float avgdeltax = oneBackCoord[0] - twoBackCoord[0] + firstCoord[0] - oneBackCoord[0]; float avgdeltay = oneBackCoord[1] - twoBackCoord[1] + firstCoord[1] - oneBackCoord[1]; gl.glNormal3f(-avgdeltay,avgdeltax,0); oneBackCoord[2] = 0.0f; gl.glVertex3fv(oneBackCoord,0); oneBackCoord[2] = tessZ; gl.glVertex3fv(oneBackCoord,0); avgdeltax = firstCoord[0] - oneBackCoord[0] + secondCoord[0] - firstCoord[0]; avgdeltay = firstCoord[1] - oneBackCoord[1] + secondCoord[1] - firstCoord[1]; gl.glNormal3f(-avgdeltay,avgdeltax,0); firstCoord[2] = 0.0f; gl.glVertex3fv(firstCoord,0); firstCoord[2] = tessZ; gl.glVertex3fv(firstCoord,0); avgdeltax = secondCoord[0] - firstCoord[0] + thirdCoord[0] - secondCoord[0]; avgdeltay = secondCoord[1] - firstCoord[1] + thirdCoord[1] - secondCoord[1]; gl.glNormal3f(-avgdeltay,avgdeltax,0); secondCoord[2] = 0.0f; gl.glVertex3fv(secondCoord,0); secondCoord[2] = tessZ; gl.glVertex3fv(secondCoord,0); gl.glEnd(); firstCoord = null; secondCoord = null; thirdCoord = null; twoBackCoord = null; oneBackCoord = null; break; default: throw new JogltextException("PathIterator segment not SEG_MOVETO, SEG_LINETO, SEG_CLOSEE; Inappropriate font."); } } } private class GLUtesselatorCallbackImpl extends javax.media.opengl.glu.GLUtessellatorCallbackAdapter { private GL gl; public GLUtesselatorCallbackImpl(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(); } } }