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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.opengl.examples;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.opengl.*;
import org.eclipse.swt.widgets.*;
class BitmapTextTab extends OpenGLTab {
private Text messageText;
private FontData fontData;
private float[] textColor = { 1.0f, 0.0f, 0.0f };
private float xPos = -130.0f, yPos = 0.0f;
private int listIndexBase;
private final static int LIST_INDEX_SIZE = 256;
private final static int DEFAULT_FONT_SIZE = 24;
private final static String DEFAULT_FONT_NAME = "Courier";
/**
* @see OpenGLTab#createControls(Composite)
*/
void createControls(Composite composite) {
Group movementGroup = new Group(composite, SWT.NONE);
movementGroup.setText("Translation");
movementGroup.setLayout(new GridLayout(2, false));
new Label(movementGroup, SWT.NONE).setText("X:");
final Slider xMove = new Slider(movementGroup, SWT.NONE);
xMove.setIncrement(1);
xMove.setMaximum(42);
xMove.setMinimum(0);
xMove.setThumb(2);
xMove.setPageIncrement(2);
xMove.setSelection(7);
xMove.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
xPos = (xMove.getSelection() * 10) - 200;
}
});
new Label(movementGroup, SWT.NONE).setText("Y:");
final Slider yMove = new Slider(movementGroup, SWT.NONE);
yMove.setIncrement(1);
yMove.setMaximum(42);
yMove.setMinimum(0);
yMove.setThumb(2);
yMove.setPageIncrement(2);
yMove.setSelection(20);
yMove.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
yPos = (yMove.getSelection() * 10) - 200;
}
});
Composite textGroup = new Composite(composite,SWT.NONE);
GridLayout layout = new GridLayout(2,false);
layout.marginHeight = 0;
layout.marginWidth = 0;
textGroup.setLayout(layout);
textGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
new Label(textGroup, SWT.NONE).setText("Text:");
messageText = new Text(textGroup, SWT.BORDER);
GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
data.grabExcessHorizontalSpace = true;
messageText.setLayoutData(data);
messageText.setText("OpenGL - SWT");
final Button fontSelectButton = new Button(composite, SWT.NONE);
fontSelectButton.setText("Set Font");
final ColorSelectionGroup colorGroup =
new ColorSelectionGroup(composite, SWT.NONE);
colorGroup.setText("Text color");
colorGroup.addColorSelectionListener(new IColorSelectionListener() {
public void handleColorSelection(RGB rgb) {
GL.glColor3ub((byte) rgb.red, (byte) rgb.green, (byte) rgb.blue);
}
});
fontSelectButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
FontDialog fontDialog = new FontDialog(fontSelectButton.getShell());
fontDialog.setText("Choose Font Options");
double[] currentColor = new double[4];
GL.glGetDoublev(GL.GL_CURRENT_COLOR, currentColor);
fontDialog.setRGB(
new RGB(
(int) currentColor[0] * 255,
(int) currentColor[1] * 255,
(int) currentColor[2] * 255));
fontDialog.setFontData(fontData);
FontData result = fontDialog.open();
if (result != null) {
fontData = result;
RGB rgb = fontDialog.getRGB();
GL.glColor3ub((byte) rgb.red, (byte) rgb.green, (byte) rgb.blue);
colorGroup.setRGB(rgb);
getContext().loadBitmapFont(fontData, null, listIndexBase, 32, 96);
}
}
});
}
/**
* @see OpenGLTab#dispose()
*/
void dispose() {
super.dispose();
GL.glDeleteLists(listIndexBase, LIST_INDEX_SIZE);
}
/**
* Draws the text to the screen
*
* @param string the text to draw
*/
void drawText(String string) {
char[] stringChars = string.toCharArray();
int[] text = new int[stringChars.length];
for (int i = 0; i < text.length; i++) {
text[i] = (int) stringChars[i];
}
// pushes the display list bits
GL.glPushAttrib(GL.GL_LIST_BIT);
// sets the base character to 32
GL.glListBase(listIndexBase - 32);
GL.glCallLists(text.length, GL.GL_UNSIGNED_INT, text);
// pops the display list bits
GL.glPopAttrib();
}
/**
* @see OpenGLTab#getTabText()
*/
String getTabText() {
return "Bitmap Text";
}
/**
* @see OpenGLTab#init()
*/
void init() {
GL.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
GL.glColor3fv(textColor);
GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
GL.glEnable(GL.GL_DEPTH_TEST);
GL.glEnable(GL.GL_BLEND);
// build the initial font
listIndexBase = GL.glGenLists(LIST_INDEX_SIZE);
fontData = new FontData();
fontData.setHeight(DEFAULT_FONT_SIZE);
fontData.setName(DEFAULT_FONT_NAME);
getContext().loadBitmapFont(fontData, null, listIndexBase, 32, LIST_INDEX_SIZE);
}
/**
* @see OpenGLTab#renderScene()
*/
void renderScene() {
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
GL.glLoadIdentity();
GL.glRasterPos2f(xPos, yPos);
drawText(messageText.getText());
}
/**
* @see OpenGLTab#setupViewingArea()
*/
void setupViewingArea() {
// use ortho view since this tab does not need any depth
Rectangle rect = getGlCanvas().getClientArea();
int width = rect.width;
int height = rect.height;
width = Math.max(width, 1);
GL.glViewport(0, 0, width, height);
float nRange = 200.0f;
GL.glMatrixMode(GL.GL_PROJECTION);
GL.glLoadIdentity();
if (width <= height) {
GL.glOrtho(
-nRange, nRange, -nRange * height / width,
nRange * height / width, -nRange, nRange);
} else {
GL.glOrtho(
-nRange * height / width, nRange * height / width, -nRange,
nRange, -nRange, nRange);
}
GL.glMatrixMode(GL.GL_MODELVIEW);
GL.glLoadIdentity();
}
}
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