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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.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.opengl.*;
import org.eclipse.swt.widgets.*;
class BezierTab extends SelectionTab {
private boolean showCtrlPoints = true;
private Point offset;
private int currentPoint = -1;
private int lineDivisions = 30;
private double[][] ctrlPts = {
{ 1.5, 0.5, 0.0, 0.6, 0.9, 0.0, 0.85, 0.12,
0.0, 1.1, 1.0, 0.0, 0.53, 1.4, 0.0
},
{ 0.53, 1.4, 0.0, 1.03, 1.87, 0.0, 1.52, 0.26,
0.0, 1.86, 0.43, 0.0, 1.5, 0.5, 0.0
}
};
private static final int LENGTH = 5;
private static final int[][] PICK_NAMES = {
{ 1, 2, 3, 4, 5 },
{ 6, 7, 8, 9, 10 }
};
/**
* @see OpenGLTab#createControls(Composite)
*/
void createControls(Composite composite) {
new Label(composite, SWT.NONE).setText("Click and drag points to adjust shape.");
new Label(composite, SWT.NONE).setText("Line division count:");
final Slider divisions = new Slider(composite, SWT.NONE);
divisions.setIncrement(1);
divisions.setMaximum(52);
divisions.setMinimum(1);
divisions.setThumb(2);
divisions.setPageIncrement(2);
divisions.setSelection(30);
divisions.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
lineDivisions = divisions.getSelection();
}
});
final Button showPointsButton = new Button(composite, SWT.CHECK);
showPointsButton.setText("Show Points");
showPointsButton.setSelection(true);
showPointsButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
showCtrlPoints = showPointsButton.getSelection();
}
});
final Button blendButton = new Button(composite, SWT.CHECK);
blendButton.setText("Blend");
blendButton.setSelection(true);
blendButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
if (blendButton.getSelection()) {
GL.glEnable(GL.GL_BLEND);
} else {
GL.glDisable(GL.GL_BLEND);
}
}
});
final Button smoothLineButton = new Button(composite, SWT.CHECK);
smoothLineButton.setText("Smooth Line");
smoothLineButton.setSelection(true);
smoothLineButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
if (smoothLineButton.getSelection()) {
GL.glEnable(GL.GL_LINE_SMOOTH);
} else {
GL.glDisable(GL.GL_LINE_SMOOTH);
}
}
});
final Canvas glCanvas = getGlCanvas();
glCanvas.addMouseListener(new MouseAdapter() {
public void mouseUp(MouseEvent e) {
offset = null;
}
});
glCanvas.addListener(SWT.MouseDown, new Listener() {
public void handleEvent(Event e) {
e.y = glCanvas.getClientArea().height - e.y;
if (e.button == 1) {
if (processSelection(e.x, e.y, 10) > 0) {
offset = new Point(e.x, e.y);
} else {
currentPoint = 0;
}
}
}
});
glCanvas.addListener(SWT.MouseMove, new Listener() {
public void handleEvent(Event e) {
if (offset == null) return;
int currentSegment = (currentPoint - 1) / LENGTH;
int current = (currentPoint - 1) * 3;
if (currentPoint > LENGTH) {
current = (currentPoint - 6) * 3;
}
Rectangle rect = glCanvas.getClientArea();
e.y = rect.height - e.y;
if (0 < e.x && e.x < rect.width && 0 < e.y && e.y < rect.height && currentPoint > 0) {
ctrlPts[currentSegment][current] = (float) e.x / (float) 200;
ctrlPts[currentSegment][current + 1] = (float) e.y / (float) 200;
switch (currentPoint) {
case 10 :
ctrlPts[0][0] = (float) e.x / (float) 200;
ctrlPts[0][1] = (float) e.y / (float) 200;
break;
case 6 :
ctrlPts[0][12] = (float) e.x / (float) 200;
ctrlPts[0][13] = (float) e.y / (float) 200;
break;
}
}
}
});
}
/**
* @see OpenGLTab#getTabText()
*/
String getTabText() {
return "Bezier";
}
/**
* @see OpenGLTab#init()
*/
void init() {
GL.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
GL.glHint(GL.GL_LINE_SMOOTH_HINT, GL.GL_NICEST);
GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
GL.glPointSize(7.0f);
GL.glLineWidth(4.0f);
GL.glEnable(GL.GL_AUTO_NORMAL);
GL.glEnable(GL.GL_MAP1_VERTEX_3);
GL.glEnable(GL.GL_LINE_SMOOTH);
GL.glEnable(GL.GL_BLEND);
}
/**
* @see SelectionTab.processPick (int[], int)
*/
void processPick(int[] pSelectBuff, int hits) {
int counter = 0;
currentPoint = 0;
for (int i = 0; i < hits; i++) {
int count = pSelectBuff[counter];
counter += 3;
for (int j = 0; j < count; j++) {
currentPoint = pSelectBuff[counter];
counter++;
}
}
}
/**
* @see OpenGLTab#renderScene()
*/
void renderScene() {
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
GL.glLoadIdentity();
GL.glTranslatef(-1.0f, -1.0f, -2.45f);
GL.glColor3f(0.0f, 0.0f, 1.0f);
for (int i = 0; i < ctrlPts.length; i++) {
GL.glMapGrid1d(lineDivisions, 0.0f, 1f);
GL.glMap1d(GL.GL_MAP1_VERTEX_3, 0, 1, 3, LENGTH, ctrlPts[i]);
GL.glEvalMesh1(GL.GL_LINE, 0, lineDivisions);
}
if (showCtrlPoints) {
GL.glPushName(0);
for (int j = 0; j < ctrlPts.length; j++) {
for (int i = 0; i < LENGTH * 3; i += 3) {
GL.glLoadName(PICK_NAMES[j][i / 3]);
GL.glBegin(GL.GL_POINTS);
if (PICK_NAMES[j][i / 3] == currentPoint) {
GL.glColor3f(1.0f, 0.0f, 0.0f);
} else {
GL.glColor3f(0.0f, 0.0f, 0.0f);
}
GL.glVertex3d(ctrlPts[j][i], ctrlPts[j][i + 1], ctrlPts[j][i + 2]);
GL.glEnd();
}
}
}
}
}
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