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authorGrant Gayed2010-05-25 14:31:37 +0000
committerGrant Gayed2010-05-25 14:31:37 +0000
commitb4425fad97f687142149c06268c8d177bde16393 (patch)
treeb4b69131600af3b15098b26ec8b057167adf3ae7 /examples/org.eclipse.swt.snippets/src
parent17410f7b46e9a9f6d9854c5157b159a2d3892f53 (diff)
downloadeclipse.platform.swt-b4425fad97f687142149c06268c8d177bde16393.tar.gz
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initial
Diffstat (limited to 'examples/org.eclipse.swt.snippets/src')
-rw-r--r--examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet341.java183
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diff --git a/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet341.java b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet341.java
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@@ -0,0 +1,183 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2010 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.snippets;
+
+/*
+ * SWT OpenGL snippet: capture a LWJGL drawing to an SWT Image
+ *
+ * For a list of all SWT example snippets see
+ * http://www.eclipse.org/swt/snippets/
+ *
+ * @since 3.2
+ */
+import java.nio.ByteBuffer;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.layout.*;
+import org.eclipse.swt.widgets.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.opengl.GLCanvas;
+import org.eclipse.swt.opengl.GLData;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GLContext;
+import org.lwjgl.util.glu.GLU;
+import org.lwjgl.LWJGLException;
+
+public class Snippet341 {
+ static void drawTorus(float r, float R, int nsides, int rings) {
+ float ringDelta = 2.0f * (float) Math.PI / rings;
+ float sideDelta = 2.0f * (float) Math.PI / nsides;
+ float theta = 0.0f, cosTheta = 1.0f, sinTheta = 0.0f;
+ for (int i = rings - 1; i >= 0; i--) {
+ float theta1 = theta + ringDelta;
+ float cosTheta1 = (float) Math.cos(theta1);
+ float sinTheta1 = (float) Math.sin(theta1);
+ GL11.glBegin(GL11.GL_QUAD_STRIP);
+ float phi = 0.0f;
+ for (int j = nsides; j >= 0; j--) {
+ phi += sideDelta;
+ float cosPhi = (float) Math.cos(phi);
+ float sinPhi = (float) Math.sin(phi);
+ float dist = R + r * cosPhi;
+ GL11.glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
+ GL11.glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
+ GL11.glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
+ GL11.glVertex3f(cosTheta * dist, -sinTheta * dist, r * sinPhi);
+ }
+ GL11.glEnd();
+ theta = theta1;
+ cosTheta = cosTheta1;
+ sinTheta = sinTheta1;
+ }
+ }
+
+ public static void main(String [] args) {
+ final Display display = new Display();
+ Shell shell = new Shell(display);
+ shell.setLayout(new GridLayout());
+ GLData data = new GLData ();
+ data.doubleBuffer = true;
+ final GLCanvas canvas = new GLCanvas(shell, SWT.NONE, data);
+ canvas.setLayoutData(new GridData(640,480));
+
+ canvas.setCurrent();
+ try {
+ GLContext.useContext(canvas);
+ } catch(LWJGLException e) { e.printStackTrace(); }
+
+ canvas.addListener(SWT.Resize, new Listener() {
+ public void handleEvent(Event event) {
+ Rectangle bounds = canvas.getBounds();
+ float fAspect = (float) bounds.width / (float) bounds.height;
+ canvas.setCurrent();
+ try {
+ GLContext.useContext(canvas);
+ } catch(LWJGLException e) { e.printStackTrace(); }
+ GL11.glViewport(0, 0, bounds.width, bounds.height);
+ GL11.glMatrixMode(GL11.GL_PROJECTION);
+ GL11.glLoadIdentity();
+ GLU.gluPerspective(45.0f, fAspect, 0.5f, 400.0f);
+ GL11.glMatrixMode(GL11.GL_MODELVIEW);
+ GL11.glLoadIdentity();
+ }
+ });
+
+ GL11.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+ GL11.glColor3f(1.0f, 0.0f, 0.0f);
+ GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);
+ GL11.glClearDepth(1.0);
+ GL11.glLineWidth(2);
+ GL11.glEnable(GL11.GL_DEPTH_TEST);
+
+ Button button = new Button(shell, SWT.PUSH);
+ button.setText("Capture");
+ button.addListener(SWT.Selection, new Listener() {
+ public void handleEvent(Event event) {
+ capture(canvas);
+ }
+ });
+ shell.pack();
+ shell.open();
+
+ display.asyncExec(new Runnable() {
+ int rot = 0;
+ public void run() {
+ if (!canvas.isDisposed()) {
+ canvas.setCurrent();
+ try {
+ GLContext.useContext(canvas);
+ } catch(LWJGLException e) { e.printStackTrace(); }
+ GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
+ GL11.glClearColor(.3f, .5f, .8f, 1.0f);
+ GL11.glLoadIdentity();
+ GL11.glTranslatef(0.0f, 0.0f, -10.0f);
+ float frot = rot;
+ GL11.glRotatef(0.15f * rot, 2.0f * frot, 10.0f * frot, 1.0f);
+ GL11.glRotatef(0.3f * rot, 3.0f * frot, 1.0f * frot, 1.0f);
+ rot++;
+ GL11.glPolygonMode(GL11.GL_FRONT_AND_BACK, GL11.GL_LINE);
+ GL11.glColor3f(0.9f, 0.9f, 0.9f);
+ drawTorus(1, 1.9f + ((float) Math.sin((0.004f * frot))), 15, 15);
+ canvas.swapBuffers();
+ display.asyncExec(this);
+ }
+ }
+ });
+
+ while (!shell.isDisposed()) {
+ if (!display.readAndDispatch())
+ display.sleep();
+ }
+ display.dispose();
+ }
+
+ static void capture(GLCanvas glCanvas) {
+ final int PAD = 4;
+ Display display = glCanvas.getDisplay();
+ Rectangle bounds = glCanvas.getBounds();
+ int size = bounds.width * PAD * bounds.height;
+
+ ByteBuffer buffer = ByteBuffer.allocateDirect(size);
+ GL11.glReadPixels(0, 0, bounds.width, bounds.height, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer);
+ byte[] bytes = new byte[size];
+ buffer.get(bytes);
+ /*
+ * In OpenGL (0,0) is at the bottom-left corner, and y values ascend in the upward
+ * direction. This is opposite to SWT which defines (0,0) to be at the top-left
+ * corner with y values ascendingin the downwards direction. Re-order the OpenGL-
+ * provided bytes to SWT's expected order so that the Image will not appear inverted.
+ */
+ byte[] temp = new byte[bytes.length];
+ for (int i = 0; i < bytes.length; i += bounds.width * PAD) {
+ System.arraycopy(bytes, bytes.length - i - bounds.width * PAD, temp, i, bounds.width * PAD);
+ }
+ bytes = temp;
+ ImageData data = new ImageData(bounds.width, bounds.height, 32, new PaletteData(0xFF000000, 0xFF0000, 0xFF00), PAD, bytes);
+ final Image image = new Image(display, data);
+
+ Shell shell = new Shell(display);
+ shell.setLayout(new GridLayout());
+ Canvas canvas = new Canvas(shell, SWT.NONE);
+ canvas.setLayoutData(new GridData(bounds.width, bounds.height));
+ canvas.addListener(SWT.Paint, new Listener() {
+ public void handleEvent(Event event) {
+ event.gc.drawImage(image, 0, 0);
+ }
+ });
+ shell.pack();
+ shell.open();
+ shell.addListener(SWT.Dispose, new Listener() {
+ public void handleEvent(Event event) {
+ image.dispose();
+ }
+ });
+ }
+}

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