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author | Grant Gayed | 2010-05-25 14:31:37 +0000 |
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committer | Grant Gayed | 2010-05-25 14:31:37 +0000 |
commit | b4425fad97f687142149c06268c8d177bde16393 (patch) | |
tree | b4b69131600af3b15098b26ec8b057167adf3ae7 /examples/org.eclipse.swt.snippets/src | |
parent | 17410f7b46e9a9f6d9854c5157b159a2d3892f53 (diff) | |
download | eclipse.platform.swt-b4425fad97f687142149c06268c8d177bde16393.tar.gz eclipse.platform.swt-b4425fad97f687142149c06268c8d177bde16393.tar.xz eclipse.platform.swt-b4425fad97f687142149c06268c8d177bde16393.zip |
initial
Diffstat (limited to 'examples/org.eclipse.swt.snippets/src')
-rw-r--r-- | examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet341.java | 183 |
1 files changed, 183 insertions, 0 deletions
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 new file mode 100644 index 0000000000..71d7c0de71 --- /dev/null +++ b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet341.java @@ -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(); + } + }); + } +} |