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/*******************************************************************************
* 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.graphics;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.gdip.*;
import org.eclipse.swt.internal.win32.*;
/**
* Instances of this class represent patterns to use while drawing. Patterns
* can be specified either as bitmaps or gradients.
* <p>
* Application code must explicitly invoke the <code>Pattern.dispose()</code>
* method to release the operating system resources managed by each instance
* when those instances are no longer required.
* </p>
* <p>
* This class requires the operating system's advanced graphics subsystem
* which may not be available on some platforms.
* </p>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#path">Path, Pattern snippets</a>
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.1
*/
public class Pattern extends Resource {
/**
* the OS resource for the Pattern
* (Warning: This field is platform dependent)
* <p>
* <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
* </p>
*
* @noreference This field is not intended to be referenced by clients.
*/
public int /*long*/ handle;
/**
* Constructs a new Pattern given an image. Drawing with the resulting
* pattern will cause the image to be tiled over the resulting area.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param device the device on which to allocate the pattern
* @param image the image that the pattern will draw
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device, or the image is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle for the pattern could not be obtained</li>
* </ul>
*
* @see #dispose()
*/
public Pattern(Device device, Image image) {
super(device);
if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
this.device.checkGDIP();
int /*long*/[] gdipImage = image.createGdipImage();
int /*long*/ img = gdipImage[0];
int width = Gdip.Image_GetWidth(img);
int height = Gdip.Image_GetHeight(img);
handle = Gdip.TextureBrush_new(img, Gdip.WrapModeTile, 0, 0, width, height);
Gdip.Bitmap_delete(img);
if (gdipImage[1] != 0) {
int /*long*/ hHeap = OS.GetProcessHeap ();
OS.HeapFree(hHeap, 0, gdipImage[1]);
}
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
init();
}
/**
* Constructs a new Pattern that represents a linear, two color
* gradient. Drawing with the pattern will cause the resulting area to be
* tiled with the gradient specified by the arguments.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param device the device on which to allocate the pattern
* @param x1 the x coordinate of the starting corner of the gradient
* @param y1 the y coordinate of the starting corner of the gradient
* @param x2 the x coordinate of the ending corner of the gradient
* @param y2 the y coordinate of the ending corner of the gradient
* @param color1 the starting color of the gradient
* @param color2 the ending color of the gradient
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device,
* or if either color1 or color2 is null</li>
* <li>ERROR_INVALID_ARGUMENT - if either color1 or color2 has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle for the pattern could not be obtained</li>
* </ul>
*
* @see #dispose()
*/
public Pattern(Device device, float x1, float y1, float x2, float y2, Color color1, Color color2) {
this(device, x1, y1, x2, y2, color1, 0xFF, color2, 0xFF);
}
/**
* Constructs a new Pattern that represents a linear, two color
* gradient. Drawing with the pattern will cause the resulting area to be
* tiled with the gradient specified by the arguments.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param device the device on which to allocate the pattern
* @param x1 the x coordinate of the starting corner of the gradient
* @param y1 the y coordinate of the starting corner of the gradient
* @param x2 the x coordinate of the ending corner of the gradient
* @param y2 the y coordinate of the ending corner of the gradient
* @param color1 the starting color of the gradient
* @param alpha1 the starting alpha value of the gradient
* @param color2 the ending color of the gradient
* @param alpha2 the ending alpha value of the gradient
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device,
* or if either color1 or color2 is null</li>
* <li>ERROR_INVALID_ARGUMENT - if either color1 or color2 has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle for the pattern could not be obtained</li>
* </ul>
*
* @see #dispose()
*
* @since 3.2
*/
public Pattern(Device device, float x1, float y1, float x2, float y2, Color color1, int alpha1, Color color2, int alpha2) {
super(device);
if (color1 == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (color1.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (color2 == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (color2.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
this.device.checkGDIP();
int colorRef1 = color1.handle;
int rgb = ((colorRef1 >> 16) & 0xFF) | (colorRef1 & 0xFF00) | ((colorRef1 & 0xFF) << 16);
int /*long*/ foreColor = Gdip.Color_new((alpha1 & 0xFF) << 24 | rgb);
if (x1 == x2 && y1 == y2) {
handle = Gdip.SolidBrush_new(foreColor);
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
} else {
int colorRef2 = color2.handle;
rgb = ((colorRef2 >> 16) & 0xFF) | (colorRef2 & 0xFF00) | ((colorRef2 & 0xFF) << 16);
int /*long*/ backColor = Gdip.Color_new((alpha2 & 0xFF) << 24 | rgb);
PointF p1 = new PointF();
p1.X = x1;
p1.Y = y1;
PointF p2 = new PointF();
p2.X = x2;
p2.Y = y2;
handle = Gdip.LinearGradientBrush_new(p1, p2, foreColor, backColor);
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
if (alpha1 != 0xFF || alpha2 != 0xFF) {
int a = (int)((alpha1 & 0xFF) * 0.5f + (alpha2 & 0xFF) * 0.5f);
int r = (int)(((colorRef1 & 0xFF) >> 0) * 0.5f + ((colorRef2 & 0xFF) >> 0) * 0.5f);
int g = (int)(((colorRef1 & 0xFF00) >> 8) * 0.5f + ((colorRef2 & 0xFF00) >> 8) * 0.5f);
int b = (int)(((colorRef1 & 0xFF0000) >> 16) * 0.5f + ((colorRef2 & 0xFF0000) >> 16) * 0.5f);
int /*long*/ midColor = Gdip.Color_new(a << 24 | r << 16 | g << 8 | b);
Gdip.LinearGradientBrush_SetInterpolationColors(handle, new int /*long*/ []{foreColor, midColor, backColor}, new float[]{0, 0.5f, 1}, 3);
Gdip.Color_delete(midColor);
}
Gdip.Color_delete(backColor);
}
Gdip.Color_delete(foreColor);
init();
}
void destroy() {
int type = Gdip.Brush_GetType(handle);
switch (type) {
case Gdip.BrushTypeSolidColor:
Gdip.SolidBrush_delete(handle);
break;
case Gdip.BrushTypeHatchFill:
Gdip.HatchBrush_delete(handle);
break;
case Gdip.BrushTypeLinearGradient:
Gdip.LinearGradientBrush_delete(handle);
break;
case Gdip.BrushTypeTextureFill:
Gdip.TextureBrush_delete(handle);
break;
}
handle = 0;
}
/**
* Returns <code>true</code> if the Pattern has been disposed,
* and <code>false</code> otherwise.
* <p>
* This method gets the dispose state for the Pattern.
* When a Pattern has been disposed, it is an error to
* invoke any other method (except {@link #dispose()}) using the Pattern.
*
* @return <code>true</code> when the Pattern is disposed, and <code>false</code> otherwise
*/
public boolean isDisposed() {
return handle == 0;
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
public String toString() {
if (isDisposed()) return "Pattern {*DISPOSED*}";
return "Pattern {" + handle + "}";
}
}
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