imageanalyzer.java

SWT开发例子

	 */
	void scaleX() {
		try {
			xscale = Float.parseFloat(scaleXCombo.getText());
		} catch (NumberFormatException e) {
			xscale = 1;
			scaleXCombo.select(scaleXCombo.indexOf("1"));
		}
		if (image != null) {
			resizeScrollBars();
			imageCanvas.redraw();
		}
	}
	
	/*
	 * Called when the ScaleY combo selection changes.
	 */
	void scaleY() {
		try {
			yscale = Float.parseFloat(scaleYCombo.getText());
		} catch (NumberFormatException e) {
			yscale = 1;
			scaleYCombo.select(scaleYCombo.indexOf("1"));
		}
		if (image != null) {
			resizeScrollBars();
			imageCanvas.redraw();
		}
	}
	
	/*
	 * Called when the Alpha combo selection changes.
	 */
	void alpha() {
		try {
			alpha = Integer.parseInt(alphaCombo.getText());
		} catch (NumberFormatException e) {
			alphaCombo.select(alphaCombo.indexOf("255"));
			alpha = 255;
		}
	}
	
	/*
	 * Called when the mouse moves in the image canvas.
	 * Show the color of the image at the point under the mouse.
	 */
	void showColorAt(int mx, int my) {
		int x = mx - imageData.x - ix;
		int y = my - imageData.y - iy;
		showColorForPixel(x, y);
	}
	
	/*
	 * Called when a mouse down or key press is detected
	 * in the data text. Show the color of the pixel at
	 * the caret position in the data text.
	 */
	void showColorForData() {
		int delimiterLength = dataText.getLineDelimiter().length();
		int charactersPerLine = 6 + 3 * imageData.bytesPerLine + delimiterLength;
		int position = dataText.getCaretOffset();
		int y = position / charactersPerLine;
		if ((position - y * charactersPerLine) < 6 || ((y + 1) * charactersPerLine - position) <= delimiterLength) {
			statusLabel.setText("");
			return;
		}
		int dataPosition = position - 6 * (y + 1) - delimiterLength * y;
		int byteNumber = dataPosition / 3;
		int where = dataPosition - byteNumber * 3;
		int xByte = byteNumber % imageData.bytesPerLine;
		int x = -1;
		int depth = imageData.depth;
		if (depth == 1) { // 8 pixels per byte (can only show 3 of 8)
			if (where == 0) x = xByte * 8;
			if (where == 1) x = xByte * 8 + 3;
			if (where == 2) x = xByte * 8 + 7;
		}
		if (depth == 2) { // 4 pixels per byte (can only show 3 of 4)
			if (where == 0) x = xByte * 4;
			if (where == 1) x = xByte * 4 + 1;
			if (where == 2) x = xByte * 4 + 3;
		}
		if (depth == 4) { // 2 pixels per byte
			if (where == 0) x = xByte * 2;
			if (where == 1) x = xByte * 2;
			if (where == 2) x = xByte * 2 + 1;
		}
		if (depth == 8) { // 1 byte per pixel
			x = xByte;
		}
		if (depth == 16) { // 2 bytes per pixel
			x = xByte / 2;
		}
		if (depth == 24) { // 3 bytes per pixel
			x = xByte / 3;
		}
		if (depth == 32) { // 4 bytes per pixel
			x = xByte / 4;
		}
		if (x != -1) {
			showColorForPixel(x, y);
		} else {
			statusLabel.setText("");
		}
	}
	
	/*
	 * Set the status label to show color information
	 * for the specified pixel in the image.
	 */
	void showColorForPixel(int x, int y) {
		if (x >= 0 && x < imageData.width && y >= 0 && y < imageData.height) {
			int pixel = imageData.getPixel(x, y);
			RGB rgb = imageData.palette.getRGB(pixel);


			Object[] args = {new Integer(x),
					     new Integer(y),
					     new Integer(pixel),
					     Integer.toHexString(pixel),
					     rgb};
			if (pixel == imageData.transparentPixel) {
				statusLabel.setText(createMsg(bundle.getString("Color_at_trans"), args));
			} else {
				statusLabel.setText(createMsg(bundle.getString("Color_at"), args));
			}
		} else {
			statusLabel.setText("");
		}
	}
	
	/*
	 * Called when the Animate button is pressed.
	 */
	void animate() {
		animate = !animate;
		if (animate && image != null && imageDataArray.length > 1) {
			animateThread = new Thread(bundle.getString("Animation")) {
				public void run() {
					// Pre-animation widget setup.
					preAnimation();
					
					// Animate.
					try {
						animateLoop();
					} catch (final SWTException e) {
						display.syncExec(new Runnable() {
							public void run() {
								showErrorDialog(createMsg(bundle.getString("Creating_image"), 
										    new Integer(imageDataIndex+1)),
										    currentName, e);
							}
						});
					}
					
					// Post animation widget reset.
					postAnimation();
				}
			};
			animateThread.setDaemon(true);
			animateThread.start();
		}
	}
	
	/*
	 * Loop through all of the images in a multi-image file
	 * and display them one after another.
	 */
	void animateLoop() {
		// Create an off-screen image to draw on, and a GC to draw with.
		// Both are disposed after the animation.
		Image offScreenImage = new Image(display, loader.logicalScreenWidth, loader.logicalScreenHeight);
		GC offScreenImageGC = new GC(offScreenImage);
		
		try {
			// Use syncExec to get the background color of the imageCanvas.
			display.syncExec(new Runnable() {
				public void run() {
					canvasBackground = imageCanvas.getBackground();
				}
			});

			// Fill the off-screen image with the background color of the canvas.
			offScreenImageGC.setBackground(canvasBackground);
			offScreenImageGC.fillRectangle(
				0,
				0,
				loader.logicalScreenWidth,
				loader.logicalScreenHeight);
					
			// Draw the current image onto the off-screen image.
			offScreenImageGC.drawImage(
				image,
				0,
				0,
				imageData.width,
				imageData.height,
				imageData.x,
				imageData.y,
				imageData.width,
				imageData.height);

			int repeatCount = loader.repeatCount;
			while (animate && (loader.repeatCount == 0 || repeatCount > 0)) {
				if (imageData.disposalMethod == SWT.DM_FILL_BACKGROUND) {
					// Fill with the background color before drawing.
					Color bgColor = null;
					int backgroundPixel = loader.backgroundPixel;
					if (showBackground && backgroundPixel != -1) {
						// Fill with the background color.
						RGB backgroundRGB = imageData.palette.getRGB(backgroundPixel);
						bgColor = new Color(null, backgroundRGB);
					}
					try {
						offScreenImageGC.setBackground(bgColor != null ? bgColor : canvasBackground);
						offScreenImageGC.fillRectangle(
							imageData.x,
							imageData.y,
							imageData.width,
							imageData.height);
					} finally {
						if (bgColor != null) bgColor.dispose();
					}
				} else if (imageData.disposalMethod == SWT.DM_FILL_PREVIOUS) {
					// Restore the previous image before drawing.
					offScreenImageGC.drawImage(
						image,
						0,
						0,
						imageData.width,
						imageData.height,
						imageData.x,
						imageData.y,
						imageData.width,
						imageData.height);
				}
									
				// Get the next image data.
				imageDataIndex = (imageDataIndex + 1) % imageDataArray.length;
				imageData = imageDataArray[imageDataIndex];
				image.dispose();
				image = new Image(display, imageData);
				
				// Draw the new image data.
				offScreenImageGC.drawImage(
					image,
					0,
					0,
					imageData.width,
					imageData.height,
					imageData.x,
					imageData.y,
					imageData.width,
					imageData.height);
				
				// Draw the off-screen image to the screen.
				imageCanvasGC.drawImage(offScreenImage, 0, 0);
				
				// Sleep for the specified delay time before drawing again.
				try {
					Thread.sleep(visibleDelay(imageData.delayTime * 10));
				} catch (InterruptedException e) {
				}
				
				// If we have just drawn the last image in the set,
				// then decrement the repeat count.
				if (imageDataIndex == imageDataArray.length - 1) repeatCount--;
			}
		} finally {
			offScreenImage.dispose();
			offScreenImageGC.dispose();
		}
	}

	/*
	 * Pre animation setup.
	 */
	void preAnimation() {
		display.syncExec(new Runnable() {
			public void run() {
				// Change the label of the Animate button to 'Stop'.
				animateButton.setText(bundle.getString("Stop"));
				
				// Disable anything we don't want the user
				// to select during the animation.
				previousButton.setEnabled(false);
				nextButton.setEnabled(false);
				backgroundCombo.setEnabled(false);
				scaleXCombo.setEnabled(false);
				scaleYCombo.setEnabled(false);
				alphaCombo.setEnabled(false);
				incrementalCheck.setEnabled(false);
				transparentCheck.setEnabled(false);
				maskCheck.setEnabled(false);
				// leave backgroundCheck enabled
			
				// Reset the scale combos and scrollbars.
				resetScaleCombos();
				resetScrollBars();
			}
		});
	}

	/*
	 * Post animation reset.
	 */
	void postAnimation() {
		display.syncExec(new Runnable() {
			public void run() {
				// Enable anything we disabled before the animation.
				previousButton.setEnabled(true);
				nextButton.setEnabled(true);
				backgroundCombo.setEnabled(true);
				scaleXCombo.setEnabled(true);
				scaleYCombo.setEnabled(true);
				alphaCombo.setEnabled(true);
				incrementalCheck.setEnabled(true);
				transparentCheck.setEnabled(true);
				maskCheck.setEnabled(true);
			
				// Reset the label of the Animate button.
				animateButton.setText(bundle.getString("Animate"));
			
				if (animate) {
					// If animate is still true, we finished the
					// full number of repeats. Leave the image as-is.
					animate = false;
				} else {
					// Redisplay the current image and its palette.
					displayImage(imageDataArray[imageDataIndex]);
				}
			}
		});
	}

	/*
	 * Called when the Previous button is pressed.
	 * Display the previous image in a multi-image file.
	 */
	void previous() {
		if (image != null && imageDataArray.length > 1) {
			if (imageDataIndex == 0) {
				imageDataIndex = imageDataArray.length;
			}
			imageDataIndex = imageDataIndex - 1;
			displayImage(imageDataArray[imageDataIndex]);
		}	
	}

	/*
	 * Called when the Next button is pressed.
	 * Display the next image in a multi-image file.
	 */
	void next() {
		if (image != null && imageDataArray.length > 1) {
			imageDataIndex = (imageDataIndex + 1) % imageDataArray.length;
			displayImage(imageDataArray[imageDataIndex]);
		}	
	}

	void displayImage(ImageData newImageData) {
		if (incremental && incrementalThread != null) {
			// Tell the incremental thread to stop drawing.
			synchronized (this) {
				incrementalEvents = null;
			}
			
			// Wait until the incremental thread is done.
			while (incrementalThread.isAlive()) {
				if (!display.readAndDispatch()) display.sleep();
			}
		}
					
		// Dispose of the old image, if there was one.
		if (image != null) image.dispose();

		try {
			// Cache the new image and imageData.
			image = new Image(display, newImageData);
			imageData = newImageData;

		} catch (SWTException e) {
			showErrorDialog(bundle.getString("Creating_from") + " ", currentName, e);
			image = null;
			return;
		}

		// Update the widgets with the new image info.
		String string = createMsg(bundle.getString("Analyzer_on"), currentName);
		shell.setText(string);

		if (imageDataArray.length > 1) {
			string = createMsg(bundle.getString("Type_index"), 
			                   new Object[] {fileTypeString(imageData.type),
			                                 new Integer(imageDataIndex + 1),
			                                 new Integer(imageDataArray.length)});
		} else {
			string = createMsg(bundle.getString("Type_string"), fileTypeString(imageData.type));
		}
		typeLabel.setText(string);