imageanalyzer.java

SUN公司eclipse3.2.2经典例子

	}

	void menuPrint() {
		if (image == null) return;

		try {
			// Ask the user to specify the printer.
			PrintDialog dialog = new PrintDialog(shell, SWT.NONE);
			PrinterData printerData = dialog.open();
			if (printerData == null) return;
			
			Printer printer = new Printer(printerData);
			Point screenDPI = display.getDPI();
			Point printerDPI = printer.getDPI();
			int scaleFactor = printerDPI.x / screenDPI.x;
			Rectangle trim = printer.computeTrim(0, 0, 0, 0);
			if (printer.startJob(currentName)) {
				if (printer.startPage()) {
					GC gc = new GC(printer);
					int transparentPixel = imageData.transparentPixel;
					if (transparentPixel != -1 && !transparent) {
						imageData.transparentPixel = -1;
					}
					Image printerImage = new Image(printer, imageData);
					gc.drawImage(
						printerImage,
						0,
						0,
						imageData.width,
						imageData.height,
						-trim.x,
						-trim.y,
						scaleFactor * imageData.width,
						scaleFactor * imageData.height);
					if (transparentPixel != -1 && !transparent) {
						imageData.transparentPixel = transparentPixel;
					}
					printerImage.dispose();
					gc.dispose();
					printer.endPage();
				}
				printer.endJob();
			}
			printer.dispose();
		} catch (SWTError e) {
			MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
			box.setMessage(bundle.getString("Printing_error") + e.getMessage());
			box.open();
		}
	}

	void menuReopen() {
		if (currentName == null) return;
		animate = false; // stop any animation in progress
		Cursor waitCursor = new Cursor(display, SWT.CURSOR_WAIT);
		shell.setCursor(waitCursor);
		imageCanvas.setCursor(waitCursor);
		try {
			loader = new ImageLoader();
			ImageData[] newImageData;
			if (fileName == null) {
				URL url = new URL(currentName);
				InputStream stream = url.openStream();
				long startTime = System.currentTimeMillis();
				newImageData = loader.load(stream);
				loadTime = System.currentTimeMillis() - startTime;
				stream.close();
			} else {
				long startTime = System.currentTimeMillis();
				newImageData = loader.load(fileName);
				loadTime = System.currentTimeMillis() - startTime;
			}
			imageDataIndex = 0;
			displayImage(newImageData[imageDataIndex]);

		} catch (Exception e) {
			showErrorDialog(bundle.getString("Reloading_lc"), currentName, e);
		} catch (OutOfMemoryError e) {
			showErrorDialog(bundle.getString("Reloading_lc"), currentName, e);
		} finally {	
			shell.setCursor(null);
			imageCanvas.setCursor(crossCursor);
			waitCursor.dispose();
		}
	}
	
	void changeBackground() {
		String background = backgroundCombo.getText();
		if (background.equals(bundle.getString("White"))) {
			imageCanvas.setBackground(whiteColor);
		} else if (background.equals(bundle.getString("Black"))) {
			imageCanvas.setBackground(blackColor);
		} else if (background.equals(bundle.getString("Red"))) {
			imageCanvas.setBackground(redColor);
		} else if (background.equals(bundle.getString("Green"))) {
			imageCanvas.setBackground(greenColor);
		} else if (background.equals(bundle.getString("Blue"))) {
			imageCanvas.setBackground(blueColor);
		} else {
			imageCanvas.setBackground(null);
		}
	}
	
	/*
	 * Called when the ScaleX combo selection changes.
	 */
	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);
			boolean hasAlpha = false;
			int alphaValue = 0;
			if (imageData.alphaData != null && imageData.alphaData.length > 0) {
				hasAlpha = true;
				alphaValue = imageData.getAlpha(x, y);
			}
			String rgbMessageFormat = bundle.getString(hasAlpha ? "RGBA" : "RGB");
			Object[] rgbArgs = {
					Integer.toString(rgb.red),
					Integer.toString(rgb.green),
					Integer.toString(rgb.blue),
					Integer.toString(alphaValue)
			};
			Object[] rgbHexArgs = {
					Integer.toHexString(rgb.red),
					Integer.toHexString(rgb.green),
					Integer.toHexString(rgb.blue),
					Integer.toHexString(alphaValue)
			};
			Object[] args = {
					new Integer(x),
					new Integer(y),
					new Integer(pixel),
					Integer.toHexString(pixel),
					createMsg(rgbMessageFormat, rgbArgs),
					createMsg(rgbMessageFormat, rgbHexArgs),
					(pixel == imageData.transparentPixel) ? bundle.getString("Color_at_transparent") : ""};
			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() {