1、點擊鼠標左鍵在shell里畫線。
?public static void main(String[] args)
?{
??Display display = new Display();
??final Shell shell = new Shell(display);
??Listener listener = new Listener() {
???int?lastX?= 0, lastY = 0;
???public void handleEvent(Event event)
???{
????switch (event.type)
????{
?????case SWT.MouseMove :
??????if ((event.stateMask & SWT.BUTTON1) == 0)
???????break; // 判斷是否為鼠標左鍵，如果不是跳出
??????GC gc = new GC(shell);
??????gc.drawLine(lastX, lastY, event.x, event.y);
??????gc.dispose();
?????// FALL THROUGH
?????case SWT.MouseDown :
??????lastX = event.x;
??????lastY = event.y;
??????break;
????}
???}
??};
??shell.addListener(SWT.MouseDown, listener);
??shell.addListener(SWT.MouseMove, listener);
??shell.open();
??while (!shell.isDisposed())
??{
???if (!display.readAndDispatch())
????display.sleep();
??}
??display.dispose();
?}
2、在彈出窗口中顯示表的當時圖像狀態。
?public static void main(String[] args) {
??final Display display = new Display();
??final Shell shell = new Shell(display);
??shell.setText("Widget");
??
??//建立一個簡單的表
??final Table table = new Table(shell, SWT.MULTI);
??table.setLinesVisible(true);
??table.setBounds(10, 10, 100, 100);
??for (int i = 0; i < 9; i++) {
???new TableItem(table, SWT.NONE).setText("item" + i);
??}
??
??//建立捕捉圖像的按鈕
??Button button = new Button(shell, SWT.PUSH);
??button.setText("Capture");
??button.pack();
??button.setLocation(10, 140);
??
??
??button.addListener(SWT.Selection, new Listener() {
???public void handleEvent(Event event) {
????Point tableSize = table.getSize();?//獲取表的大小
????GC gc = new GC(table);?//建立表的GC對象
????final Image image =
?????new Image(display, tableSize.x, tableSize.y);?//建立表大小的圖像image
????gc.copyArea(image, 0, 0);?//利用表的GC對象把表的圖像復制到image中
????gc.dispose();
????
????//建立一個彈出面板Shell對象popup
????Shell popup = new Shell(shell);
????popup.setText("Image");
????popup.addListener(SWT.Close, new Listener() {
?????public void handleEvent(Event e) {
??????image.dispose();
?????}
????});
????//在popup上建立畫布對象canvas
????Canvas canvas = new Canvas(popup, SWT.NONE);
????canvas.setBounds(10, 10, tableSize.x+10, tableSize.y+10);
????canvas.addPaintListener(new PaintListener() {
?????public void paintControl(PaintEvent e) {
??????e.gc.drawImage(image, 0, 0);?//在畫布上繪出表的圖像image
?????}
????});
????popup.pack();
????popup.open();
???}
??});
??shell.pack();
??shell.open();
??while (!shell.isDisposed()) {
???if (!display.readAndDispatch()) display.sleep();
??}
??display.dispose();
?}
3、獲取整個窗口的圖像并顯示。
?public static void main(String[] args) {
??final Display display = new Display();
??final Shell shell = new Shell(display);
??shell.setLayout(new FillLayout());
??Button button = new Button(shell, SWT.PUSH);
??button.setText("Capture");
??button.addListener(SWT.Selection, new Listener() {
???public void handleEvent(Event event) {
????
????/* Take the screen shot */
????GC gc = new GC(display);
????final Image image = new Image(display, display.getBounds());
????gc.copyArea(image, 0, 0);
????gc.dispose();
????
????Shell popup = new Shell(shell, SWT.SHELL_TRIM);
????popup.setLayout(new FillLayout());
????popup.setText("Image");
????popup.setBounds(50, 50, 200, 200);
????popup.addListener(SWT.Close, new Listener() {
?????public void handleEvent(Event e) {
??????image.dispose();
?????}
????});
????
????ScrolledComposite sc = new ScrolledComposite (popup, SWT.V_SCROLL | SWT.H_SCROLL);
????Canvas canvas = new Canvas(sc, SWT.NONE);
????sc.setContent(canvas);
????canvas.setBounds(display.getBounds ());
????canvas.addPaintListener(new PaintListener() {
?????public void paintControl(PaintEvent e) {
??????e.gc.drawImage(image, 0, 0);
?????}
????});
????popup.open();
???}
??});
??shell.pack();
??shell.open();
??while (!shell.isDisposed()) {
???if (!display.readAndDispatch()) display.sleep();
??}
??display.dispose();
?}
4、使用transform、alpha和paths混合技術繪圖。注意：必須在項目中import“swt-gdip-win32-3139.dll”。
?public static void main(String[] args) {
??final Display display = new Display();
??final Shell shell = new Shell(display);
??shell.setText("Advanced Graphics");
??FontData fd = shell.getFont().getFontData()[0];
??final Font font = new Font(display, fd.getName(), 60, SWT.BOLD | SWT.ITALIC);
??final Image image = new Image(display, 640, 480);
??final Rectangle rect = image.getBounds();
??GC gc = new GC(image);
??gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
??gc.fillOval(rect.x, rect.y, rect.width, rect.height);
??gc.dispose();
??shell.addListener(SWT.Paint, new Listener() {
???public void handleEvent(Event event) {
????GC gc = event.gc;????
????Transform tr = new Transform(display);
????tr.translate(50, 120);
????tr.rotate(-30);
????gc.drawImage(image, 0, 0, rect.width, rect.height, 0, 0, rect.width / 2, rect.height / 2);
????gc.setAlpha(100);
????gc.setTransform(tr);
????Path path = new Path(display);
????path.addString("SWT", 0, 0, font);
????gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
????gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
????gc.fillPath(path);
????gc.drawPath(path);
????tr.dispose();
????path.dispose();
???}???
??});
??shell.setSize(shell.computeSize(rect.width / 2, rect.height / 2));
??shell.open();
??while (!shell.isDisposed()) {
???if (!display.readAndDispatch())
????display.sleep();
??}
??image.dispose();
??font.dispose();
??display.dispose();
?}
5、對圖像進行旋轉。
?public static void main(String[] args) {
??final Display display = new Display();
??
??final Image image = new Image(display, 110, 60);
??GC gc = new GC(image);
??Font font = new Font(display, "Times", 30, SWT.BOLD);
??gc.setFont(font);
??gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
??gc.fillRectangle(0, 0, 110, 60);
??gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
??gc.drawText("SWT", 10, 10, true);
??font.dispose();
??gc.dispose();
??
??final Rectangle rect = image.getBounds();
??Shell shell = new Shell(display);
??shell.setText("Matrix Tranformations");
??shell.setLayout(new FillLayout());
??final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
??canvas.addPaintListener(new PaintListener () {
???public void paintControl(PaintEvent e) {?
????GC gc = e.gc;
????gc.setAdvanced(true);
????if (!gc.getAdvanced()){
?????gc.drawText("Advanced graphics not supported", 30, 30, true);
?????return;
????}
????
????// Original image
????int x = 30, y = 30;
????gc.drawImage(image, x, y);
????x += rect.width + 30;
????
????Transform transform = new Transform(display);
????
????// Note that the tranform is applied to the whole GC therefore
????// the coordinates need to be adjusted too.
????
????// Reflect around the y axis.
????transform.setElements(-1, 0, 0, 1, 0 ,0);
????gc.setTransform(transform);
????gc.drawImage(image, -1*x-rect.width, y);
????
????x = 30; y += rect.height + 30;
????
????// Reflect around the x axis.
????transform.setElements(1, 0, 0, -1, 0, 0);
????gc.setTransform(transform);
????gc.drawImage(image, x, -1*y-rect.height);
????
????x += rect.width + 30;
????
????// Reflect around the x and y axes?
????transform.setElements(-1, 0, 0, -1, 0, 0);
????gc.setTransform(transform);
????gc.drawImage(image, -1*x-rect.width, -1*y-rect.height);
????
????x = 30; y += rect.height + 30;
????
????// Shear in the x-direction
????transform.setElements(1, 0, -1, 1, 0, 0);
????gc.setTransform(transform);
????gc.drawImage(image, 300, y);
????
????// Shear in y-direction
????transform.setElements(1, -1, 0, 1, 0, 0);
????gc.setTransform(transform);
????gc.drawImage(image, 150, 475);
????
????// Rotate by 45 degrees?
????float cos45 = (float)Math.cos(45);
????float sin45 = (float)Math.sin(45);
????transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
????gc.setTransform(transform);
????gc.drawImage(image, 350, 100);
????
????transform.dispose();
???}
??});
??
??shell.setSize(350, 550);
??shell.open();
??while (!shell.isDisposed()) {
???if (!display.readAndDispatch())
????display.sleep();
??}
??image.dispose();
??display.dispose();
?}