Example usage for org.eclipse.swt.widgets Canvas Canvas

Introduction

In this page you can find the example usage for org.eclipse.swt.widgets Canvas Canvas.

Prototype

public Canvas(Composite parent, int style) 

Source Link

Document

Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

Usage

From source file:TransformReflectionXYAxis.java

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);//w  ww.j a v  a 2 s.c  o  m
    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);

            // 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);

            transform.dispose();
        }
    });

    shell.setSize(350, 550);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

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From source file:CursorHideControl.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setBounds(10, 10, 200, 200);/*w  w  w.  j a v a 2s .  c o  m*/
    Canvas canvas = new Canvas(shell, SWT.BORDER);
    canvas.setBounds(10, 50, 150, 100);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawString("hide Cursor here", 10, 10);
        }
    });

    // create a cursor with a transparent image
    Color white = display.getSystemColor(SWT.COLOR_WHITE);
    Color black = display.getSystemColor(SWT.COLOR_BLACK);
    PaletteData palette = new PaletteData(new RGB[] { white.getRGB(), black.getRGB() });
    ImageData sourceData = new ImageData(16, 16, 1, palette);
    sourceData.transparentPixel = 0;
    Cursor cursor = new Cursor(display, sourceData, 0, 0);

    shell.open();
    canvas.setCursor(cursor);
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    cursor.dispose();
    display.dispose();
}

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From source file:AnimationDoubleBuffering.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Animator");

    shell.setLayout(new FillLayout());
    canvas = new Canvas(shell, SWT.NO_BACKGROUND);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent event) {
            // Create the image to fill the canvas
            Image image = new Image(shell.getDisplay(), canvas.getBounds());
            // Set up the offscreen gc
            GC gcImage = new GC(image);

            gcImage.setBackground(event.gc.getBackground());
            gcImage.fillRectangle(image.getBounds());
            gcImage.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_RED));
            gcImage.fillOval(x, y, IMAGE_WIDTH, IMAGE_WIDTH);

            // Draw the offscreen buffer to the screen
            event.gc.drawImage(image, 0, 0);

            image.dispose();//from   w  ww  .  j  ava  2  s  .c om
            gcImage.dispose();
        }
    });

    shell.open();
    Runnable runnable = new Runnable() {
        public void run() {
            animate();
            display.timerExec(TIMER_INTERVAL, this);
        }
    };
    display.timerExec(TIMER_INTERVAL, runnable);

    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    // Kill the timer
    display.timerExec(-1, runnable);
    display.dispose();

}

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From source file:org.eclipse.swt.snippets.Snippet275.java

public static void main(String[] args) {
    final int INTERVAL = 888;
    final Display display = new Display();
    final Image image = new Image(display, 750, 750);
    GC gc = new GC(image);
    gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
    gc.fillRectangle(image.getBounds());
    gc.dispose();//from w ww.j  a  v a2s . com

    Shell shell = new Shell(display);
    shell.setText("Snippet 275");
    shell.setBounds(10, 10, 790, 790);
    final Canvas canvas = new Canvas(shell, SWT.NONE);
    canvas.setBounds(10, 10, 750, 750);
    canvas.addListener(SWT.Paint, event -> {
        value = String.valueOf(System.currentTimeMillis());
        event.gc.drawImage(image, 0, 0);
        event.gc.drawString(value, 10, 10, true);
    });
    display.timerExec(INTERVAL, new Runnable() {
        @Override
        public void run() {
            if (canvas.isDisposed())
                return;
            // canvas.redraw (); // <-- bad, damages more than is needed
            GC gc = new GC(canvas);
            Point extent = gc.stringExtent(value + '0');
            gc.dispose();
            canvas.redraw(10, 10, extent.x, extent.y, false);
            display.timerExec(INTERVAL, this);
        }
    });
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

---

From source file:org.eclipse.swt.snippets.Snippet21.java

public static void main(String[] args) {
    Display display = new Display();
    final Color red = display.getSystemColor(SWT.COLOR_RED);
    final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    Shell shell = new Shell(display);
    shell.setText("Snippet 21");
    Button b = new Button(shell, SWT.PUSH);
    Rectangle clientArea = shell.getClientArea();
    b.setBounds(clientArea.x + 10, clientArea.y + 10, 100, 32);
    b.setText("Button");
    shell.setDefaultButton(b);//w  ww .j av  a2  s .co  m
    final Canvas c = new Canvas(shell, SWT.BORDER);
    c.setBounds(10, 50, 100, 32);
    c.addListener(SWT.Traverse, e -> {
        switch (e.detail) {
        /* Do tab group traversal */
        case SWT.TRAVERSE_ESCAPE:
        case SWT.TRAVERSE_RETURN:
        case SWT.TRAVERSE_TAB_NEXT:
        case SWT.TRAVERSE_TAB_PREVIOUS:
        case SWT.TRAVERSE_PAGE_NEXT:
        case SWT.TRAVERSE_PAGE_PREVIOUS:
            e.doit = true;
            break;
        }
    });
    c.addListener(SWT.FocusIn, e -> c.setBackground(red));
    c.addListener(SWT.FocusOut, e -> c.setBackground(blue));
    c.addListener(SWT.KeyDown, e -> System.out.println("KEY"));
    Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
    t.setBounds(10, 85, 100, 32);

    Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
    r.setBounds(10, 120, 100, 32);

    c.setFocus();
    shell.setSize(200, 200);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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From source file:org.eclipse.swt.snippets.Snippet112.java

public static void main(String[] args) {
    Display display = new Display();
    final Image image = new Image(display, 20, 20);
    Color color = display.getSystemColor(SWT.COLOR_RED);
    GC gc = new GC(image);
    gc.setBackground(color);/*from   w  ww . j a  v  a  2  s  .c  om*/
    gc.fillRectangle(image.getBounds());
    gc.dispose();

    Shell shell = new Shell(display);
    shell.setText("Snippet 112");
    shell.setLayout(new FillLayout());
    Group group = new Group(shell, SWT.NONE);
    group.setLayout(new FillLayout());
    group.setText("a square");
    Canvas canvas = new Canvas(group, SWT.NONE);
    canvas.addPaintListener(e -> e.gc.drawImage(image, 0, 0));

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

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From source file:org.eclipse.swt.snippets.Snippet174.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("OpenGL in SWT");
    shell.setLayout(new FillLayout());
    final Canvas canvas = new Canvas(shell, SWT.NO_BACKGROUND);
    canvas.addControlListener(new ControlAdapter() {
        public void controlResized(ControlEvent e) {
            resize(canvas);//  w w w.  java 2  s  .  c o m
        }
    });
    final GLContext context = init(canvas);
    shell.addDisposeListener(new DisposeListener() {
        public void widgetDisposed(DisposeEvent e) {
            context.dispose();
        }
    });
    new Runnable() {
        public void run() {
            if (canvas.isDisposed())
                return;
            render();
            context.swapBuffers();
            canvas.getDisplay().timerExec(50, this);
        }
    }.run();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:ColorTransparentCreate.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setBounds(10, 10, 200, 200);/*from w w  w  .  ja  va2s  . co  m*/

    // create a cursor with a transparent image
    Color white = display.getSystemColor(SWT.COLOR_WHITE);
    Color black = display.getSystemColor(SWT.COLOR_BLACK);
    PaletteData palette = new PaletteData(new RGB[] { white.getRGB(), black.getRGB() });
    final ImageData sourceData = new ImageData(30, 30, 1, palette);
    sourceData.transparentPixel = 0;

    Canvas canvas = new Canvas(shell, SWT.BORDER);
    canvas.setBounds(10, 50, 150, 100);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawString("hide Cursor here", 10, 10);
            e.gc.drawImage(new Image(display, sourceData), 0, 0);
        }
    });

    shell.open();

    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }

    display.dispose();
}

---

From source file:org.eclipse.swt.snippets.Snippet207.java

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);// www . j  ava  2s.c  o  m
    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(e -> {
        GC gc1 = e.gc;
        gc1.setAdvanced(true);
        if (!gc1.getAdvanced()) {
            gc1.drawText("Advanced graphics not supported", 30, 30, true);
            return;
        }

        // Original image
        int x = 30, y = 30;
        gc1.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);
        gc1.setTransform(transform);
        gc1.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);
        gc1.setTransform(transform);
        gc1.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);
        gc1.setTransform(transform);
        gc1.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);
        gc1.setTransform(transform);
        gc1.drawImage(image, 300, y);

        // Shear in y-direction
        transform.setElements(1, -1, 0, 1, 0, 0);
        gc1.setTransform(transform);
        gc1.drawImage(image, 150, 475);

        // Rotate by 45 degrees
        float cos45 = (float) Math.cos(Math.PI / 4);
        float sin45 = (float) Math.sin(Math.PI / 4);
        transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
        gc1.setTransform(transform);
        gc1.drawImage(image, 400, 60);

        transform.dispose();
    });

    shell.setSize(350, 550);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

---

From source file:org.eclipse.swt.snippets.Snippet215.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Snippet 215");
    shell.setLayout(new FillLayout());
    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.addListener(SWT.Selection, event -> {

        /* Take the screen shot */
        GC gc = new GC(display);
        final Image image = new Image(display, display.getBounds());
        gc.copyArea(image, 0, 0);/*  ww  w  .j av a 2s .  com*/
        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, 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(e -> e.gc.drawImage(image, 0, 0));
        popup.open();
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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