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

Introduction

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

Prototype

public Point getSize() 

Source Link

Document

Returns a point describing the receiver's size.

Usage

From source file:DrawPointLineWidth.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Canvas Example");
    shell.setLayout(new FillLayout());

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            Canvas canvas = (Canvas) e.widget;
            int maxX = canvas.getSize().x;
            int maxY = canvas.getSize().y;

            int halfX = (int) maxX / 2;
            int halfY = (int) maxY / 2;

            e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLUE));
            e.gc.setLineWidth(10);/*from   ww  w  . j  av  a 2s  . c  o  m*/
            e.gc.drawLine(halfX, 0, halfX, maxY);
            e.gc.drawLine(0, halfY, maxX, halfY);
        }
    });

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

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From source file:SineFunctionPlotting.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Canvas Example");
    shell.setLayout(new FillLayout());

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            Canvas canvas = (Canvas) e.widget;
            int maxX = canvas.getSize().x;
            int maxY = canvas.getSize().y;

            // Calculate the middle
            int halfX = (int) maxX / 2;
            int halfY = (int) maxY / 2;

            // Set the line color and draw a horizontal axis
            e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLACK));
            e.gc.drawLine(0, halfY, maxX, halfY);

            // Draw the sine wave
            for (int i = 0; i < maxX; i++) {
                e.gc.drawPoint(i, getNormalizedSine(i, halfY, maxX));
            }/*from  www  .j  a  va  2 s .c o m*/
        }
    });

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

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From source file:org.eclipse.swt.snippets.Snippet367.java

public static void main(String[] args) {
    final ImageFileNameProvider filenameProvider = zoom -> {
        switch (zoom) {
        case 100:
            return IMAGE_PATH_100;
        case 150:
            return IMAGE_PATH_150;
        case 200:
            return IMAGE_PATH_200;
        default:/*from  ww w  .j a va 2s  .  c o  m*/
            return null;
        }
    };
    final ImageDataProvider imageDataProvider = zoom -> {
        switch (zoom) {
        case 100:
            return new ImageData(IMAGE_PATH_100);
        case 150:
            return new ImageData(IMAGE_PATH_150);
        case 200:
            return new ImageData(IMAGE_PATH_200);
        default:
            return null;
        }
    };

    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Snippet367");
    shell.setLayout(new GridLayout(3, false));

    Menu menuBar = new Menu(shell, SWT.BAR);
    shell.setMenuBar(menuBar);
    MenuItem fileItem = new MenuItem(menuBar, SWT.CASCADE);
    fileItem.setText("&File");
    Menu fileMenu = new Menu(menuBar);
    fileItem.setMenu(fileMenu);
    MenuItem exitItem = new MenuItem(fileMenu, SWT.PUSH);
    exitItem.setText("&Exit");
    exitItem.addListener(SWT.Selection, e -> shell.close());

    new Label(shell, SWT.NONE).setText(IMAGE_200 + ":");
    new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_200));
    new Button(shell, SWT.PUSH).setImage(new Image(display, IMAGE_PATH_200));

    new Label(shell, SWT.NONE).setText(IMAGE_150 + ":");
    new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_150));
    new Button(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_150));

    new Label(shell, SWT.NONE).setText(IMAGE_100 + ":");
    new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_100));
    new Button(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_100));

    createSeparator(shell);

    new Label(shell, SWT.NONE).setText("ImageFileNameProvider:");
    new Label(shell, SWT.NONE).setImage(new Image(display, filenameProvider));
    new Button(shell, SWT.NONE).setImage(new Image(display, filenameProvider));

    new Label(shell, SWT.NONE).setText("ImageDataProvider:");
    new Label(shell, SWT.NONE).setImage(new Image(display, imageDataProvider));
    new Button(shell, SWT.NONE).setImage(new Image(display, imageDataProvider));

    createSeparator(shell);

    new Label(shell, SWT.NONE).setText("1. Canvas\n(PaintListener)");
    final Point size = new Point(550, 40);
    final Canvas canvas = new Canvas(shell, SWT.NONE);
    canvas.addPaintListener(e -> {
        Point size1 = canvas.getSize();
        paintImage(e.gc, size1);
    });
    GridData gridData = new GridData(size.x, size.y);
    gridData.horizontalSpan = 2;
    canvas.setLayoutData(gridData);

    createSeparator(shell);

    new Label(shell, SWT.NONE).setText("2. Painted image\n (default resolution)");
    Image image = new Image(display, size.x, size.y);
    GC gc = new GC(image);
    try {
        paintImage(gc, size);
    } finally {
        gc.dispose();
    }
    Label imageLabel = new Label(shell, SWT.NONE);
    imageLabel.setImage(image);
    imageLabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false, 2, 1));

    createSeparator(shell);

    new Label(shell, SWT.NONE).setText("3. Painted image\n(multi-res, unzoomed paint)");
    imageLabel = new Label(shell, SWT.NONE);
    imageLabel.setImage(new Image(display, (ImageDataProvider) zoom -> {
        Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
        GC gc1 = new GC(temp);
        try {
            paintImage(gc1, size);
            return temp.getImageData();
        } finally {
            gc1.dispose();
            temp.dispose();
        }
    }));
    imageLabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false, 2, 1));

    createSeparator(shell);

    new Label(shell, SWT.NONE).setText("4. Painted image\n(multi-res, zoomed paint)");
    imageLabel = new Label(shell, SWT.NONE);
    imageLabel.setImage(new Image(display, (ImageDataProvider) zoom -> {
        Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
        GC gc1 = new GC(temp);
        try {
            paintImage2(gc1, new Point(size.x * zoom / 100, size.y * zoom / 100), zoom / 100);
            return temp.getImageData();
        } finally {
            gc1.dispose();
            temp.dispose();
        }
    }));
    imageLabel.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false, 2, 1));

    createSeparator(shell);

    new Label(shell, SWT.NONE).setText("5. 50x50 box\n(Display#getDPI(): " + display.getDPI().x + ")");
    Label box = new Label(shell, SWT.NONE);
    box.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW));
    box.setLayoutData(new GridData(50, 50));

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

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From source file:LineExample.java

/**
 * Creates the main window's contents/*w w  w  .  j  ava  2s. c o  m*/
 * 
 * @param shell the main window
 */
private void createContents(Shell shell) {
    shell.setLayout(new FillLayout());

    // Create a canvas to draw on
    Canvas canvas = new Canvas(shell, SWT.NONE);

    // Add a handler to do the drawing
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            // Get the canvas and its size
            Canvas canvas = (Canvas) e.widget;
            int maxX = canvas.getSize().x;
            int maxY = canvas.getSize().y;

            // Calculate the middle
            int halfX = (int) maxX / 2;
            int halfY = (int) maxY / 2;

            // Set the drawing color to blue
            e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLUE));

            // Set the width of the lines to draw
            e.gc.setLineWidth(10);

            // Draw a vertical line halfway across the canvas
            e.gc.drawLine(halfX, 0, halfX, maxY);

            // Draw a horizontal line halfway down the canvas
            e.gc.drawLine(0, halfY, maxX, halfY);
        }
    });
}

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From source file:DrawTextDemo.java

public DrawTextDemo() {
    shell.setLayout(new FillLayout());

    final Canvas canvas = new Canvas(shell, SWT.NO_BACKGROUND);

    final Image image = new Image(display, "java2s.gif");
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            Rectangle size = image.getBounds();
            // Draws the background image.
            e.gc.drawImage(image, 0, 0, size.width, size.height, 0, 0, canvas.getSize().x, canvas.getSize().y);

            Font font = new Font(display, "Tahoma", 18, SWT.BOLD);
            e.gc.setFont(font);/* ww w.  j a v  a 2s . com*/
            e.gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
            e.gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));

            String english = "SWT rocks!";
            String chinese = "\u4e2d\u6587\u6c49\u5b57\u6d4b\u8bd5";

            e.gc.drawString(english, 10, 10);
            e.gc.drawString(chinese, 10, 80, true);

            String text = "Text to be drawn in the center";
            Point textSize = e.gc.textExtent(text);
            e.gc.drawText(text, (canvas.getSize().x - textSize.x) / 2, (canvas.getSize().y - textSize.y) / 2);

            font.dispose();
        }
    });

    shell.setSize(300, 150);
    shell.open();
    //textUser.forceFocus();

    // Set up the event loop.
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            // If no more entries in event queue
            display.sleep();
        }
    }

    display.dispose();
}

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From source file:DoubleBuffer.java

public DoubleBuffer() {
    shell.setLayout(new FillLayout());

    final Image imageEclipse = new Image(display, "java2s.gif");

    //      final Canvas canvas = new Canvas(shell, SWT.NULL);
    //      canvas.addPaintListener(new PaintListener() {
    //         public void paintControl(PaintEvent e) {
    //            Point size = canvas.getSize();
    //// www .  ja  va  2  s  .  c  o  m
    //            int x1 = (int) (Math.random() * size.x);
    //            int y1 = (int) (Math.random() * size.y);
    //            int x2 = Math.max(canvas.getBounds().width - x1 - 10, 50);
    //            int y2 = Math.max(canvas.getBounds().height - y1 - 10, 50);
    //
    //            
    //            e.gc.drawRoundRectangle(x1, y1, x2, y2, 5, 5);
    //
    //            display.timerExec(100, new Runnable() {
    //               public void run() {
    //                  canvas.redraw();
    //               }
    //            });
    //            
    //         }
    //      });

    final Canvas doubleBufferedCanvas = new Canvas(shell, SWT.NO_BACKGROUND);

    doubleBufferedCanvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            // Creates new image only absolutely necessary.
            Image image = (Image) doubleBufferedCanvas.getData("double-buffer-image");
            if (image == null || image.getBounds().width != doubleBufferedCanvas.getSize().x
                    || image.getBounds().height != doubleBufferedCanvas.getSize().y) {
                image = new Image(display, doubleBufferedCanvas.getSize().x, doubleBufferedCanvas.getSize().y);
                doubleBufferedCanvas.setData("double-buffer-image", image);
            }

            // Initializes the graphics context of the image. 
            GC imageGC = new GC(image);
            imageGC.setBackground(e.gc.getBackground());
            imageGC.setForeground(e.gc.getForeground());
            imageGC.setFont(e.gc.getFont());

            // Fills background. 
            Rectangle imageSize = image.getBounds();
            imageGC.fillRectangle(0, 0, imageSize.width + 1, imageSize.height + 1);

            // Performs actual drawing here ...
            Point size = doubleBufferedCanvas.getSize();

            int x1 = (int) (Math.random() * size.x);
            int y1 = (int) (Math.random() * size.y);
            int x2 = Math.max(doubleBufferedCanvas.getBounds().width - x1 - 10, 50);
            int y2 = Math.max(doubleBufferedCanvas.getBounds().height - y1 - 10, 50);

            imageGC.drawRoundRectangle(x1, y1, x2, y2, 5, 5);

            // Draws the buffer image onto the canvas. 
            e.gc.drawImage(image, 0, 0);

            imageGC.dispose();

            display.timerExec(100, new Runnable() {
                public void run() {
                    doubleBufferedCanvas.redraw();
                }
            });
        }
    });

    shell.setSize(300, 200);
    shell.open();
    //textUser.forceFocus();

    // Set up the event loop.
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            // If no more entries in event queue
            display.sleep();
        }
    }

    display.dispose();
}

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From source file:BrowserExample.java

/**
 * Creates an instance of a ControlExample embedded inside the supplied
 * parent Composite./*  w ww.  j  a v a  2  s . c  om*/
 * 
 * @param parent
 *            the container of the example
 */
public BrowserExample(Composite parent) {

    final Display display = parent.getDisplay();
    FormLayout layout = new FormLayout();
    parent.setLayout(layout);
    ToolBar toolbar = new ToolBar(parent, SWT.NONE);
    final ToolItem itemBack = new ToolItem(toolbar, SWT.PUSH);
    itemBack.setText(getResourceString("Back"));
    final ToolItem itemForward = new ToolItem(toolbar, SWT.PUSH);
    itemForward.setText(getResourceString("Forward"));
    final ToolItem itemStop = new ToolItem(toolbar, SWT.PUSH);
    itemStop.setText(getResourceString("Stop"));
    final ToolItem itemRefresh = new ToolItem(toolbar, SWT.PUSH);
    itemRefresh.setText(getResourceString("Refresh"));
    final ToolItem itemGo = new ToolItem(toolbar, SWT.PUSH);
    itemGo.setText(getResourceString("Go"));

    location = new Text(parent, SWT.BORDER);

    images = new Image[] { new Image(display, "java2s.gif") };

    final Canvas canvas = new Canvas(parent, SWT.NO_BACKGROUND);
    final Rectangle rect = images[0].getBounds();
    canvas.addListener(SWT.Paint, new Listener() {
        public void handleEvent(Event e) {
            Point pt = canvas.getSize();
            e.gc.drawImage(images[index], 0, 0, rect.width, rect.height, 0, 0, pt.x, pt.y);
        }
    });
    canvas.addListener(SWT.MouseDown, new Listener() {
        public void handleEvent(Event e) {
            browser.setUrl(getResourceString("Startup"));
        }
    });

    display.asyncExec(new Runnable() {
        public void run() {
            if (canvas.isDisposed())
                return;
            if (busy) {
                index++;
                if (index == images.length)
                    index = 0;
                canvas.redraw();
            }
            display.timerExec(150, this);
        }
    });

    final Label status = new Label(parent, SWT.NONE);
    final ProgressBar progressBar = new ProgressBar(parent, SWT.NONE);

    FormData data = new FormData();
    data.top = new FormAttachment(0, 5);
    toolbar.setLayoutData(data);

    data = new FormData();
    data.left = new FormAttachment(0, 0);
    data.right = new FormAttachment(100, 0);
    data.top = new FormAttachment(canvas, 5, SWT.DEFAULT);
    data.bottom = new FormAttachment(status, -5, SWT.DEFAULT);
    try {
        browser = new Browser(parent, SWT.NONE);
        browser.setLayoutData(data);
    } catch (SWTError e) {
        /* Browser widget could not be instantiated */
        Label label = new Label(parent, SWT.CENTER | SWT.WRAP);
        label.setText(getResourceString("BrowserNotCreated"));
        label.setLayoutData(data);
    }

    data = new FormData();
    data.width = 24;
    data.height = 24;
    data.top = new FormAttachment(0, 5);
    data.right = new FormAttachment(100, -5);
    canvas.setLayoutData(data);

    data = new FormData();
    data.top = new FormAttachment(toolbar, 0, SWT.TOP);
    data.left = new FormAttachment(toolbar, 5, SWT.RIGHT);
    data.right = new FormAttachment(canvas, -5, SWT.DEFAULT);
    location.setLayoutData(data);

    data = new FormData();
    data.left = new FormAttachment(0, 5);
    data.right = new FormAttachment(progressBar, 0, SWT.DEFAULT);
    data.bottom = new FormAttachment(100, -5);
    status.setLayoutData(data);

    data = new FormData();
    data.right = new FormAttachment(100, -5);
    data.bottom = new FormAttachment(100, -5);
    progressBar.setLayoutData(data);

    if (browser != null) {
        itemBack.setEnabled(browser.isBackEnabled());
        itemForward.setEnabled(browser.isForwardEnabled());

        Listener listener = new Listener() {
            public void handleEvent(Event event) {
                ToolItem item = (ToolItem) event.widget;
                if (item == itemBack)
                    browser.back();
                else if (item == itemForward)
                    browser.forward();
                else if (item == itemStop)
                    browser.stop();
                else if (item == itemRefresh)
                    browser.refresh();
                else if (item == itemGo)
                    browser.setUrl(location.getText());
            }
        };
        browser.addLocationListener(new LocationListener() {
            public void changed(LocationEvent event) {
                busy = true;
                if (event.top)
                    location.setText(event.location);
            }

            public void changing(LocationEvent event) {
            }
        });
        browser.addProgressListener(new ProgressListener() {
            public void changed(ProgressEvent event) {
                if (event.total == 0)
                    return;
                int ratio = event.current * 100 / event.total;
                progressBar.setSelection(ratio);
                busy = event.current != event.total;
                if (!busy) {
                    index = 0;
                    canvas.redraw();
                }
            }

            public void completed(ProgressEvent event) {
                itemBack.setEnabled(browser.isBackEnabled());
                itemForward.setEnabled(browser.isForwardEnabled());
                progressBar.setSelection(0);
                busy = false;
                index = 0;
                canvas.redraw();
            }
        });
        browser.addStatusTextListener(new StatusTextListener() {
            public void changed(StatusTextEvent event) {
                status.setText(event.text);
            }
        });
        if (parent instanceof Shell) {
            final Shell shell = (Shell) parent;
            browser.addTitleListener(new TitleListener() {
                public void changed(TitleEvent event) {
                    shell.setText(event.title + " - " + getResourceString("window.title"));
                }
            });
        }
        itemBack.addListener(SWT.Selection, listener);
        itemForward.addListener(SWT.Selection, listener);
        itemStop.addListener(SWT.Selection, listener);
        itemRefresh.addListener(SWT.Selection, listener);
        itemGo.addListener(SWT.Selection, listener);
        location.addListener(SWT.DefaultSelection, new Listener() {
            public void handleEvent(Event e) {
                browser.setUrl(location.getText());
            }
        });

        initialize(display, browser);
        browser.setUrl(getResourceString("Startup"));
    }
}

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