chartcomposite.java

java图形利器

        if (this.info != null) {
            EntityCollection entities = this.info.getEntityCollection();
            if (entities != null) {
                Rectangle insets = getClientArea();
                ChartEntity entity = entities.getEntity(
                        (int) ((e.x - insets.x) / this.scaleX),
                        (int) ((e.y - insets.y) / this.scaleY));
                if (entity != null) {
                    result = entity.getToolTipText();
                }
            }
        }
        return result;

    }

    /**
     * The idea is to modify the zooming options depending on the type of chart 
     * being displayed by the panel.
     *
     * @param x  horizontal position of the popup.
     * @param y  vertical position of the popup.
     */
    protected void displayPopupMenu(int x, int y) {
        if (this.popup != null) {
            // go through each zoom menu item and decide whether or not to 
            // enable it...
            Plot plot = this.chart.getPlot();
            boolean isDomainZoomable = false;
            boolean isRangeZoomable = false;
            if (plot instanceof Zoomable) {
                Zoomable z = (Zoomable) plot;
                isDomainZoomable = z.isDomainZoomable();
                isRangeZoomable = z.isRangeZoomable();
            }
            if (this.zoomInDomainMenuItem != null) {
                this.zoomInDomainMenuItem.setEnabled(isDomainZoomable);
            }
            if (this.zoomOutDomainMenuItem != null) {
                this.zoomOutDomainMenuItem.setEnabled(isDomainZoomable);
            } 
            if (this.zoomResetDomainMenuItem != null) {
                this.zoomResetDomainMenuItem.setEnabled(isDomainZoomable);
            }

            if (this.zoomInRangeMenuItem != null) {
                this.zoomInRangeMenuItem.setEnabled(isRangeZoomable);
            }
            if (this.zoomOutRangeMenuItem != null) {
                this.zoomOutRangeMenuItem.setEnabled(isRangeZoomable);
            }

            if (this.zoomResetRangeMenuItem != null) {
                this.zoomResetRangeMenuItem.setEnabled(isRangeZoomable);
            }

            if (this.zoomInBothMenuItem != null) {
                this.zoomInBothMenuItem.setEnabled(
                    isDomainZoomable & isRangeZoomable
                );
            }
            if (this.zoomOutBothMenuItem != null) {
                this.zoomOutBothMenuItem.setEnabled(
                    isDomainZoomable & isRangeZoomable
                );
            }
            if (this.zoomResetBothMenuItem != null) {
                this.zoomResetBothMenuItem.setEnabled(
                    isDomainZoomable & isRangeZoomable
                );
            }

            this.popup.setLocation(x, y);
            this.popup.setVisible(true);
        }

    }

    /**
     * Creates a print job for the chart.
     */
    public void createChartPrintJob() {
        //FIXME try to replace swing print stuff by swt
        PrinterJob job = PrinterJob.getPrinterJob();
        PageFormat pf = job.defaultPage();
        PageFormat pf2 = job.pageDialog(pf);
        if (pf2 != pf) {
            job.setPrintable(this, pf2);
            if (job.printDialog()) {
                try {
                    job.print();
                }
                catch (PrinterException e) {
                    MessageBox messageBox = new MessageBox( 
                            canvas.getShell(), SWT.OK | SWT.ICON_ERROR );
                    messageBox.setMessage( e.getMessage() );
                    messageBox.open();
                }
            }
        }
    }

    /**
     * Creates a popup menu for the canvas.
     *
     * @param properties  include a menu item for the chart property editor.
     * @param save  include a menu item for saving the chart.
     * @param print  include a menu item for printing the chart.
     * @param zoom  include menu items for zooming.
     *
     * @return The popup menu.
     */
    protected Menu createPopupMenu(boolean properties, boolean save, 
            boolean print, boolean zoom) {
        
        Menu result = new Menu(this);
        boolean separator = false;

        if ( properties ) {
            MenuItem propertiesItem = new MenuItem(result, SWT.PUSH);
            propertiesItem.setText(localizationResources.getString(
                    "Properties..."));
            propertiesItem.setData(PROPERTIES_COMMAND);
            propertiesItem.addSelectionListener(this);
            separator = true;
        }
        if (save) 
        {
            if (separator) {
                new MenuItem(result, SWT.SEPARATOR);
                separator = false;
            }
            MenuItem saveItem = new MenuItem(result, SWT.NONE);
            saveItem.setText(localizationResources.getString("Save_as..."));
            saveItem.setData(SAVE_COMMAND);
            saveItem.addSelectionListener(this);
            separator = true;
        }
        if (print) {
            if (separator) {
                new MenuItem(result, SWT.SEPARATOR);
                separator = false;
            }
            MenuItem printItem = new MenuItem(result, SWT.NONE);
            printItem.setText(localizationResources.getString("Print..."));
            printItem.setData(PRINT_COMMAND);
            printItem.addSelectionListener(this);
            separator = true;
        }
        if (zoom) {
            if (separator) {
                new MenuItem(result, SWT.SEPARATOR);
                separator = false;
            }

            Menu zoomInMenu = new Menu(result);
            MenuItem zoomInMenuItem = new MenuItem(result, SWT.CASCADE);
            zoomInMenuItem.setText(localizationResources.getString("Zoom_In"));
            zoomInMenuItem.setMenu(zoomInMenu);

            this.zoomInBothMenuItem = new MenuItem(zoomInMenu, SWT.PUSH);
            this.zoomInBothMenuItem.setText(localizationResources.getString(
                    "All_Axes"));
            this.zoomInBothMenuItem.setData(ZOOM_IN_BOTH_COMMAND);
            this.zoomInBothMenuItem.addSelectionListener(this);

            new MenuItem(zoomInMenu, SWT.SEPARATOR);

            this.zoomInDomainMenuItem = new MenuItem(zoomInMenu, SWT.PUSH);
            this.zoomInDomainMenuItem.setText(localizationResources.getString(
                    "Domain_Axis" ) );
            this.zoomInDomainMenuItem.setData(ZOOM_IN_DOMAIN_COMMAND);
            this.zoomInDomainMenuItem.addSelectionListener(this);

            this.zoomInRangeMenuItem = new MenuItem(zoomInMenu, SWT.PUSH);
            this.zoomInRangeMenuItem.setText(localizationResources.getString(
                    "Range_Axis" ) );
            this.zoomInRangeMenuItem.setData(ZOOM_IN_RANGE_COMMAND);
            this.zoomInRangeMenuItem.addSelectionListener(this);

            Menu zoomOutMenu = new Menu( result );
            MenuItem zoomOutMenuItem = new MenuItem(result, SWT.CASCADE);
            zoomOutMenuItem.setText(localizationResources.getString(
                    "Zoom_Out"));
            zoomOutMenuItem.setMenu(zoomOutMenu);

            this.zoomOutBothMenuItem = new MenuItem(zoomOutMenu, SWT.PUSH);
            this.zoomOutBothMenuItem.setText(localizationResources.getString(
                    "All_Axes"));
            this.zoomOutBothMenuItem.setData(ZOOM_OUT_BOTH_COMMAND);
            this.zoomOutBothMenuItem.addSelectionListener(this);
            
            new MenuItem(zoomOutMenu, SWT.SEPARATOR);

            this.zoomOutDomainMenuItem = new MenuItem(zoomOutMenu, SWT.PUSH);
            this.zoomOutDomainMenuItem.setText(localizationResources.getString(
                    "Domain_Axis"));
            this.zoomOutDomainMenuItem.setData(ZOOM_OUT_DOMAIN_COMMAND);
            this.zoomOutDomainMenuItem.addSelectionListener( this );

            this.zoomOutRangeMenuItem = new MenuItem(zoomOutMenu, SWT.PUSH);
            this.zoomOutRangeMenuItem.setText(
                    localizationResources.getString("Range_Axis"));
            this.zoomOutRangeMenuItem.setData(ZOOM_OUT_RANGE_COMMAND);
            this.zoomOutRangeMenuItem.addSelectionListener(this);

            Menu autoRangeMenu = new Menu(result);
            MenuItem autoRangeMenuItem = new MenuItem(result, SWT.CASCADE);
            autoRangeMenuItem.setText(localizationResources.getString(
                    "Auto_Range"));
            autoRangeMenuItem.setMenu(autoRangeMenu);

            this.zoomResetBothMenuItem = new MenuItem(autoRangeMenu, SWT.PUSH);
            this.zoomResetBothMenuItem.setText(localizationResources.getString(
                    "All_Axes"));
            this.zoomResetBothMenuItem.setData(ZOOM_RESET_BOTH_COMMAND);
            this.zoomResetBothMenuItem.addSelectionListener(this);
            
            new MenuItem(autoRangeMenu, SWT.SEPARATOR);

            this.zoomResetDomainMenuItem = new MenuItem(autoRangeMenu, 
                    SWT.PUSH);
            this.zoomResetDomainMenuItem.setText(
                    localizationResources.getString("Domain_Axis"));
            this.zoomResetDomainMenuItem.setData(ZOOM_RESET_DOMAIN_COMMAND);
            this.zoomResetDomainMenuItem.addSelectionListener(this);
               
            this.zoomResetRangeMenuItem = new MenuItem(autoRangeMenu, SWT.PUSH);
            this.zoomResetRangeMenuItem.setText(
                    localizationResources.getString("Range_Axis"));
            this.zoomResetRangeMenuItem.setData(ZOOM_RESET_RANGE_COMMAND);
            this.zoomResetRangeMenuItem.addSelectionListener(this);
        }
        
        return result;
    }

    /**
     * Handles action events generated by the popup menu.
     *
     * @see org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(
     * org.eclipse.swt.events.SelectionEvent)
     */
    public void widgetDefaultSelected(SelectionEvent e) {
        // TODO Auto-generated method stub
        
    }

    /**
     * Handles action events generated by the popup menu.
     *
     * @see org.eclipse.swt.events.SelectionListener#widgetSelected(
     * org.eclipse.swt.events.SelectionEvent)
     */
    public void widgetSelected(SelectionEvent e) {
        String command = (String) ((MenuItem) e.getSource()).getData();
        if (command.equals(PROPERTIES_COMMAND)) {
            attemptEditChartProperties();
        }
        else if (command.equals(SAVE_COMMAND)) {
            try {
                doSaveAs();
            }
            catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        else if (command.equals(PRINT_COMMAND)) {
            createChartPrintJob();
        }
        /* in the next zoomPoint.x and y replace by e.x and y for now. 
         * this helps to handle the mouse events and besides, 
         * those values are unused AFAIK. */
        else if (command.equals(ZOOM_IN_BOTH_COMMAND)) {
            zoomInBoth( e.x, e.y );
        }
        else if (command.equals(ZOOM_IN_DOMAIN_COMMAND)) {
            zoomInDomain( e.x, e.y );
        }
        else if (command.equals(ZOOM_IN_RANGE_COMMAND)) {
            zoomInRange( e.x, e.y );
        }
        else if (command.equals(ZOOM_OUT_BOTH_COMMAND)) {
            zoomOutBoth( e.x, e.y );
        }
        else if (command.equals(ZOOM_OUT_DOMAIN_COMMAND)) {
            zoomOutDomain( e.x, e.y );
        }
        else if (command.equals(ZOOM_OUT_RANGE_COMMAND)) {
            zoomOutRange( e.x, e.y );
        }
        else if (command.equals(ZOOM_RESET_BOTH_COMMAND)) {
            restoreAutoBounds();
        }
        else if (command.equals(ZOOM_RESET_DOMAIN_COMMAND)) {
            restoreAutoDomainBounds();
        }
        else if (command.equals(ZOOM_RESET_RANGE_COMMAND)) {
            restoreAutoRangeBounds();
        }
        this.forceRedraw();
    }

    public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) 
        throws PrinterException {
        if (pageIndex != 0) {
            return NO_SUCH_PAGE;
        }
        /*
        CairoImage image = new CairoImage( 
                this.getBounds().width, this.getBounds().height );
        Graphics2D g2 = image.createGraphics2D();
        double x = pageFormat.getImageableX();
        double y = pageFormat.getImageableY();
        double w = pageFormat.getImageableWidth();
        double h = pageFormat.getImageableHeight();
        this.chart.draw(
            g2, new Rectangle2D.Double(x, y, w, h), this.anchor, null
        );
        */
        return PAGE_EXISTS;
    }
    
}