whatifplot.java

一个用于排队系统仿真的开源软件,有非常形象的图象仿真过程!

                    double height = yRange[1] - yRange[0];
                    double newWidth = (xRange[1] - xRange[0])*PLOT_ZOOM_FACTOR;
                    double newHeight = (yRange[1] - yRange[0])*PLOT_ZOOM_FACTOR;
                    double newXMin = xRange[0] + (width - newWidth)/2;
                    //The next 7 lines check that the new range is valid
                    if (newXMin < XBounds[0]) newXMin = XBounds[0];
                    double newXMax = xRange[0] + (width - newWidth)/2 + newWidth;
                    if (newXMax > XBounds[1]) newXMax = XBounds[1];
                    double newYMin = yRange[0] + (height - newHeight)/2;
                    if (newYMin < YBounds[0]) newYMin = YBounds[0];
                    double newYMax = yRange[0] + (height - newHeight)/2 + newHeight;
                    if (newYMax > YBounds[1]) newYMax = YBounds[1];
                    setXRange(newXMin,newXMax);
                    setYRange(newYMin,newYMax);
                    WhatIfPlot.this.repaint();
                }
            });

            zoomOut.addActionListener(new AbstractAction() {
                public void actionPerformed(ActionEvent e) {
                    // Gets maximum and minimum values
                    double[] XBounds = getXAutoRange();
                    double[] YBounds = getYAutoRange();

                    double[] xRange = getXRange();
                    double[] yRange = getYRange();
                    double width = xRange[1] - xRange[0];
                    double height = yRange[1] - yRange[0];
                    double newWidth = (xRange[1] - xRange[0])/PLOT_ZOOM_FACTOR;
                    double newHeight = (yRange[1] - yRange[0])/PLOT_ZOOM_FACTOR;
                    double newXMin = xRange[0] + (width - newWidth)/2;
                    //The next 7 lines check that the new range is valid
                    if (newXMin < XBounds[0]) newXMin = XBounds[0];
                    double newXMax = xRange[0] + (width - newWidth)/2 + newWidth;
                    if (newXMax > XBounds[1]) newXMax = XBounds[1];
                    double newYMin = yRange[0] + (height - newHeight)/2;
                    if (newYMin < YBounds[0]) newYMin = YBounds[0];
                    double newYMax = yRange[0] + (height - newHeight)/2 + newHeight;
                    if (newYMax > YBounds[1]) newYMax = YBounds[1];
                    setXRange(newXMin,newXMax);
                    setYRange(newYMin,newYMax);
                    WhatIfPlot.this.repaint();
                }
            });

            saveAs.addActionListener(new AbstractAction() {
                public void actionPerformed(ActionEvent e) {
                    PlotImagesFileFilter PNGfilter = new PlotImagesFileFilter(".png","Portable Network Graphics images");
                    PlotImagesFileFilter EPSfilter = new PlotImagesFileFilter(".eps","Encapsulated Post Script images");
                    PlotImagesFileChooser fileChooser = new PlotImagesFileChooser(PNGfilter);
                    fileChooser.setFileFilter(PNGfilter);
                    fileChooser.addChoosableFileFilter(EPSfilter);
                    int r = fileChooser.showSaveDialog(WhatIfPlot.this);
                    if (r == JFileChooser.APPROVE_OPTION) {
                        File file = fileChooser.getSelectedFile();
                        if (fileChooser.getFileFilter().equals(EPSfilter)) {
                            WhatIfPlot  plot = WhatIfPlot.this;
                            try {
                                FileOutputStream fileStream = new FileOutputStream(file);
                                plot.export(fileStream);
                                fileStream.close();
                            }
                            catch (FileNotFoundException fnf) {
                                JOptionPane.showMessageDialog(fileChooser,"File not found","JMT - Error",JOptionPane.ERROR_MESSAGE);
                            }
                            catch (IOException ioe) {
                                JOptionPane.showMessageDialog(fileChooser,"I/O exception","JMT - Error",JOptionPane.ERROR_MESSAGE);
                            }
                        }
                        else {
                            WhatIfPlot  plot = WhatIfPlot.this;
                            BufferedImage image = plot.exportImage();
                            try{
                                BufferedImage originalImage = convertType(image, BufferedImage.TYPE_INT_RGB);
                                ImageIO.write(originalImage,"png",file);
                                ImageIO.createImageOutputStream(file).close();
                            }
                            catch (IOException fnf) {
                                JOptionPane.showMessageDialog(null,"File not found");
                            }
                        }
                    }
                }

            });
        }

        BufferedImage convertType(BufferedImage src, int targetType) {
                if (src.getType() == targetType)
                return src;
            BufferedImage tgt = new BufferedImage(src.getWidth(), src.getHeight(), targetType);
            Graphics2D g = tgt.createGraphics();
            g.drawRenderedImage(src, null);
            g.dispose();
            return tgt;
        }
    }

    /**
     * Custom file chooser class
     */
    protected static class PlotImagesFileChooser extends JFileChooser {
        protected PlotImagesFileFilter defaultFilter;
        /**
         * Creates a File chooser in the appropriate directory user deafault.
         * @param defaultFilter default file filter
         */
        public PlotImagesFileChooser(PlotImagesFileFilter defaultFilter) {
            super(new File(System.getProperty("user.dir")));
            this.defaultFilter = defaultFilter;
        }

        /**
         * Overrides default method to provide a warning if saving over an existing file
         */
        public void approveSelection() {
            // Gets the choosed file name
            String name = getSelectedFile().getName();
            String parent = getSelectedFile().getParent();
            if (getDialogType() == OPEN_DIALOG) {
                super.approveSelection();
            }
            if (getDialogType() == SAVE_DIALOG) {
                PlotImagesFileFilter used = ((PlotImagesFileFilter)this.getFileFilter());
                if (!name.toLowerCase().endsWith(used.getExtension())) {
                    name = name + used.getExtension();
                    setSelectedFile(new File(parent, name));
                }
                if (getSelectedFile().exists()) {
                    int resultValue = JOptionPane.showConfirmDialog(this,
                            "<html>File <font color=#0000ff>" + name + "</font> already exists in this folder.<br>Do you want to replace it?</html>",
                            "JMT - Warning",
                            JOptionPane.OK_CANCEL_OPTION,
                            JOptionPane.WARNING_MESSAGE);
                    if (resultValue == JOptionPane.OK_OPTION) {
                        getSelectedFile().delete();
                        super.approveSelection();
                    }
                } else {
                    super.approveSelection();
                }
            }
        }
    }

    /**
     * Inner class used to create simple file filters with only extension check
     */
    protected static class PlotImagesFileFilter extends javax.swing.filechooser.FileFilter {
        private String extension, description;

        /**
         * Creates a new filefilter with specified extension and description
         * @param extension extension of this filter (for example ".jmt")
         * @param description description of this filter
         */
        public PlotImagesFileFilter(String extension, String description) {
            this.extension = extension;
            this.description = description;
        }
        /**
         * Whether the given file is accepted by this filter.
         */
        public boolean accept(File f) {
            String name = f.getName().toLowerCase();
            return name.endsWith(extension) || f.isDirectory();
        }
        /**
         * The description of this filter
         * @see javax.swing.filechooser.FileView#getName
         */
        public String getDescription() {
            return description + " (*" + extension + ")";
        }

        /**
         * Gets extension of this filter
         * @return extension of this filter
         */
        public String getExtension() {
            return extension;
        }
    }
// ----------------------------------------------------------------------------------------
}