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8: Statistics, Graphing, and Java
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These variables will define the data area within the window.
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The Graphs Constructor
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The Graphs constructor takes two arguments. The first specifies a reference to the data being displayed. The second is a value that indicates the style of the graph. This value must be Graph.BAR, Graph.SCATTER, or Graph.REGPLOT. Graphs( ) begins by adding an event listener for the window-closing event, as shown here:
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// Handle window-closing events. addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { setVisible(false); dispose(); } });
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The listener is added by calling addWindowListener( ), passing a WindowAdapter object that overrides the windowClosing( ) event handler. Recall that an adapter class provides an empty implementation for all the methods in its corresponding event listener interface. In this specific case, WindowAdapter implements the WindowListener interface. Because empty implementations for all of the methods specified by WindowListener are provided by WindowAdapter, we need override only the one in which we are interested, which is windowClosing( ). When the window is closed, the graph window is removed from view by calling setVisible(false) and then removed from the system by calling dispose( ). These are methods defined by the AWT for Frame windows. Next, an event listener is added that handles window-resize events. This is done by calling addComponentListener( ), passing a ComponentAdapter object that overrides the componentResized( ) event handler, as shown here:
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// Handle resize events. addComponentListener(new ComponentAdapter() { public void componentResized(ComponentEvent ce) { repaint(); } });
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When the window is resized, componetResized( ) calls repaint( ), which causes the paint( ) method to be called. As you will see, paint( ) dynamically scales the output based on the current window size. Thus, when the window is resized, paint( ) simply redisplays the graph using the new dimensions. Next, graphStyle is assigned the graph style, and data is assigned a reference to the array of data. Then, a temporary copy of the data is created and sorted. From this sorted array, the
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minimum and maximum values are obtained. The lines of code that accomplish these actions are shown here:
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graphStyle = style; data = vals; // Sort the data to find min and max values. double t[] = new double[vals.length]; System.arraycopy(vals, 0, t, 0, vals.length); Arrays.sort(t); min = t[0]; max = t[t.length-1];
The Graphs constructor ends with these lines of code:
setSize(new Dimension(200, 120)); switch(graphStyle) { case BAR: setTitle("Bar Graph"); setLocation(25, 250); break; case SCATTER: setTitle("Scatter Graph"); setLocation(250, 250); break; case REGPLOT: setTitle("Regression Plot"); setLocation(475, 250); break; } setVisible(true);
The initial size of the graph window is set to 200 by 120 by calling setSize( ). Then, based on graphStyle, the title bar is assigned an appropriate title by calling setTitle( ), and a screen location is set by calling setLocation( ). Finally, the graph window is displayed by calling setVisible(true). This causes paint( ) to be called to display the window.
The paint( ) method
Much of the work related to displaying a graph takes place in paint( ). It performs the following main activities: Determines the size of the window and the size of the border
8: Statistics, Graphing, and Java
Obtains the size of the currently selected text font Computes the size of the data area within the window, which is the size of the window less the regions occupied by the window border and insets Computes the scaling factor Computes the Y coordinate of the baseline, which is the X axis Determines the spacing between data points Draws the baseline and the Y axis Displays the maximum and minimum X and Y values Calls the appropriate method to actually plot the data The comments in paint( ) describe the action in detail, and much is self-explanatory. However, because of its importance, we will walk through its operation line by line. The paint( ) method begins with these two declarations:
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