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The Java GUI is event-driven, so we don't actually write a routine that draws lines on the screen in the direct response to the plot command event Instead, we provide a panel whose paint event carries out the plotting when that event is called The previous repaint method ensures that it will be called right away We create a PlotPanel class based on JPanel and derive two classes from it for the actual line and bar plots (Figure 243) Figure 243 The two plot Panel classes derived from PlotPanel
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The base PlotPanel class contains the common code for scaling the data to the window
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public class PlotPanel extends JPanel { private float xfactor, yfactor; private int xpmin, ypmin, xpmax, ypmax; private float minX, maxX, minY, maxY; private float x[], y[]; private Color color; //-------------public void setBounds(float minx, float miny, float maxx, float maxy) { minX = minx; maxX = maxx; minY = miny;
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maxY = maxy; } //-------------public void plot(float[] xp, float[] yp, Color c) { x = xp; //copy in the arrays y = yp; color = c; //and color //compute bounds and scaling factors int w = getWidth() - getInsets()left - getInsets()right; int h = getHeight() - getInsets()top getInsets()bottom; xfactor = (09f * w) / (maxX - minX); yfactor = (09f * h)/ (maxY - minY); xpmin = (int) (005f * w); ypmin = (int) (005f * h); xpmax = w - xpmin; ypmax = h - ypmin; repaint(); //this causes the actual plot } //-------------protected int calcx(float xp) { return(int) ((xp-minX) * xfactor + xpmin); } //-------------protected int calcy(float yp) { int ypnt = (int)((yp-minY) * yfactor); return ypmax - ypnt; } }
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public class LinePlotPanel extends PlotPanel { public void paint(Graphics g) { Superpaint(g); int xp = calcx(x[0]); int yp = calcy(y[0]); gsetColor(Colorwhite); gfillRect(0,0,getWidth(), gsetColor(Colorblack);
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The two derived classes implement the paint method for the two kinds of graphs Here is the one for the Line plot:
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//draw bounding rectangle gdrawRect(xpmin, ypmin, xpmax, ypmax); gsetColor(color); //draw line graph for (int i = 1; i < xlength; i++) { int xp1 = calcx(x[i]); int yp1 = calcy(y[i]); gdrawLine(xp, yp, xp1, yp1); xp = xp1; yp = yp1; } } }
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//get the first point //flood the background getHeight());
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The final two plots are shown in Figure 244 Figure 244 The line graph (left) and the bar graph (right)
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The class diagram is given in Figure 245 Figure 245 The UML class diagram for the PlotStrategy classes Note that the Command pattern is again used
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PlotStrategy is the abstract class, and BarPlotStrategy and LinePlotStrategy are subclasses The containers BarPlotPanel and LinePlotPanel contain instances of these two classes The Context class contains code to select a strategy based on the request from either of the two Command buttons
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Consequences of the Strategy Pattern
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The Strategy pattern allows you to select one of several algorithms dynamically These algorithms may be related in an inheritance hierarchy, or they may be unrelated as long as they implement a common interface Since the Context switches between strategies at your request, you have more flexibility than if you simply call the desired derived class This approach also avoids the sort of condition statements that can make code hard to read and maintain However, Strategies don't hide everything The client code is usually aware that there are a number of alternative strategies, and it has some criteria for choosing from among them This shifts an algorithmic decision to the client programmer or the user You could pass any number of different parameters to different algorithms, so you must develop a Context interface and strategy methods that are broad enough to allow for passing in parameters that are not used by that particular algorithm For example, the setPenColor method in PlotStrategy is actually used only by the LineGraph strategy The BarGraph strategy ignores that method, since it sets up its own list of colors for the successive bars that it draws
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