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g.drawLine(left, baseline, left + (data.length-1) * hGap, baseline); // Draw the Y axis. if(graphStyle != BAR) g.drawLine(left, winSize.height-bottom, left, top); // Display the min, max, and 0 values. g.drawString("0", ins.left, baseline+fm.getAscent()/2); if(max != 0) g.drawString("" + max, ins.left, baseline (int) (max*scale) - 4); if(min != 0) g.drawString("" + min, ins.left, baseline (int) (min*scale)+fm.getAscent()); // Display number of values. g.drawString("" + data.length, (data.length-1) * (hGap) + left, baseline + fm.getAscent()); // Set the data color. g.setColor(dataColor); // Display the data. switch(graphStyle) { case BAR: bargraph(g); break; case SCATTER: scatter(g); break; case REGPLOT: regplot(g); break; } } // Display a bar graph. private void bargraph(Graphics g) { int v; for(int i=0; i < data.length; i++) { v = (int) (data[i] * scale);
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g.drawLine(i*hGap+left, baseline, i*hGap+left, baseline - v); } } // Display a scatter graph. private void scatter(Graphics g) { int v; for(int i=0; i < data.length; i++) { v = (int) (data[i] * scale); g.drawRect(i*hGap+left, baseline - v, 1, 1); } } // Display a scatter graph with regression line. private void regplot(Graphics g) { int v; RegData rd = Stats.regress(data); for(int i=0; i < data.length; i++) { v = (int) (data[i] * scale); g.drawRect(i*hGap+left, baseline - v, 1, 1); } // Draw the regression line. g.drawLine(left, baseline - (int) ((rd.a)*scale), hGap*(data.length-1)+left+1, baseline - (int) ((rd.a+(rd.b*(data.length-1)))*scale)); } }
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The Graphs final and Instance Variables
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Graphs begins by declaring the following variables:
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// Constants public final public final public final for type of graph. static int BAR = 0; static int SCATTER = 1; static int REGPLOT = 2;
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private int graphStyle;
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The first three final static variables are called BAR, SCATTER, and REGPLOT. These values are used to specify which type of graph you want to display. The style of the graph is stored in graphStyle. Next, variables that hold the width of the gap between the window borders and the start of the area in which data is displayed are declared, as shown here:
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/* These specify the amount of space to leave between data and borders. */ private final int leftGap = 2; private final int topGap = 2; private final int bottomGap = 2; private int rightGap; // this value is computed
Three are final, but rightGap is not because its value depends on the current character width and the number of data items being displayed. Next the following variables are declared:
// These hold the min and max values of the data. private double min, max; // Refers to the data. private double[] data;
The min and max variables hold the minimum and maximum values of the data. The array holding the data is referred to by data. The colors used by the graph are stored in gridColor and dataColor, shown next:
// Colors used by the graph. Color gridColor = new Color(0, 150, 150); Color dataColor = new Color(0, 0, 0);
The grid color is light green, and the data color is black, but you can change these colors if you want. Next, variables that hold various scaling-related values are declared, as shown here:
// Various values used to scale and display data. private int hGap; // space between data points private int spread; // distance between min and max data private double scale; // scaling factor private int baseline; // vertical coordinate of baseline
The distance between data points along the X-axis is stored in hGap. The number of units between the minimum and maximum values in the data is stored in spread. The scaling factor is held by scale. The vertical location of the baseline (i.e., the X axis) is stored in baseline. Finally, top, bottom, left, and right are declared:
// Location of data area within the window. private int top, bottom, left, right;
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