121 lines
3.5 KiB
Java
121 lines
3.5 KiB
Java
Draw a pie chart
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import java.util.*;
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import java.awt.*;
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import java.applet.Applet;
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public class Graph extends Applet {
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int depth, radius;
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public void init() {
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float value;
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String at = getParameter("width");
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radius = (at != null) ? Integer.valueOf(at).intValue() : 100;
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at = getParameter("depth");
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depth = (at != null) ? Integer.valueOf(at).intValue() : 20;
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at = getParameter("values");
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PieChartCanvas c = new PieChartCanvas(radius, depth);
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setLayout(new BorderLayout());
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// Create Hashtable to map color name (String) to Color type
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Hashtable colors = new Hashtable();
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colors.put("green", Color.green);
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colors.put("red", Color.red);
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colors.put("blue", Color.blue);
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colors.put("yellow", Color.yellow);
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colors.put("magenta", Color.magenta);
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colors.put("cyan", Color.cyan);
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colors.put("orange", Color.orange);
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colors.put("pink", Color.pink);
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colors.put("white", Color.white);
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colors.put("black", Color.black);
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// "value-color,value-color,..."
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StringTokenizer t = new StringTokenizer(at, ",");
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String s;
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int i;
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while (t.hasMoreTokens()) {
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s = t.nextToken();
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i = s.indexOf('-');
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value = Float.valueOf(s.substring(0, i)).floatValue();
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c.addSlice(value, (Color)colors.get(s.substring(i + 1)));
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}
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resize(c.getMinimumSize().width, c.getMinimumSize().height);
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add("Center", c);
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}
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}
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class PieChartCanvas extends Canvas {
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final double aspectFudge = 2.5;
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int radius, depth, called = 1, numSlices = 0;
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float total = 0, value[] = new float[10];
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Color color[] = new Color[10];
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Graphics offGraphics;
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Image gfxBuff;
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public PieChartCanvas(int radius, int depth) {
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this.value = value;
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this.color = color;
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this.radius = radius;
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this.depth = depth;
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}
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public void paint(Graphics g) {
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int startAngle;
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float angle;
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Dimension d = getSize();
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if(gfxBuff == null) {
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gfxBuff = createImage(d.width, d.height);
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offGraphics = gfxBuff.getGraphics();
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offGraphics.setColor(getBackground());
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offGraphics.fillRect(0, 0, d.width, d.height);
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}
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// do the 3d effect
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for(int x = depth; x >= 1; x--) {
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startAngle = -45;
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for(int i = 0; i < numSlices; i++) {
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offGraphics.setColor(color[i].darker());
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angle = Math.round(360 * (value[i] / total));
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offGraphics.fillArc(0, x, radius, (int)(radius / aspectFudge),
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startAngle, (int)angle);
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startAngle += angle;
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}
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}
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// draw the pie slice
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startAngle = -45;
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for(int i = 0; i < numSlices; i++) {
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offGraphics.setColor(color[i]);
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angle = Math.round(360 * (value[i] / total));
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offGraphics.fillArc(0, 0, radius, (int)(radius / aspectFudge),
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startAngle, (int)angle);
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startAngle += angle;
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}
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g.drawImage(gfxBuff, 0, 0, null);
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}
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public void addSlice(float value, Color color) {
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this.value[numSlices] = value;
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this.color[numSlices++] = color;
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total += value;
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}
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public Dimension getPreferredSize() {
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return getMinimumSize();
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}
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public Dimension getMinimumSize() {
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return new Dimension(radius, (int)((radius / aspectFudge) + depth));
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}
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}
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<APPLET CODE=Graph.class WIDTH=150 HEIGHT=150>
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<PARAM NAME="depth" VALUE="30">
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<PARAM NAME="width" VALUE="120">
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<PARAM NAME="values" VALUE="1-red,2-green,3-blue">
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</APPLET>
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