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/Users/lyon/j4p/src/bookExamples/ch27BusinessGraphics/charts/LineGraph.java
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1 package bookExamples.ch27BusinessGraphics.charts;
2
3 import gui.ClosableJFrame;
4
5 import javax.swing.*;
6 import java.awt.*;
7
8 /**
9 * LineGraph implements the Paintable interface to draw a line
10 * graphics.graph on a frame. <BR>
11 * Global variables:
12 * <UL>
13 * <LI> DoubleDataBean: instance of DoubleDataBean so the graphics.graph is drawn
14 * with the proper data
15 * </UL>
16 *
17 * @author Allison McHenry
18 * @author Douglas Lyon, PhD
19 * @since JDK 1.3
20 */
21
22 public class LineGraph extends JComponent
23 implements Paintable {
24
25 //GLOBAL VARIABLES
26 private DoubleDataBean dd;
27
28 //CONSTRUCTORS
29 /**
30 * Default constructor, used to instantiate an instance of LineGraph by
31 * the testing class
32 *
33 * @param _dd instance of DoubleDataBean used to draw the graphics.graph
34 */
35 public LineGraph(DoubleDataBean _dd) {
36 dd = _dd;
37 setSize(dd.getWidth(), dd.getHeight());
38 }
39
40 public Dimension getPreferredSize() {
41 return new Dimension(dd.getWidth(), dd.getHeight());
42 }
43
44 public Dimension getMinimumSize() {
45 return new Dimension(dd.getWidth(), dd.getHeight());
46 }
47
48 //UTILITY METHODS
49
50 /**
51 * Actually paints this data from DoubleDataBean onto an image. The DrawUtil class is a
52 * generic utilities class containing all methods which actually
53 * handle the painting.
54 *
55 * @param g Graphics context for drawing
56 * @see DrawUtil.#drawGrid
57 * @see DrawUtil.#drawTicks
58 * @see DrawUtil.#drawAxes2
59 * @see DrawUtil.#drawXAxisLabel
60 * @see DrawUtil.#drawYAxisLabel
61 * @see DrawUtil.#drawTitle
62 * @see DrawUtil.#drawLine
63 */
64 public void paint(Graphics g) {
65 DrawUtil du = new DrawUtil(dd);
66 Ticks t = new Ticks(dd, getSize());
67 t.paint(g);
68 drawGraph(g);
69 du.drawXAxisLabel(g);
70 du.drawYAxisLabel(g);
71 du.drawTitle(g);
72
73 System.out.println("Successfully drawing line graphics.graph");
74 }
75
76
77 /**
78 * Draws the line for the line graphics.graph.
79 *
80 * @param g Graphics context for drawing
81 * @see LineGraph.#paint
82 * @see DoubleDataBean.#getXScreenCoords2
83 * @see DoubleDataBean.#getYScreenCoords2
84 * @see java.awt.#drawPolyline
85 */
86 private void drawGraph(Graphics g) {
87 // actual code
88 g.setColor(Color.red);
89 Polygon p = getPolygon();
90 g.drawPolyline(p.xpoints, p.ypoints, p.npoints);
91
92 }
93
94 /**
95 * Method used to by the line graphics.graph to convert entered X data
96 * to data appropriate for drawing on the screen
97 * (incremented to fit in the available screen size, corrected for offset, etc)
98 *
99 * @return Xs The new data array
100 * @see LineGraph.#drawGraph
101 */
102
103 private int[] getXScreenCoords() {
104 double[] xVals = dd.getXVals();
105 int xLength = xVals.length;
106 int width = dd.getWidth();
107 double deltaX = dd.getDeltaX();
108 double xOrigin = dd.getXAxisCoord();
109 double xIncrement = dd.getIncrementNew(xVals, width);
110 double maxX = dd.getMax(xVals);
111
112 int Xs[] = new int[xLength];
113
114 if (maxX > 0) {
115 for (int i = 0; i < xLength; i++) {
116 Xs[i] = (int) (xIncrement * xVals[i]) + (int) xOrigin;
117
118 }
119 } else {
120 for (int i = 0; i < xLength; i++) {
121 Xs[i] = width - ((int) (xIncrement * xVals[i]));
122
123 }
124 }
125 return Xs;
126
127 }
128
129 /**
130 * Method used to by the line graphics.graph to convert entered Y data
131 * to data appropriate for drawing on the screen
132 * (incremented to fit in the available screen size, corrected for offset, etc)
133 *
134 * @return Ys The new data array
135 * @see LineGraph.#drawGraph
136 */
137 private int[] getYScreenCoords() {
138 double[] yVals = dd.getYVals();
139 int height = dd.getHeight();
140 int yLength = yVals.length;
141 double deltaY = dd.getDeltaY();
142 double yIncrement = dd.getYIncrement();
143 int Ys[] = new int[yLength];
144 double maxY = dd.getMax(yVals);
145
146 double yOrigin = dd.getYAxisCoord();
147
148 for (int i = 0; i < yLength; i++) {
149 Ys[i] = (int) (yOrigin - (yVals[i] * yIncrement)); // +Y_OFFSET
150 }
151
152 return Ys;
153
154 }
155
156 private Polygon getPolygon() {
157 return new Polygon(getXScreenCoords(),
158 getYScreenCoords(), getXScreenCoords().length);
159 }
160
161 public static void main(String args[]) {
162 ClosableJFrame cf = new ClosableJFrame();
163 Container c = cf.getContentPane();
164 double numberOfPoints = 100;
165 double eps = (2 * Math.PI + .1) / numberOfPoints;
166 double theta = 0;
167 double x[] = new double[(int) numberOfPoints];
168 double y[] = new double[x.length];
169 for (int i = 0; i < x.length; i++) {
170 x[i] = Math.cos(theta);
171 y[i] = Math.sin(theta);
172 theta = theta + eps;
173 }
174
175 //double xes[] = new double[]{-10,-20,-30,-40};
176 //double yes[] = new double[] {10,20,30,40};
177 DoubleDataBean dd = new DoubleDataBean(200, 200);
178 dd.setXLabel("x label");
179 dd.setYLabel("y label");
180 dd.setXVals(x);
181 dd.setYVals(y);
182 LineGraph lg = new LineGraph(dd);
183 c.add(lg);
184 c.setLayout(
185 new FlowLayout());
186 c.setBackground(Color.white);
187 cf.setSize(200, 200);
188 cf.setVisible(true);
189 }
190
191 }
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