-
Notifications
You must be signed in to change notification settings - Fork 79
Expand file tree
/
Copy pathChart.java
More file actions
132 lines (114 loc) · 3.73 KB
/
Copy pathChart.java
File metadata and controls
132 lines (114 loc) · 3.73 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
package chart;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
/**
* @version 1.33 2007-06-12
* @author Cay Horstmann
*/
public class Chart extends JApplet
{
public void init()
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
String v = getParameter("values");
if (v == null) return;
int n = Integer.parseInt(v);
double[] values = new double[n];
String[] names = new String[n];
for (int i = 0; i < n; i++)
{
values[i] = Double.parseDouble(getParameter("value." + (i + 1)));
names[i] = getParameter("name." + (i + 1));
}
add(new ChartComponent(values, names, getParameter("title")));
}
});
}
}
/**
* A component that draws a bar chart.
*/
class ChartComponent extends JComponent
{
private double[] values;
private String[] names;
private String title;
/**
* Constructs a ChartComponent.
* @param v the array of values for the chart
* @param n the array of names for the values
* @param t the title of the chart
*/
public ChartComponent(double[] v, String[] n, String t)
{
values = v;
names = n;
title = t;
}
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
// compute the minimum and maximum values
if (values == null) return;
double minValue = 0;
double maxValue = 0;
for (double v : values)
{
if (minValue > v) minValue = v;
if (maxValue < v) maxValue = v;
}
if (maxValue == minValue) return;
int panelWidth = getWidth();
int panelHeight = getHeight();
Font titleFont = new Font("SansSerif", Font.BOLD, 20);
Font labelFont = new Font("SansSerif", Font.PLAIN, 10);
// compute the extent of the title
FontRenderContext context = g2.getFontRenderContext();
Rectangle2D titleBounds = titleFont.getStringBounds(title, context);
double titleWidth = titleBounds.getWidth();
double top = titleBounds.getHeight();
// draw the title
double y = -titleBounds.getY(); // ascent
double x = (panelWidth - titleWidth) / 2;
g2.setFont(titleFont);
g2.drawString(title, (float) x, (float) y);
// compute the extent of the bar labels
LineMetrics labelMetrics = labelFont.getLineMetrics("", context);
double bottom = labelMetrics.getHeight();
y = panelHeight - labelMetrics.getDescent();
g2.setFont(labelFont);
// get the scale factor and width for the bars
double scale = (panelHeight - top - bottom) / (maxValue - minValue);
int barWidth = panelWidth / values.length;
// draw the bars
for (int i = 0; i < values.length; i++)
{
// get the coordinates of the bar rectangle
double x1 = i * barWidth + 1;
double y1 = top;
double height = values[i] * scale;
if (values[i] >= 0) y1 += (maxValue - values[i]) * scale;
else
{
y1 += maxValue * scale;
height = -height;
}
// fill the bar and draw the bar outline
Rectangle2D rect = new Rectangle2D.Double(x1, y1, barWidth - 2, height);
g2.setPaint(Color.RED);
g2.fill(rect);
g2.setPaint(Color.BLACK);
g2.draw(rect);
// draw the centered label below the bar
Rectangle2D labelBounds = labelFont.getStringBounds(names[i], context);
double labelWidth = labelBounds.getWidth();
x = x1 + (barWidth - labelWidth) / 2;
g2.drawString(names[i], (float) x, (float) y);
}
}
}