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超链接的饼形统计图
程序说明：
这是一个实用的Java Applet饼形统计图程序。可以根据点击的饼形图中的扇形块进行超文本链接，其中饼形图中的数据、图例、图表大小、标题、颜色、背景和超链接都可以用程序所带参数进行设置。
// 程序名称：PieChart
// 描述：创建饼形统计图
// 平台：UNIX，WINDOWS
// 参数:
// V0, V1, V2, etc... 代表饼形统计图中的数据
// T0, T1, T2, etc... 代表饼形统计图中数据对应的标题
// U0, U1, U2, etc... 代表饼形统计图中扇形快的URL链接，无该参数，则无链接
// URLOutside
// 点击的饼形图外时对应的URL链接，默认值无链接
// ChartTitle
// 饼形统计图标题
// TitleTextColor
// 标题颜色
// TitleFontSize
// 标题文本大小，默认值为14号字
// LegendTextColor
// 图例文本颜色，默认值为红色
// LegendFontSize
// 图例文本大小，默认值为14号字
// PieTextColor
// 饼图标签文本颜色，默认值为白色
// PieFontSize
// 饼图标签文本大小，默认值为14号字
// BackgroundColor
// 饼图背景颜色，默认值为白色
// Background
// 饼图背景图象对应的URL链接，该参数和参数"BackgroundColor"不能同时存在，背景图象平铺在饼图的后面
// FontName
// 饼图所选用字体名称，默认值为Helvetica
// Tips
// 该逻辑为真表示，当鼠标移过饼图时显示饼图数据。默认值为真
import java.awt.*;
import java.awt.image.ImageObserver;
import java.applet.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.awt.Frame;
public class PieChart extends Applet
{
String fontName;
Color legendTextColor,pieTextColor,titleTextColor,backgroundColor;
Image backgroundImage = null;
Dimension imageDimensions;
double values[] = new double[100];
String[] titles = new String[100];
URL urls[] = new URL[100];
URL URLoutside = null;
int valuesSize = 0;
Font legendFont,titleFont,pieFont;
int legendFontSize,titleFontSize,pieFontSize;
Color c[] = new Color[14];
Rectangle r;
String chartTitle;
int topmargin = 10;
int rightmargin = 10;
int pieSize = 0,xPos = 0,yPos = 0;
int mouseSelAngle = -1;
double sum, factor;
Graphics g2;
Image offScreenImage = null;
int xMousePos = -1, yMousePos = -1;
int curPiece = -1;
boolean wantTips = true;
Frame parentFrame = null;
public PieChart()
{
}
public String getAppletInfo()
{
return "Name: PieChart\r\n" +
"Author: Gary T. Desrosiers\r\n" +
"Copyright (C) 1996 Gary T. Desrosiers\r\n" +
"All rights reserved";
}
public String[][] getParameterInfo()
{
String[][] info =
{
{ "V0 thru Vn", "Double", "values for pie chart" },
{ "T0 thru Tn", "String", "Titles for each value to display in legend" },
{ "U0 thru Un", "String", "URL to hyperlink when pie piece is clicked." },
{ "URLOutside", "String", "URL to hyperlink when user clicks outside pie" },
{ "ChartTitle","String","Title of the pie chart" },
{ "TitleTextColor","String","Color of the title" },
{ "TitleFontSize","Int","Size of chart tile font" },
{ "LegendTextColor","String","Color of the ledend text" },
{ "LegendFontSize","Int","Size of legend font" },
{ "PieTextColor","String","Color of text labeling pie chart" },
{ "PieFontSize","Int","Size of text labeling pie chart" },
{ "BackgroundColor","String","Color of the background" },
{ "Background","String","relative URL to background image" },
{ "FontName","String","Name of font to use, default is Helvetica" },
{ "Tips","Boolean","True/False - values displayed as user moves mouse over chart" },
};
return info;
}
public boolean imageUpdate(Image img,int infoflags,int x,int y,int width,int height)
{
if((infoflags & ImageObserver.ALLBITS) != 0) {
imageDimensions = getImageDimensions(backgroundImage);
repaint();
return false;
}
return true;
}
public void init()
{
String param;
int i;
c[0] = Color.green;
c[1] = Color.blue;
c[2] = Color.orange;
c[2] = new Color(255,255,128); // pale yellow
c[3] = new Color(0,128,0); // half green
c[4] = new Color(128,0,255); // purple
c[5] = new Color(0,0,160); // dark blue
c[6] = Color.red;
c[7] = new Color(128,192,192); // steel blue
c[8] = new Color(64,128,128); // kackki
c[9] = new Color(128,255,255); // aqua
c[10] = new Color(255,128,192); // pale pink
c[11] = Color.white;
c[12] = Color.darkGray;
c[13] = new Color(255,128,255); // pink
fontName = (param = getParameter("FontName")) == null ? "Helvetica" : param;
legendFontSize = (param = getParameter("LegendFontSize")) == null ? 14 : Integer.parseInt(param);
legendFont = new Font(fontName, Font.BOLD, legendFontSize);
titleFontSize = (param = getParameter("titleFontSize")) == null ? 14 : Integer.parseInt(param);
titleFont = new Font(fontName, Font.BOLD, titleFontSize);
pieFontSize = (param = getParameter("PieFontSize")) == null ? 14 : Integer.parseInt(param);
pieFont = new Font(fontName, Font.BOLD, pieFontSize);
chartTitle = (param = getParameter("ChartTitle")) == null ? "" : param;
i = 0;
while((param = getParameter("V"+i)) != null)
{
values[i] = Double.valueOf(param).doubleValue();
titles[i] = getParameter("T"+i);
param = getParameter("U"+i);
if(param == null)
urls[i] = null;
else
try
{
urls[i] = new URL(param);
}
catch(MalformedURLException e) { urls[i] = null; }
i++;
}
valuesSize = i;
sum = 0;
for(i=0;i<valuesSize;i++)
sum += values[i];
factor = 360.0 / sum;
param = getParameter("URLOutside");
if(param != null)
try {
URLoutside = new URL(param);
} catch(MalformedURLException e) {
URLoutside = null;
}
try
{
param = getParameter("Background");
if (param != null)
{
backgroundImage = getImage(new URL(getDocumentBase(),param));
imageDimensions = getImageDimensions(backgroundImage);
}
} catch(MalformedURLException e)
{
backgroundImage = null;
}
legendTextColor = (param = getParameter("LegendTextColor")) == null ? Color.red : convertColor(param);
pieTextColor = (param = getParameter("PieTextColor")) == null ? Color.white : convertColor(param);
titleTextColor = (param = getParameter("TitleTextColor")) == null ? Color.yellow : convertColor(param);
backgroundColor = (param = getParameter("BackgroundColor")) == null ? Color.black : convertColor(param);
wantTips = (param = getParameter("Tips")) == null ? true : new Boolean(true).getBoolean(param);
offScreenImage = createImage(size().width, size().height);
g2 = offScreenImage.getGraphics();
r = bounds();
parentFrame = getParentFrame();
}
private Frame getParentFrame()
{
Component p=this;
while(((p=p.getParent())!=null) && !(p instanceof Frame));
return (Frame)p;
}
public void destroy()
{
}
public void paint(Graphics g)
{
Rectangle d = bounds();
if((d.height != r.height) || (d.width != r.width))
{
offScreenImage = createImage(size().width, size().height);
g2 = offScreenImage.getGraphics();
r = bounds();
}
update(g);
}
public synchronized void update(Graphics g)
{
double anglerr = 0;
double curVal;
int startAngle = 0;
int tipAngle = -1, tip = -1;
//r = bounds();
pieSize = r.height-topmargin-rightmargin-(2*g2.getFontMetrics(pieFont).getHeight());
if (backgroundImage != null)
{
if((imageDimensions.width != -1) && (imageDimensions.height != -1))
{
int x = 0, y = 0;
for(x=0;x<size().width;x+=imageDimensions.width)
for(y=0;y<size().height;y+=imageDimensions.height)
g2.drawImage(backgroundImage, x, y, this);
}
} else
{
g2.setColor(backgroundColor);
g2.fillRect(0,0,r.width,r.height);
}
startAngle = 0;
anglerr = 0;
xPos = r.width-r.height-rightmargin;
yPos = topmargin+g2.getFontMetrics(pieFont).getHeight();
int sx = 10;
int sy = r.height - getFontMetrics(legendFont).getHeight();
int legendFontHeight = getFontMetrics(legendFont).getHeight();
for(int i=0;i<valuesSize;i++)
{
curVal = values[i]*factor;
anglerr += (int)curVal;
g2.setColor(c[i%c.length]);
if(i == (valuesSize-1))
g2.fillArc(xPos,yPos, pieSize, pieSize, -startAngle,(int)-(curVal+(360.0-anglerr)));
else
g2.fillArc(xPos,yPos, pieSize, pieSize, -startAngle,(int)-curVal);
tic(g2,Math.round(((values[i]/sum)*10000))/100 + "%",
(int)(startAngle+(curVal/2)),
xPos+pieSize/2,
yPos+pieSize/2,
pieSize/2,
pieSize/2);
g2.setFont(legendFont);
g2.setColor(c[i%c.length]);
g2.fillOval(sx-legendFontHeight/2,sy-legendFontHeight/2,legendFontHeight/2+1,legendFontHeight/2+1);
g2.setColor(legendTextColor);
if((mouseSelAngle > startAngle) && (mouseSelAngle < (startAngle+curVal))) {
g2.drawRect(sx+legendFontHeight-2,sy-g2.getFontMetrics().getAscent(),g2.getFontMetrics().stringWidth(titles[i])+4,g2.getFontMetrics().getHeight());
if(urls[i] != null) {
mouseSelAngle = -1; // deselect in case user backs up to this page
getAppletContext().showDocument(urls[i]);
}
}
if(piecePos(xMousePos,yMousePos) == i)
{
tip = i;
tipAngle = (int)(startAngle+(curVal/2));
}
g2.drawString(titles[i], sx+legendFontHeight, sy);
sy -= g2.getFontMetrics().getHeight()-2;
startAngle += (int)curVal;
}
g2.setFont(titleFont);
g2.setColor(titleTextColor);
g2.drawString(chartTitle,10, g.getFontMetrics().getHeight()+2);
if((wantTips == true) && inCircle(xMousePos,yMousePos) && (tipAngle != -1) && (tip != -1))
{
drawValue(g2,"" + values[tip],
tipAngle,
xPos+pieSize/2,
yPos+pieSize/2,
pieSize/2,
pieSize/2);
}
g.drawImage(offScreenImage, 0, 0, this);
}
private void drawValue(Graphics g,String value,int i,int x, int y,int w,int h) {
double x1,y1;
x1 = Math.cos((double)i*(Math.PI/180))*(w/3*2);
y1 = Math.sin((double)i*(Math.PI/180))*(h/3*2);
g.setFont(pieFont);
g.setColor(new Color(255,255,128));
g.fillRect((int)x1+x-(g.getFontMetrics().stringWidth(value)/2)-4,(int)y1+y-g.getFontMetrics().getHeight(),g.getFontMetrics().stringWidth(value)+8,g.getFontMetrics().getHeight()+4);
g.setColor(Color.black);
g.drawRect((int)x1+x-(g.getFontMetrics().stringWidth(value)/2)-4,(int)y1+y-g.getFontMetrics().getHeight(),g.getFontMetrics().stringWidth(value)+8,g.getFontMetrics().getHeight()+4);
g.drawString(commaFormat(value),(int)x1+x-(g.getFontMetrics().stringWidth(value)/2),(int)y1+y);
}
private String commaFormat(String s)
{
StringBuffer buf = new StringBuffer();
int i = s.length()-1;
int dot = -1;
int digits = 1;
if(s.indexOf('e') != -1)
return s;
if((dot = s.indexOf('.')) != -1)
{
for(;i>=dot;i--)
buf.insert(0,s.charAt(i));
}
for(;i>=0;i--)
{
buf.insert(0,s.charAt(i));
if( ((digits%3) == 0) && (i>0))
{
buf.insert(0,',');
}
digits++;
}
return buf.toString();
}
private int piecePos(int x,int y)
{
double curVal;
int startAngle = 0;
int curAngle = xyToAngle(x,y);
for(int i=0;i<valuesSize;i++)
{
curVal = values[i]*factor;
if((curAngle > startAngle) && (curAngle < (startAngle+curVal))) {
return(i);
}
startAngle += (int)curVal;
}
return -1;
}
public boolean mouseMove(Event evt, int x, int y)
{
xMousePos = x;
yMousePos = y;
int piece;
if(inCircle(x,y))
{
if(parentFrame != null)
parentFrame.setCursor(Frame.HAND_CURSOR);
if((piece = piecePos(x,y)) != -1)
{
if(urls[piece] != null)
{
showStatus(urls[piece].toString());
} else
{
showStatus(titles[piece]);
}
}
if(piece != curPiece)
{
curPiece = piece;
repaint();
}
} else
{
if(parentFrame != null)
parentFrame.setCursor(Frame.DEFAULT_CURSOR);
if(curPiece != -1)
{
curPiece = -1;
repaint();
}
showStatus("Select a pie piece");
}
return true;
}
public boolean mouseExit(Event evt, int x,int y)
{
showStatus("");
xMousePos = -1;
yMousePos = -1;
return true;
}
public boolean mouseUp(Event evt, int x, int y)
{
if(inCircle(x,y)) {
mouseSelAngle = xyToAngle(x,y);
} else {
mouseSelAngle = -1;
if(URLoutside != null)
getAppletContext().showDocument(URLoutside);
}
repaint();
return true;
}
private int xyToAngle(int x,int y)
{
double radius = pieSize/2;
double t = Math.atan2(y-(yPos+radius),x-(xPos+radius))/(Math.PI/180);
if(t < 0)
{
t = 180+(180-Math.abs(t));
}
return new Double(t).intValue();
}
private boolean inCircle(int xIn,int yIn)
{
double a = pieSize / 2;
double b = pieSize / 2;
double x = xIn - xPos - a;
double y = yIn - yPos - b;
return (((x * x) / (a * a) + (y * y) / (b * b)) <= 1);
}
private void tic(Graphics g,String ticmsg,int i,int x,int y, int w,int h) {
double x1,y1,x2,y2;
x1 = Math.cos((double)i*(Math.PI/180))*w;
y1 = Math.sin((double)i*(Math.PI/180))*h;
x2 = Math.cos((double)i*(Math.PI/180))*(w+10);
y2 = Math.sin((double)i*(Math.PI/180))*(h+10);
g.setColor(pieTextColor);
g.setFont(pieFont);
g.drawLine((int)x1+x,(int)y1+y,(int)x2+x,(int)y2+y);
if(x2 > x1)
g.drawString(ticmsg,(int)x2+x,(int)(y2>y1 ? g.getFontMetrics().getHeight() +y2+y : y2+y));
else
g.drawString(ticmsg,(int)x2+x-g.getFontMetrics().stringWidth(ticmsg),(int)(y2>y1 ? g.getFontMetrics().getHeight() +y2+y : y2+y));
}
Dimension getImageDimensions(Image im)
{
return new Dimension(im.getWidth(this),im.getHeight(this));
}
private Color convertColor(String c)
{
if(c.equalsIgnoreCase("black"))
return Color.black;
if(c.equalsIgnoreCase("blue"))
return Color.blue;
if(c.equalsIgnoreCase("cyan"))
return Color.cyan;
if(c.equalsIgnoreCase("darkGray"))
return Color.darkGray;
if(c.equalsIgnoreCase("gray"))
return Color.gray;
if(c.equalsIgnoreCase("green"))
return Color.green;
if(c.equalsIgnoreCase("lightGray"))
return Color.lightGray;
if(c.equalsIgnoreCase("magenta"))
return Color.magenta;
if(c.equalsIgnoreCase("orange"))
return Color.orange;
if(c.equalsIgnoreCase("pink"))
return Color.pink;
if(c.equalsIgnoreCase("red"))
return Color.red;
if(c.equalsIgnoreCase("white"))
return Color.white;
if(c.equalsIgnoreCase("yellow"))
return Color.yellow;
return Color.black;
}
}
（作者： 1999年12月28日 11:34）
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