struts开发实践—柱形图实例

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struts开发实践-柱形图、饼状图实例

本案主要功能是完成柱形图、饼状图的绘制，并将柱形图、饼状图生成jpg图形并显示。

1。调用的主要函数说明:请参考曲线图部分的说明

2。曲线图绘制文件

/*****************program CurveFrame begin************************/

package test;

import java.awt.*;

import java.awt.geom.*;

import java.awt.image.*;

import javax.swing.JFrame;

import java.lang.Math;

/**

* 绘图：柱形图；饼形图

*/

public class StatRectFrame

extends JFrame {

private int[] result;

private String[] title;

private int statStyle;

private Color[] color = {

Color.blue, new Color(255, 92, 0), new Color(255, 0, 30),

new Color(0, 255, 30), new Color(255, 0, 240), Color.cyan};

/**入口参数：结果集，标题集，统计类型：柱状图 or 饼状图 */

public StatRectFrame(int[] result, String[] title, int statStyle) {

this.result = result;

this.title = title;

this.statStyle = statStyle;

}

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D) g;

Dimension dim = this.getSize();

if (statStyle == 1) {//饼状图

g2.setColor(Color.white);

g2.fillRect(0, 0, dim.width, dim.height);

int total = result[result.length - 1];

int begTangle = 0;

int endTangle = 0;

g2.setColor(Color.black);

int pointx=dim.width/2;//圆心x

int pointy=dim.height/2;//圆心y

int r=150;//半径

long[] pointsx=new long[result.length-1];

long[] pointsy=new long[result.length-1];

pointsx[0]=pointx+r;

pointsy[0]=pointy;

for (int i = 1; i < result.length - 1; i++) {

if (i >= 6) {

g2.setColor(color[i % 6]);

}

else {

g2.setColor(color[i]);

}

if (result[i] > 0) {

int percent=Math.round((result[i]*100f)/total);

endTangle = Math.round(percent*360f/100f);

title[i]=title[i]+"("+percent+"%)";

g2.fillArc( pointx-r,pointy-r, 2*r, 2*r,

begTangle, endTangle);

//新中心点

pointsx[i]=Math.round(Math.cos(Math.toRadians(begTangle+endTangle*0.5))*r+pointx);

pointsy[i]=Math.round(pointy-Math.sin(Math.toRadians(begTangle+endTangle*0.5))*r);

//延长点

long pointsxEx=Math.round(Math.cos(Math.toRadians(begTangle+endTangle*0.5))*(r+50)+pointx);

long pointsyEx=Math.round(pointy-Math.sin(Math.toRadians(begTangle+endTangle*0.5))*(r+50));

g2.setColor(Color.black);

g2.draw(new Line2D.Double(pointsx[i], pointsy[i], pointsxEx, pointsyEx));

//画文本框

g2.setColor(new Color(251,249,206));

if(((int)pointsxEx)<pointx){

g2.fillRect( (int) pointsxEx-110, (int) pointsyEx - 10, 110, 20);

g2.setColor(Color.black);

g2.drawString(title[i],(int)pointsxEx-110,(int)pointsyEx+5);

}

else{

g2.fillRect( (int) pointsxEx, (int) pointsyEx - 10, 110, 20);

g2.setColor(Color.black);

g2.drawString(title[i],(int)pointsxEx,(int)pointsyEx+5);

}

begTangle = begTangle + endTangle;

}

}

}

else {//柱状图

// make sure to fill in the background color

g2.setColor(Color.white);

g2.fillRect(0, 0, dim.width, dim.height);

// draw the x and y axis

g2.setPaint(Color.black);

g2.setStroke(new BasicStroke(2.0f));

g2.draw(new Line2D.Double(10, 10, 10, dim.height - 120));

g2.draw(new Line2D.Double(10, dim.height - 120,

dim.width, dim.height - 120));

//画柱形图

Font font = g2.getFont().deriveFont(12.0f);

g2.setFont(font);

// font.layoutGlyphVector()

int height = Math.round(dim.height - 120 - 30) / result[0];

for (int i = 1; i < result.length - 1; i++) {

g2.setPaint(Color.black);

g2.drawString("" + result[i], 20 + (i - 1) * 30,

dim.height - 120 - height * result[i] - 20);

//draw the title

//print one by one;

for (int j = 1; j <= Math.round(title[i].length() / 2); j++) {

g2.drawString(title[i].substring( (j - 1) * 2, j * 2),

20 + (i - 1) * 30, dim.height - 120 + j * 20);

}

if (i >= 6) {

g2.setColor(color[i % 6]);

}

else {

g2.setColor(color[i]);

}

g2.fillRect(20 + (i - 1) * 30, dim.height - 120 - height * result[i],

20, height * result[i]);

}

}

}

}/*****************program end************************/

3。生成jpg图形并显示：与曲线图中介绍的部分类似，不再赘述。