LWUIT + ChartComponent 之一实现饼图(PieChart)
2009-09-12 00:00:00 来源:WEB开发网其次,编写PieChartDemo的代码,代码有详细的注释,非常好理解:
/*
* LWUIT + ChartComponent,实现多种图表
* 作者:张国威(咪当俺系噜噜)
* 本例实现的是“饼图”
*/
package com.sun.lwuit.uidemo;
import com.sun.lwuit.Button;
import com.sun.lwuit.Command;
import com.sun.lwuit.Font;
import com.sun.lwuit.Form;
import com.sun.lwuit.Image;
import com.sun.lwuit.Label;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.layouts.FlowLayout;
import org.beanizer.j2me.charts.ChartItem;
import org.beanizer.j2me.charts.PieChart;
public class PieChartDemo implements ActionListener {
public Form form = new Form("VBarChartDemo");
private Command backCommand = new Command("Back", 1);
final PieChart pieChart= new PieChart("");
PieChartDemo()
{
//饼图说明
String chart_str[]={"█ A:你好吗","█ B:早上好","█ C:中午好","█ D:晚上好","█ E:吃宵夜","█ F:睡懒觉"};
//饼图颜色
int [][]color={{0,0,200},{0,200,0},{50,15,30},{100,0,200},{0,200,100},{200,100,200}};
//饼图范围
int []percent={15,10,5,20,34,16};
//绘制柱体的说明
initChartInfo(chart_str,color);
int width=form.getWidth();
int height=form.getHeight()-60;
Image img_hbarChart=drawPieChart(pieChart,width,height,"",color,percent);//绘制柱体图
Button button = new Button(img_hbarChart);
button.getStyle().setBgTransparency(1);//透明背景,会非常消耗资源,速度减慢,注意使用
button.setBorderPainted(false);
form.addComponent(button);
form.addCommand(backCommand);
form.setCommandListener(this);
form.setLayout(new FlowLayout());//必须使用这种排列,FlowLayout最适合
}
private void initChartInfo(String []chart_str,int [][]color)
{
for(int i=0;i<chart_str.length;i++)//循环
{
Label chart_info = new Label(chart_str[i]);
chart_info.getStyle().setFgColor(UIDemoMIDlet.RGBtoInt(color[i][0],color[i][1],color[i][2]));
form.addComponent(chart_info);
}
}
private Image drawPieChart(ChartItem item,
int width,
int height,
String imagefile,
int [][]color,//柱体颜色
int []percent)//柱体长度(百分比)
{
item.setFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_SMALL);
item.setDrawAxis(true);
item.setPreferredSize(width-80,width-80);//设置chart控件的大小,饼图必须width=height
if(imagefile.length()>0)//需要使用背景时
{
try{
javax.microedition.lcdui.Image img=javax.microedition.lcdui.Image.createImage(imagefile);//读取背景图
item.setBackgroundImage(img);//设置背景图
} catch(Exception ex){ex.printStackTrace();}
}
item.showShadow(true);//使用阴影特效
item.setShadowColor(20,20,20);//设置阴影颜色
item.setColor(40, 40, 200);
item.resetData();
for(int i=0;i<color.length;i++)//循环绘画柱体
{
item.addElement(String.valueOf((char)('a'+i)),percent[i],color[i][0],color[i][1],color[i][2]);
}
item.setMaxValue(100);//柱体代表数值的显示范围,100%
//这个是lcdui的Image
javax.microedition.lcdui.Image lcdui_img=
javax.microedition.lcdui.Image.createImage(width,height);//饼图大小,图像>控件
//这个是lcdui的Graphics
javax.microedition.lcdui.Graphics lcdui_g= lcdui_img.getGraphics();
pieChart.drawPie(lcdui_g,
40,//x
40,//y
width-100,//宽
width-100);//长,这里设置的大小必须比width,height小,才能完全显示
return UIDemoMIDlet.lcdui2lwuit(lcdui_img);
}
public void actionPerformed(ActionEvent arg0) {
if(arg0.getCommand()==backCommand)
{
UIDemoMIDlet.backToMainMenu();
}
}
}
Tags:LWUIT ChartComponent 之一
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