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开发学院软件开发Java LWUIT + ChartComponent 之一实现饼图(PieChart) 阅读

LWUIT + ChartComponent 之一实现饼图(PieChart)

 2009-09-12 00:00:00 来源:WEB开发网   
核心提示: 其次,编写PieChartDemo的代码,LWUIT + ChartComponent 之一实现饼图(PieChart)(2),代码有详细的注释,非常好理解:/**LWUIT+ChartComponent,FlowLayout最适合}privatevoidinitChartInfo(String

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();
        }
    }
}

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Tags:LWUIT ChartComponent 之一

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