Android如何实现条形对比统计图

package com.xtravel.widget;
 
import java.util.Timer;
import java.util.TimerTask;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
 
/**
 * @name 自定义数据中心旅客分析变化趋势图
 * @Descripation <br>
 *        1、根据用户提供的数据（两组float[]数）智能绘制数据的对比条形图。<br>
 *        2、绘制图表信息：边框、表名、建立二维坐标系、刻度数量、刻度值、单位、网络线、图例、数据系列。<br>
 *        3、其中Y轴的最大刻度值是用户所提供数据中float[]的最大值，分度值是最大刻度值与刻度数目的比。<br>
 *        4、绘制用户数据对比条形图：启动线程，遍历数组值，不断在原图上刷新。<br>
 * @author Freedoman
 * @date 2014-9-17
 * @version 1.0
 */
public class DataCenterCustomBarChart extends View {
 
 // 框架起点坐标、中心坐标、宽高
 private final int FRAME_X = 20;
 private final int FRAME_Y = 20;
 private final int FRAME_WIDTH = 1000;
 private final int FRAME_HEIGHT = 350;
 private final int FRAME_CENTER_X = FRAME_WIDTH / 2 + FRAME_X;
 private final int FRAME_CENTER_Y = FRAME_HEIGHT / 2 + FRAME_Y;
 
 // 二维坐标系原点坐标
 private final int ORIGIN_X = FRAME_X + 100;
 private final int ORIGIN_Y = FRAME_Y + FRAME_HEIGHT - 100;
 
 // XY轴终点坐标
 private final int XAXIS_X = FRAME_X + FRAME_WIDTH - 200;
 private final int XAXIS_Y = ORIGIN_Y;
 private final int YAXIS_X = ORIGIN_X;
 private final int YAXIS_Y = FRAME_Y + 50;
 
 // XY轴刻度数
 private int countX;
 private int countY;
 
 // XY轴分度值、真实数据分度值
 private float intervalX;
 private float intervalY;
 private float intervalPress;
 
 // 单位名称
 private String nameX;
 private String nameY;
 
 // 图表名称
 private String chartTitle;
 
 // 用户数据
 private int[] data1;
 private int[] data2;
 
 private int currentPosition;
 
 /**
 * 用户建立图表
 * 
 * @param context
 * @param chartTitle
 *      表名称
 * @param nameXAxis
 *      X轴单位
 * @param nameYAxis
 *      Y轴单位
 * @param countY
 *      Y轴刻度数目
 * @param thisYearWeekPerson
 *      用户数据
 * @param lastYearWeekPerson
 *      用户数据
 */
 public DataCenterCustomBarChart(Context context, String chartTitle,
  String nameXAxis, String nameYAxis, int countY,
  int[] thisYearWeekPerson, int[] lastYearWeekPerson) {
 super(context);
 this.chartTitle = chartTitle;
 
 // x轴刻度数量以用户数据最大数据为依据,y轴刻度数量由用户来指定
 this.countX = thisYearWeekPerson.length > lastYearWeekPerson.length &#63; thisYearWeekPerson.length
  : lastYearWeekPerson.length;
 this.countY = countY;
 
 this.nameX = nameXAxis;
 this.nameY = nameYAxis;
 this.data1 = thisYearWeekPerson;
 this.data2 = lastYearWeekPerson;
 
 // 计算XY轴分度值 = 轴长/刻度数
 this.intervalX = (XAXIS_X - ORIGIN_X) / countX;
 this.intervalY = (ORIGIN_Y - YAXIS_Y) / countY;
 
 // 计算用户数据分度值 = 用户数据最大值/ 刻度数
 float max1 = findMaxData(thisYearWeekPerson);
 float max2 = findMaxData(lastYearWeekPerson);
 this.intervalPress = (max1 > max2 &#63; max1 : max2) / countY;
 // startDrawDynomicBar();
 }
 
 /**
 * 动态绘制任务
 */
 public void freshDynomicBar() {
 final Timer timer = new Timer();
 TimerTask timerTask = new TimerTask() {
  @Override
  public void run() {
  currentPosition++;
  postInvalidate();
  if (currentPosition == countX) {
   timer.cancel();
  }
  }
 };
 timer.schedule(timerTask, 100, 800);
 }
 
 /**
 * 绘制图表
 */
 @SuppressLint("DrawAllocation")
 public void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 canvas.drawColor(Color.WHITE);
 
 Paint paint = new Paint();
 initAXIS(canvas, paint, chartTitle);
 drawDynamicBar1(canvas, paint, data1);
 drawDynamicBar2(canvas, paint, data2);
 }
 
 /**
 * 初始化图表基本信息<br>
 * 表名、坐标系、刻度数量、刻度值、网络线、图例、数据系列
 * 
 * @param canvas
 */
 private void initAXIS(Canvas canvas, Paint paint, String chartTitle) {
 
 // 画边框
 paint.setColor(Color.GRAY);
 paint.setStyle(Paint.Style.STROKE);
 paint.setStrokeWidth(6);
 canvas.drawRect(FRAME_X, FRAME_Y, FRAME_WIDTH, FRAME_HEIGHT, paint);
 
 // 画坐标轴
 paint.setColor(Color.BLACK);
 paint.setStyle(Paint.Style.STROKE);
 paint.setStrokeWidth(5);
 // X轴及方向箭头
 canvas.drawLine(ORIGIN_X, ORIGIN_Y, XAXIS_X, XAXIS_Y, paint);
 canvas.drawLine(XAXIS_X, XAXIS_Y, XAXIS_X - 10, XAXIS_Y - 10, paint);
 canvas.drawLine(XAXIS_X, XAXIS_Y, XAXIS_X - 10, XAXIS_Y + 10, paint);
 // Y轴及方向箭头
 canvas.drawLine(ORIGIN_X, ORIGIN_Y, YAXIS_X, YAXIS_Y, paint);
 canvas.drawLine(YAXIS_X, YAXIS_Y, YAXIS_X - 10, YAXIS_Y + 10, paint);
 canvas.drawLine(YAXIS_X, YAXIS_Y, YAXIS_X + 10, YAXIS_Y + 10, paint);
 
 // 图表名称(2014年五月第一周)
 paint.setColor(Color.BLACK);
 paint.setStyle(Paint.Style.FILL);
 paint.setTextSize(20);// 设置字体大小
 paint.setStrokeWidth(2);
 canvas.drawText(chartTitle, FRAME_CENTER_X - 100, FRAME_Y + 30, paint);
 
 // 绘制数据系列20*20矩形(今年、去年)
 paint.setColor(Color.CYAN);
 canvas.drawRect(FRAME_WIDTH - 100, FRAME_CENTER_Y - 30,
  FRAME_WIDTH - 70, FRAME_CENTER_Y, paint);
 canvas.drawText("今年", FRAME_WIDTH - 60, FRAME_CENTER_Y, paint);
 
 paint.setColor(Color.MAGENTA);
 canvas.drawRect(FRAME_WIDTH - 100, FRAME_CENTER_Y, FRAME_WIDTH - 70,
  FRAME_CENTER_Y + 30, paint);
 canvas.drawText("去年", FRAME_WIDTH - 60, FRAME_CENTER_Y + 30, paint);
 
 // 画网格线
 paint.setColor(Color.GRAY);
 paint.setStyle(Paint.Style.STROKE);
 paint.setStrokeWidth(2);
 
 // 横线(从x轴依次向上画)
 for (int i = 0; i <= countY; i++) {
  canvas.drawLine(ORIGIN_X, ORIGIN_Y - i * intervalY, XAXIS_X,
   ORIGIN_Y - i * intervalY, paint);
 }
 
 // 竖线(从y轴依次向右画)
 for (int i = 0; i <= countX; i++) {
  canvas.drawLine(ORIGIN_X + i * intervalX, ORIGIN_Y, ORIGIN_X + i
   * intervalX, YAXIS_Y, paint);
 }
 
 // X轴刻度值(沿X轴方向1、2、3...),轴名称
 paint.setColor(Color.BLUE);
 paint.setStyle(Paint.Style.FILL);
 paint.setStrokeWidth(2);
 paint.setTextSize(30);
 for (int i = 0; i <= countX; i++) {
  canvas.drawText("" + i, ORIGIN_X + i * intervalX, ORIGIN_Y + 50,
   paint);
 }
 
 paint.setTextSize(20);
 // Y轴刻度值(沿Y轴方向，用户提供的数据)轴名称
 for (int i = 1; i <= countY; i++) {
  canvas.drawText("" + (int) (i * intervalPress), ORIGIN_X - 80,
   ORIGIN_Y - i * intervalY + 5, paint);
 }
 
 paint.setTextSize(20);
 canvas.drawText("(" + nameX + ")", XAXIS_X + 40, XAXIS_Y + 50, paint);
 canvas.drawText("(" + nameY + ")", YAXIS_X - 30, YAXIS_Y - 20, paint);
 }
 
 /**
 * 绘制data1变化趋势线 <br>
 */
 @SuppressLint("ResourceAsColor")
 private void drawDynamicBar1(Canvas canvas, Paint paint, int[] data) {
 float curRectX_data1 = ORIGIN_X + intervalX - 30;
 float curRectY_data1;
 for (int i = 1; i < currentPosition; i++, curRectX_data1 += intervalX) {
  // 绘制data1的动态条形
  paint.setColor(Color.CYAN);
  curRectY_data1 = data[i - 1] / intervalPress * intervalY;
  canvas.drawRect(curRectX_data1, ORIGIN_Y - curRectY_data1,
   curRectX_data1 + 30, ORIGIN_Y, paint);
 }
 }
 
 /**
 * 绘制data2变化趋势线
 */
 @SuppressLint("ResourceAsColor")
 private void drawDynamicBar2(Canvas canvas, Paint paint, int[] data) {
 float curRectX_data2 = ORIGIN_X + intervalX;
 float curRectY_data2;
 for (int i = 1; i < currentPosition; i++, curRectX_data2 += intervalX) {
  // 绘制data2的动态条形
  paint.setColor(Color.MAGENTA);
  curRectY_data2 = data[i - 1] / intervalPress * intervalY;
  canvas.drawRect(curRectX_data2, ORIGIN_Y - curRectY_data2,
   curRectX_data2 + 30, ORIGIN_Y, paint);
 }
 }
 
 /**
 * 查找数组的最大值
 * 
 * @param data
 * @return float
 */
 private int findMaxData(int[] data) {
 int max = data[0];
 for (int i = 1; i < data.length; i++) {
  if (data[i] > max) {
  max = data[i];
  }
 }
 return max;
 }
 
 /**
 * 计算今年游客数相对去年的增长率
 * 
 * @return float 增长率百分数
 */
 public float getGrowthRate() {
 float sumYear = 0, sumLastYear = 0;
 for (int i = 0; i < data1.length; i++) {
  sumYear += data1[i];
  sumLastYear += data2[i];
 }
 return (sumYear - sumLastYear) / sumLastYear * 100;
 }
 
 /**
 * 统计一周总人数
 * 
 * @return int 人数
 */
 public int getSumWeek() {
 int sum = 0;
 for (int i = 0; i < data1.length; i++) {
  sum += data1[i];
 }
 return sum;
 }
 
 /**
 * 统计一周平均每天旅客数量
 * 
 * @return int
 */
 public int getAverageWeek() {
 return getSumWeek() / data1.length;
 }
}