Android 曲线图绘制
最近項目里要做一個簡單的曲線圖來標識數據，開始以為很簡單，android已經有那么多的開源圖表庫了，什么achartenginee,hellochart，mpandroidchart等等，下載Demo一找，都強大到有點不適合我這個小小的展示功能了，直是無語了。于是只能自已去畫了，繼承自View去重繪。
下面先看一下效果圖：
思路：根據點的數量將Canvas等分，等分后先繪制圖表的所有橫軸和縱軸。再將數據轉化為點坐標，繪制到屏幕上，最后將相鄰兩點連成線即可。
源碼如下：
復制代碼
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Point;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;
/**********************************************************
-
@文件名稱：LineGraphicView.java
-
@文件作者：rzq
-
@創建時間：2015年5月27日 下午3:05:19
-
@文件描述：自定義簡單曲線圖
-
@修改歷史：2015年5月27日創建初始版本
********************************************************/
class LineGraphicView extends View
{
/- 公共部分
*/
private static final int CIRCLE_SIZE = 10;
private static enum Linestyle
{
Line, Curve
}private Context mContext;
private Paint mPaint;
private Resources res;
private DisplayMetrics dm;/**
- data
*/
private Linestyle mStyle = Linestyle.Curve;
private int canvasHeight;
private int canvasWidth;
private int bheight = 0;
private int blwidh;
private boolean isMeasure = true;
/**- Y軸最大值
/
private int maxValue;
/* - Y軸間距值
*/
private int averageValue;
private int marginTop = 20;
private int marginBottom = 40;
/**
- 曲線上總點數
/
private Point[] mPoints;
/* - 縱坐標值
/
private ArrayList yRawData;
/* - 橫坐標值
*/
private ArrayList xRawDatas;
private ArrayList xList = new ArrayList();// 記錄每個x的值
private int spacingHeight;
public LineGraphicView(Context context)
{
this(context, null);
}public LineGraphicView(Context context, AttributeSet attrs)
{
super(context, attrs);
this.mContext = context;
initView();
}private void initView()
{
this.res = mContext.getResources();
this.mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
dm = new DisplayMetrics();
WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
wm.getDefaultDisplay().getMetrics(dm);
}@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
if (isMeasure)
{
this.canvasHeight = getHeight();
this.canvasWidth = getWidth();
if (bheight == 0)
bheight = (int) (canvasHeight - marginBottom);
blwidh = dip2px(30);
isMeasure = false;
}
}@Override
drawAllXLine(canvas);// 畫直線（縱向）drawAllYLine(canvas);// 點的操作設置mPoints = getPoints();mPaint.setColor(res.getColor(R.color.color_ff4631));mPaint.setStrokeWidth(dip2px(2.5f));mPaint.setStyle(Style.STROKE);if (mStyle == Linestyle.Curve){drawScrollLine(canvas);}else{drawLine(canvas);}mPaint.setStyle(Style.FILL);for (int i = 0; i < mPoints.length; i++){canvas.drawCircle(mPoints[i].x, mPoints[i].y, CIRCLE_SIZE / 2, mPaint);}
protected void onDraw(Canvas canvas)
{
mPaint.setColor(res.getColor(R.color.color_f2f2f2));}
/**
- 畫所有橫向表格，包括X軸
*/
private void drawAllXLine(Canvas canvas)
{
for (int i = 0; i < spacingHeight + 1; i++)
{
canvas.drawLine(blwidh, bheight - (bheight / spacingHeight) * i + marginTop, (canvasWidth - blwidh),
bheight - (bheight / spacingHeight) * i + marginTop, mPaint);// Y坐標
drawText(String.valueOf(averageValue * i), blwidh / 2, bheight - (bheight / spacingHeight) * i + marginTop,
canvas);
}
}
/**
- 畫所有縱向表格，包括Y軸
*/
private void drawAllYLine(Canvas canvas)
{
for (int i = 0; i < yRawData.size(); i++)
{
xList.add(blwidh + (canvasWidth - blwidh) / yRawData.size() * i);
canvas.drawLine(blwidh + (canvasWidth - blwidh) / yRawData.size() * i, marginTop, blwidh
+ (canvasWidth - blwidh) / yRawData.size() * i, bheight + marginTop, mPaint);
drawText(xRawDatas.get(i), blwidh + (canvasWidth - blwidh) / yRawData.size() * i, bheight + dip2px(26),
canvas);// X坐標
}
}
private void drawScrollLine(Canvas canvas)
Path path = new Path();path.moveTo(startp.x, startp.y);path.cubicTo(p3.x, p3.y, p4.x, p4.y, endp.x, endp.y);canvas.drawPath(path, mPaint);}
{
Point startp = new Point();
Point endp = new Point();
for (int i = 0; i < mPoints.length - 1; i++)
{
startp = mPoints[i];
endp = mPoints[i + 1];
int wt = (startp.x + endp.x) / 2;
Point p3 = new Point();
Point p4 = new Point();
p3.y = startp.y;
p3.x = wt;
p4.y = endp.y;
p4.x = wt;}
private void drawLine(Canvas canvas)
{
Point startp = new Point();
Point endp = new Point();
for (int i = 0; i < mPoints.length - 1; i++)
{
startp = mPoints[i];
endp = mPoints[i + 1];
canvas.drawLine(startp.x, startp.y, endp.x, endp.y, mPaint);
}
}private void drawText(String text, int x, int y, Canvas canvas)
{
Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
p.setTextSize(dip2px(12));
p.setColor(res.getColor(R.color.color_999999));
p.setTextAlign(Paint.Align.LEFT);
canvas.drawText(text, x, y, p);
}private Point[] getPoints()
points[i] = new Point(xList.get(i), ph + marginTop);}return points;
{
Point[] points = new Point[yRawData.size()];
for (int i = 0; i < yRawData.size(); i++)
{
int ph = bheight - (int) (bheight * (yRawData.get(i) / maxValue));}
public void setData(ArrayList yRawData, ArrayList xRawData, int maxValue, int averageValue)
{
this.maxValue = maxValue;
this.averageValue = averageValue;
this.mPoints = new Point[yRawData.size()];
this.xRawDatas = xRawData;
this.yRawData = yRawData;
this.spacingHeight = maxValue / averageValue;
}public void setTotalvalue(int maxValue)
{
this.maxValue = maxValue;
}public void setPjvalue(int averageValue)
{
this.averageValue = averageValue;
}public void setMargint(int marginTop)
{
this.marginTop = marginTop;
}public void setMarginb(int marginBottom)
{
this.marginBottom = marginBottom;
}public void setMstyle(Linestyle mStyle)
{
this.mStyle = mStyle;
}public void setBheight(int bheight)
{
this.bheight = bheight;
}/**
- 根據手機的分辨率從 dp 的單位 轉成為 px(像素)
*/
private int dip2px(float dpValue)
{
return (int) (dpValue * dm.density + 0.5f);
}
- 公共部分
}
使用：package com.example;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity
{
LineGraphicView tu;
ArrayList yList;
}
復制代碼
demo下載http://note.youdao.com/yws/public/redirect/share?id=fd4b3bc312e39a915fe865c55cfb561a&type=false
Boxing.zip
總結
以上是生活随笔為你收集整理的Android 曲线图绘制的全部內容，希望文章能夠幫你解決所遇到的問題。
- 上一篇： Android 动态绘制曲线等各种图形
- 下一篇： Java中多线程并发处理方式