[置顶] 自定义View之折线图

public class CustomView extends View{

private Paint linePaint;
private Paint linePaint2;
private Paint textPaint;
private Path mPath;
private float textSize=10;

public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// TODO Auto-generated constructor stub
}

public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
linePaint=new Paint();
linePaint2=new Paint();
textPaint=new Paint();
}

public CustomView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
/**
* 0,20,-25,30,0,24,27
* */
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int base_x = (getWidth()-20)/7;
//将y轴分成60份,每份代表1℃,最高温度为60,最低温度为-60
int base_y=(getHeight()/120);
linePaint.setColor(Color.RED);
linePaint.setStyle(Paint.Style.STROKE);
linePaint.setStrokeWidth(1);
linePaint.setAntiAlias(true);
linePaint2.setColor(Color.BLUE);
linePaint2.setStyle(Paint.Style.STROKE);
linePaint2.setStrokeWidth(1);
linePaint2.setAntiAlias(true);
textPaint.setAntiAlias(true);
textPaint.setTextSize(10);
textPaint.setStyle(Style.STROKE);
textPaint.setColor(Color.BLACK);
//画坐标
mPath = new Path();
mPath.moveTo(10, getTop()+10);
mPath.lineTo(10, getBottom()-20);
mPath.lineTo(getRight()-10, getBottom()-20);
//画0°基坐标
Path path=new Path();
path.moveTo(10, getHeight()/2);
path.lineTo(20, getHeight()/2);
canvas.drawPath(path, linePaint);
canvas.drawPath(mPath, linePaint);
//画折线图
Path path2=new Path();
path2.moveTo(base_x, base_y*0+getHeight()/2);
path2.lineTo(base_x*2, base_y*(60-20));
path2.lineTo(base_x*3, base_y*25+getHeight()/2);
path2.lineTo(base_x*4, base_y*30);
path2.lineTo(base_x*5, base_y*0+getHeight()/2);
path2.lineTo(base_x*6, base_y*36);
path2.lineTo(base_x*7, base_y*33);
canvas.drawPath(path2, linePaint2);
canvas.drawText("0", 20+textSize/2, getHeight()/2+textSize/2, textPaint);
canvas.drawText("周一", base_x, getBottom()-textSize/2, textPaint);
canvas.drawText("周二", base_x*2, getBottom()-textSize/2, textPaint);
canvas.drawText("周三", base_x*3, getBottom()-textSize/2, textPaint);
canvas.drawText("周四", base_x*4, getBottom()-textSize/2, textPaint);
canvas.drawText("周五", base_x*5, getBottom()-textSize/2, textPaint);
canvas.drawText("周六", base_x*6, getBottom()-textSize/2, textPaint);
canvas.drawText("周日", (base_x*7), getBottom()-textSize/2, textPaint);
}

}