自定义控件之绘图篇（二）：路径及文字 一目了然 ，适合初学者

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package nsuperseller.grasp.com.my_paint.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.View;

/**
 * Created by Administrator on 2016/9/2.
 */
public class MyViewPath extends View {
    Context m_context;

    public MyViewPath(Context context) {
        super(context);
        m_context = context;
    }

    //重写OnDraw（）函数，在每次重绘时自主实现绘图
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // paintRect(canvas);//画圆
        //  paintRoundRect(canvas);//
        //paintRound(canvas);//圆形路径
//        paintOval(canvas);//椭圆
//       paintAngle(canvas);//弧
        setPaint(canvas);
    }

    /*画三角形-----1、直线路径*/
    private void paintSanjiao(Canvas canvas) {
        //设置画笔基本属性
        Paint paint = new Paint();
        paint.setAntiAlias(true);//抗锯齿功能
        paint.setColor(Color.RED);//设置画笔的颜色
        paint.setStyle(Paint.Style.STROKE);//设置填充的样式
        paint.setStrokeWidth(5);//设置画笔的宽度

        Path path = new Path();
        path.moveTo(10, 10);//设置起始点
        path.lineTo(10, 100);//第一条直线的终点，也是第二条直线的起点
        path.lineTo(300, 100);//画第二条直线
        //  path.lineTo(500,100);//画第三条直线
        path.close();
        canvas.drawPath(path, paint);
    }

    /*矩形路径  依据路径写出文字*/
    private void paintRect(Canvas canvas) {
        //设置画笔基本属性
        Paint paint = new Paint();
        paint.setAntiAlias(true);//抗锯齿功能
        paint.setColor(Color.RED);//设置画笔的颜色
        paint.setStyle(Paint.Style.STROKE);//设置填充的样式
        paint.setStrokeWidth(5);//设置画笔的宽度
        //先创建两个大小一样的矩阵
        //第一个逆向生成   Path.Direction.CCW
        Path path1 = new Path();
        RectF rectF1 = new RectF(50, 50, 240, 200);
        path1.addRect(rectF1, Path.Direction.CCW);
        //第二个顺时生成
        Path path2 = new Path();
        RectF rectF2 = new RectF(290, 50, 480, 200);
        path2.addRect(rectF2, Path.Direction.CW);
        //先画出这两个路径
        canvas.drawPath(path1, paint);
        canvas.drawPath(path2, paint);

        //依据路径写出文字
        String text = "我爱我自己，我爱我生命！我是最棒的！";
        paint.setColor(Color.GREEN);
        paint.setTextSize(20);
        canvas.drawTextOnPath(text, path1, 8, 10, paint);
        canvas.drawTextOnPath(text, path2, 0, 18, paint);
    }

    //圆角矩形路径
    private void paintRoundRect(Canvas canvas) {
        //设置画笔基本属性
        Paint paint = new Paint();
        paint.setAntiAlias(true);//抗锯齿功能
        paint.setColor(Color.RED);//设置画笔的颜色
        paint.setStyle(Paint.Style.STROKE);//设置填充的样式
        paint.setStrokeWidth(5);//设置画笔的宽度

        Path path = new Path();
        RectF rect = new RectF(50, 50, 24, 200);
        path.addRoundRect(rect, 10, 15, Path.Direction.CCW);

        RectF rectF1 = new RectF(290, 50, 480, 200);
        float radii[] = {10, 15, 20, 25, 30, 35, 40, 45};
        path.addRoundRect(rectF1, radii, Path.Direction.CCW);

        canvas.drawPath(path, paint);
    }

    //圆形路径
    private void paintRound(Canvas canvas) {
        //设置画笔基本属性
        Paint paint = new Paint();
        paint.setAntiAlias(true);//抗锯齿
        paint.setStyle(Paint.Style.STROKE);//设置填充的样式
        paint.setColor(Color.RED);//设置画颜色
        paint.setStrokeWidth(5);//设置画笔的宽度
        Path path = new Path();
        path.addCircle(200, 200, 100, Path.Direction.CCW);
        canvas.drawPath(path, paint);
    }

    //椭圆路径
    private void paintOval(Canvas canvas) {
        //设置画笔基本属性
        Paint paint = new Paint();
        paint.setAntiAlias(true);//抗锯齿
        paint.setStyle(Paint.Style.STROKE);//设置填充的样式
        paint.setColor(Color.RED);//设置画颜色
        paint.setStrokeWidth(5);//设置画笔的宽度
        Path path = new Path();
        RectF rect = new RectF(50, 50, 240, 200);
        path.addOval(rect, Path.Direction.CCW);
        canvas.drawPath(path, paint);
    }

    //弧路径
    private void paintAngle(Canvas canvas) {
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(Color.RED);
        paint.setStrokeWidth(5);
        paint.setStyle(Paint.Style.STROKE);

        Path path = new Path();
        RectF rectF = new RectF(50, 50, 240, 200);
        path.addArc(rectF, 0, 200);
        canvas.drawPath(path, paint);
    }

    //线段轨迹
    private void setPaint(Canvas canvas) {
        //普通设置
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setStrokeWidth(5);
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);
        paint.setTextSize(40);
        paint.setTextAlign(Paint.Align.CENTER);

        //样式设置
        paint.setFakeBoldText(true);//粗体
        paint.setUnderlineText(true);//下划线
        paint.setTextSkewX((float) -0.25);//设置字体水平倾斜度，普通斜体字是-0.25
        paint.setStrikeThruText(true);//设置带有删除线效果

        //其他设置
        paint.setTextScaleX(2);

        canvas.drawText("我爱我自己，我爱我生命！我是最棒的！", 10, 300, paint);
    }
}