Canvas 提供了 skew() 方法用于倾斜当前 Canvas 对象一定角度

skew ( 倾斜 )

skew(float sx, float sy)

倾斜一定的角度

参数说明

两个参数都是 tan 值，比如要在 x 轴方向上倾斜 60 度，那么 sx 为

tan(60) = 根号3 = 1.732

范例

1. 创建一个 空的 Android 项目 cn.twle.android.CanvasSkew

2. 自定义一个 View 类 MsView.java

   package cn.twle.android.canvasskew;
   
   import android.content.Context;
   import android.graphics.Canvas;
   import android.graphics.Paint;
   import android.support.v7.widget.AppCompatImageView;
   
   public class MsView extends AppCompatImageView {
   
       public MsView(Context context) {
   
           super(context, null);
       }
   
       @Override
       protected void onDraw(Canvas canvas) {
   
           super.onDraw(canvas);
   
           Paint mPaint = new Paint();
   
           mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
           mPaint.setAntiAlias(true);// 抗锯尺
           mPaint.setColor(0xffff0000);
           mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
           mPaint.setTextSize(48.0f);
   
           canvas.drawText("简单教程，简单编程",0,200,mPaint);
           canvas.translate(200, 200);
           canvas.skew(0.2f,-0.8f);
           canvas.drawText("简单教程，简单编程",0,200,mPaint);
           invalidate();
       }
   }
   

3. 修改 MainActivity.java 设置 setContentView(new MsView(MainActivity.this))

   package cn.twle.android.canvasskew;
   
   import android.support.v7.app.AppCompatActivity;
   import android.os.Bundle;
   
   public class MainActivity extends AppCompatActivity {
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(new MsView(MainActivity.this));
       }
   }