Android Matrix画布Canvas旋转Rotate，Kotlin

    private fun f1() {
        val originBmp = BitmapFactory.decodeResource(resources, R.mipmap.pic).copy(Bitmap.Config.ARGB_8888, true)

        val newBmp = Bitmap.createBitmap(originBmp.width, originBmp.height, Bitmap.Config.ARGB_8888)
        val canvas = Canvas(newBmp)

        val matrix = Matrix()
        canvas.concat(matrix)
        matrix.setRotate(20f) //默认左上角（0,0）为旋转点

        //把原图绘制在画布Canvas上
        canvas.drawBitmap(originBmp, matrix, null)

        val paint = Paint(Paint.ANTI_ALIAS_FLAG)
        paint.color = Color.RED
        paint.textSize = 60f
        paint.style = Paint.Style.FILL
        paint.textAlign = Paint.Align.LEFT

        val x = 20f
        val y = 100f
        canvas.drawText("fly", x, y, paint)

        iv1?.setImageBitmap(newBmp)
    }

    private fun f2() {
        val originBmp = BitmapFactory.decodeResource(resources, R.mipmap.pic).copy(Bitmap.Config.ARGB_8888, true)

        val newBmp = Bitmap.createBitmap(originBmp.width, originBmp.height, Bitmap.Config.ARGB_8888)
        val canvas = Canvas(newBmp)

        val matrix = Matrix()
        canvas.concat(matrix)
        //围绕图片中心旋转
        matrix.setRotate(20f, (originBmp.width / 2).toFloat(), (originBmp.height / 2).toFloat())

        //把原图绘制在画布Canvas上
        canvas.drawBitmap(originBmp, matrix, null)

        val paint = Paint(Paint.ANTI_ALIAS_FLAG)
        paint.color = Color.RED
        paint.textSize = 60f
        paint.style = Paint.Style.FILL
        paint.textAlign = Paint.Align.LEFT

        val x = 20f
        val y = 100f

        canvas.drawText("fly", x, y, paint)

        iv2?.setImageBitmap(newBmp)
    }

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