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Android Matrix画布Canvas旋转Rotate，Kotlin

news 2025/9/1 19:50:30

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.REDpaint.textSize = 60fpaint.style = Paint.Style.FILLpaint.textAlign = Paint.Align.LEFTval x = 20fval y = 100fcanvas.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.REDpaint.textSize = 60fpaint.style = Paint.Style.FILLpaint.textAlign = Paint.Align.LEFTval x = 20fval y = 100fcanvas.drawText("fly", x, y, paint)iv2?.setImageBitmap(newBmp)}

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