Android画布Canvas裁剪clipRect，Kotlin

Android画布Canvas裁剪clipRect，Kotlin  

 

private fun mydraw() { 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) //把原图绘制在画布Canvas canvas.drawBitmap(originBmp, 0f, 0f, null) val paint = Paint(Paint.ANTI_ALIAS_FLAG) paint.color = Color.BLUE paint.style = Paint.Style.STROKE paint.strokeWidth = 30f val centerX = originBmp.width / 2 val centerY = originBmp.height / 2 val w = 300 val h = 200 val rect = Rect(centerX - w / 2, centerY - h / 2, centerX + w / 2, centerY + h / 2) canvas.clipRect(rect) //选（裁剪）出一块中心区域。 iv1?.setImageURI(Uri.fromFile(saveBitmapToFile(newBmp))) canvas.drawColor(Color.RED) //在这块中心区域绘制颜色。 iv2?.setImageURI(Uri.fromFile(saveBitmapToFile(newBmp))) canvas.drawRect(rect, paint) //在这块中心区域边框绘制线。 iv3?.setImageURI(Uri.fromFile(saveBitmapToFile(newBmp))) } private fun saveBitmapToFile(bm: Bitmap): File? { var saveFile: File? = null val savePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString() if (!Files.exists(Paths.get(savePath))) { Log.d("保存文件", "${savePath}不存在!") } else { saveFile = File(savePath, System.currentTimeMillis().toString() + ".jpeg") try { val saveImgOut = FileOutputStream(saveFile) //压缩 bm press(Bitmap.CompressFormat.JPEG, 90, saveImgOut) saveImgOut.flush() saveImgOut.close() Log.d("保存文件", "Bitmap保存至 ${saveFile.absoluteFile.toPath()}") } catch (e: Exception) { e.printStackTrace() } } return saveFile }

 

 

 

 

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