Android Canvas state save and restore, Kotlin
private fun f1() {
val bitmap = BitmapFactory.decodeResource(resources, R.mipmap.pic).copy(Bitmap.Config.ARGB_8888, true)
val canvas = Canvas(bitmap)
val paint = Paint(Paint.ANTI_ALIAS_FLAG)
paint.color = Color.RED
paint.textSize = 50f
paint.style = Paint.Style.FILL
paint.textAlign = Paint.Align.LEFT
val x = 200f
val y = 200f
canvas.drawText("hello", x, y, paint)
canvas.save() //保存矩阵坐标等画布状态
canvas.rotate(30f, 0f, 0f)
canvas.drawText("world", x, y, paint)
//此处没有canvas.restore(),绘制将紧接着上一笔world绘制。
canvas.drawText("fly", x + 150, y, paint)
iv1?.setImageBitmap(bitmap)
}
private fun f2() {
val bitmap = BitmapFactory.decodeResource(resources, R.mipmap.pic).copy(Bitmap.Config.ARGB_8888, true)
val canvas = Canvas(bitmap)
val paint = Paint(Paint.ANTI_ALIAS_FLAG)
paint.color = Color.RED
paint.textSize = 50f
paint.style = Paint.Style.FILL
paint.textAlign = Paint.Align.LEFT
val x = 200f
val y = 200f
canvas.drawText("hello", x, y, paint)
canvas.save() //保存矩阵坐标等画布状态
canvas.rotate(30f, 0f, 0f)
canvas.drawText("world", x, y, paint)
canvas.restore() //恢复到canvas.save()之前的矩阵坐标等画笔状态,接着hello写。
canvas.drawText("fly", x + 150, y, paint)
iv2?.setImageBitmap(bitmap)
}
Android Canvas drawing scale & translate, Kotlin-CSDN blog article has been viewed 440 times, liked 4 times, and collected 11 times. The article has been viewed and read 9.6k times. The article has been viewed and read 1.8k times. /*Java code converts Drawable to Bitmap */ Bitmap drawableToBitmap(Drawable drawable) { int width = drawable.getIntrinsicWidth();Android Material Design: LinearLayoutCompat adds dividing line divider_linearlayout dividing line - CSDN Blog. https://blog.csdn.net/zhangphil/article/details/134930229