Android Canvas state save and restore, Kotlin

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