Android Canvas状态save与restore，Kotlin

迈不过友情╰ 2024-02-05 17:11 41阅读 0赞

### Android Canvas状态save与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)
        }

![6bf4ebcdca624982b67c0842f055527d.png][]

[Android画布Canvas绘图scale & translate，Kotlin-CSDN博客文章浏览阅读440次，点赞4次，收藏11次。文章浏览阅读9.6k次。文章浏览阅读1.8k次。/\*Java代码 将Drawable转化为Bitmap \*/ Bitmap drawableToBitmap(Drawable drawable) \{ int width = drawable.getIntrinsicWidth();Android Material Design ：LinearLayoutCompat添加分割线divider\_linearlayout 分割线-CSDN博客。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/134930229][Android_Canvas_scale _ translate_Kotlin-CSDN_440_4_11_9.6k_1.8k_Java_ _Drawable_Bitmap _ Bitmap drawableToBitmap_Drawable drawable_ _ int width _ drawable.getIntrinsicWidth_Android Material Design _LinearLayoutCompat_divider_linearlayout _-CSDN_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_134930229]

[6bf4ebcdca624982b67c0842f055527d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/8dc4545fb45744049f8466bd80b1c87e.png
[favicon32.ico]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/2d147ffb4cf04a139130033b536a7c3b.png
[Android_Canvas_scale _ translate_Kotlin-CSDN_440_4_11_9.6k_1.8k_Java_ _Drawable_Bitmap _ Bitmap drawableToBitmap_Drawable drawable_ _ int width _ drawable.getIntrinsicWidth_Android Material Design _LinearLayoutCompat_divider_linearlayout _-CSDN_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_134930229]: https://blog.csdn.net/zhangphil/article/details/134930229