Android Matrix画布Canvas缩放scale，Kotlin

灰太狼 2024-02-05 17:11 24阅读 0赞

### Android Matrix画布Canvas缩放scale，Kotlin ###

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.setScale(2f, 2f) //宽高放大2倍。
    
            //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.RED
            paint.textSize = 30f
            paint.style = Paint.Style.FILL
            paint.textAlign = Paint.Align.LEFT
            val x = 20f
            val y = 100f
            canvas.drawText("fly", x, y, paint)
    
            iv1?.setImageBitmap(newBmp)

![c01486d8902e4e70aa29df94829351b2.png][]

[https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/01fa1c0226ec43f685edbb8fcb2f050b.png![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/01fa1c0226ec43f685edbb8fcb2f050b.png][https_zhangphil.blog.csdn.net_article_details_134832517_icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_zhangphil.blog.csdn.net_article_details_134832517]

[Android画布Canvas绘图scale & translate，Kotlin-CSDN博客文章浏览阅读444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_444_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]

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[https_zhangphil.blog.csdn.net_article_details_134832517_icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_zhangphil.blog.csdn.net_article_details_134832517]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/01fa1c0226ec43f685edbb8fcb2f050b.png
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[Android_Canvas_scale _ translate_Kotlin-CSDN_444_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