Android画布Canvas绘图scale & translate，Kotlin

曾经终败给现在 2024-02-05 14:16 15阅读 0赞

### Android画布Canvas绘图scale & translate，Kotlin ###

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![13cc497051ac4dc58596ebf28f4c0931.png][]

<?xml version="1.0" encoding="utf-8"?>
    <androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/darker_gray"
        android:orientation="vertical"
        app:divider="@android:drawable/divider_horizontal_bright"
        app:dividerPadding="5dp"
        app:showDividers="beginning|middle|end">
    
        <ImageView
            android:id="@+id/iv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_margin="10dp"
            android:background="@drawable/ic_launcher_background"
            android:scaleType="fitCenter"
            android:src="@mipmap/pic" />
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
    
            <ImageView
                android:id="@+id/iv1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:background="@drawable/ic_launcher_background" />
    
            <ImageView
                android:id="@+id/iv2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:background="@drawable/ic_launcher_background" />
    
    
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
    
            <ImageView
                android:id="@+id/iv3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:background="@drawable/ic_launcher_background" />
    
            <ImageView
                android:id="@+id/iv4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:background="@drawable/ic_launcher_background" />
    
        </LinearLayout>
    </androidx.appcompat.widget.LinearLayoutCompat>

import android.graphics.Bitmap
    import android.graphics.Canvas
    import android.graphics.drawable.BitmapDrawable
    import android.os.Bundle
    import android.widget.ImageView
    import androidx.appcompat.app.AppCompatActivity
    import androidx.lifecycle.lifecycleScope
    import kotlinx.coroutines.Dispatchers
    import kotlinx.coroutines.delay
    import kotlinx.coroutines.launch
    
    
    class MainActivity : AppCompatActivity() {
        private var iv: ImageView? = null
        private var iv1: ImageView? = null
        private var iv2: ImageView? = null
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
    
            iv = findViewById(R.id.iv)
    
            iv1 = findViewById(R.id.iv1)
            iv2 = findViewById(R.id.iv2)
    
            lifecycleScope.launch(Dispatchers.Main) {
                delay(500)
    
                f1()
                f2()
            }
        }
    
        private fun f1() {
            val bitmap = ((iv?.drawable as BitmapDrawable).bitmap.copy(Bitmap.Config.ARGB_8888, true))
            val canvas = Canvas(bitmap)
    
            val left = 50f
            val top = 200f
    
            canvas.scale(0.5f, 0.3f)
            canvas.translate(left, top)
            canvas.drawBitmap(bitmap, left, top, null)
    
            iv1?.setImageBitmap(bitmap)
        }
    
        private fun f2() {
            val bitmap = ((iv?.drawable as BitmapDrawable).bitmap.copy(Bitmap.Config.ARGB_8888, true))
            val canvas = Canvas(bitmap)
    
            val left = 50f
            val top = 200f
    
            canvas.scale(0.8f, 0.2f)
            canvas.translate(left, top)
            canvas.drawBitmap(bitmap, left, top, null)
    
            iv2?.setImageBitmap(bitmap)
        }
    }

[Android画布Canvas绘图scale，Kotlin-CSDN博客文章浏览阅读237次，点赞2次，收藏2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/134832517][Android_Canvas_scale_Kotlin-CSDN_237_2_2_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_134832517]

[13cc497051ac4dc58596ebf28f4c0931.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/54452ed3c0ac4b7180cbd164008632ea.png
[favicon32.ico]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/b8bf513486bc4d5184f79a1b69321e3e.png
[Android_Canvas_scale_Kotlin-CSDN_237_2_2_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_134832517]: https://blog.csdn.net/zhangphil/article/details/134832517