Android画布Canvas绘图scale & translate，Kotlin

Android画布Canvas绘图scale & translate，Kotlin

 

 

 

 

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。https://blog.csdn.net/zhangphil/article/details/134832517