技術標籤：androidandroid

import android.content.Context
import android.graphics.*

import com.bumptech.glide.load.Key

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool

import com.bumptech.glide.load.resource.bitmap.BitmapTransformation

import java.security.MessageDigest

/**
 * glide 4.9.0 載入圓角圖片，支援不同角有不同的半徑哦！
 *  Glide.with(this).load(url).apply(
RequestOptions.bitmapTransform(RoundCorner(this,4.0f,12.0f,12.0f,4.0f)))
.into(imgCover)
 參考 https://www.sohu.com/a/240001388_465908
 */
class RoundCorner(context: Context, leftTop: Float= 0f, rightTop: Float= 0f, rightBottom: Float= 0f,leftBottom: Float= 0f) : BitmapTransformation() {

    private val ID: String = "com.jadynai.kotlindiary.RoundCorner$leftTop$rightTop$leftBottom$rightBottom"

    private val leftTop: Float= dip2px(context,leftTop).toFloat()

    private val rightTop =dip2px(context,rightTop).toFloat()

    private val leftBottom = dip2px(context,leftBottom).toFloat()

    private val rightBottom = dip2px(context,rightBottom).toFloat()

    private val ID_BYTES: ByteArray//dp轉px

    fun dip2px(var0: Context, var1: Float): Int{

        val var2 = var0.resources.displayMetrics.density

        return(var1 * var2 + 0.5f).toInt()
    }

    init {

        ID_BYTES = ID.toByteArray(Key.CHARSET)

    }

    override fun transform(pool: BitmapPool, toTransform: Bitmap, outWidth: Int, outHeight: Int): Bitmap {

        val width = toTransform.width

        val height = toTransform.height

        val bitmap = pool. get(width, height, Bitmap.Config.ARGB_8888)

        bitmap.setHasAlpha( true)

        val canvas = Canvas(bitmap)

        val paint = Paint()

        paint.isAntiAlias = true

        paint.shader = BitmapShader(toTransform, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)

        val rect = RectF( 0f, 0f, width.toFloat(), height.toFloat())

        val radii = floatArrayOf(leftTop, leftTop, rightTop, rightTop, rightBottom, rightBottom, leftBottom, leftBottom)

        val path = Path()

        path.addRoundRect(rect, radii, Path.Direction.CW)

        canvas.drawPath(path, paint)

        return bitmap

    }
    override fun equals(other: Any?): Boolean{

        if(other is RoundCorner) {

            return leftTop == other?.leftTop && rightTop == other?.rightTop && leftBottom == other?.leftBottom && rightBottom == other?.rightBottom

        }

        return false

    }

    override fun hashCode(): Int{

        return ID.hashCode() + leftTop.hashCode() + rightTop.hashCode() + leftBottom.hashCode() + rightBottom.hashCode()

    }

    override fun updateDiskCacheKey(messageDigest: MessageDigest){
        messageDigest.update(ID_BYTES)
    }

}