add BitmapShader

Author: solygambas

24-findme/app/src/main/java/com/hfad/findme/SpotlightImageView.kt

@@ -0,0 +1,58 @@
+package com.hfad.findme
+
+import android.content.Context
+import android.graphics.*
+import android.util.AttributeSet
+import androidx.appcompat.widget.AppCompatImageView
+
+class SpotlightImageView @JvmOverloads constructor(
+    context: Context, attrs: AttributeSet? = null
+) : AppCompatImageView(context, attrs) {
+    private var paint = Paint()
+    private var shouldDrawSpotlight = false
+    private var gameOver = false
+
+    private lateinit var winnerRect: RectF
+    private var androidBitmapX = 0f
+    private var androidBitmapY = 0f
+
+    private val bitmapAndroid = BitmapFactory.decodeResource(
+        resources,
+        R.drawable.android
+    )
+    private val spotlight = BitmapFactory.decodeResource(resources, R.drawable.mask)
+
+    private var shader: Shader
+//    private val shaderMatrix = Matrix()
+
+    init {
+        val bitmap = Bitmap.createBitmap(spotlight.width, spotlight.height, Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(bitmap)
+        val shaderPaint = Paint(Paint.ANTI_ALIAS_FLAG)
+        // Draw a black rectangle
+        shaderPaint.color = Color.BLACK
+        canvas.drawRect(0.0f, 0.0f, spotlight.width.toFloat(), spotlight.height.toFloat(), shaderPaint)
+        // Mask out the spotlight
+        shaderPaint.xfermode = PorterDuffXfermode(PorterDuff.Mode.DST_OUT)
+        canvas.drawBitmap(spotlight, 0.0f, 0.0f, shaderPaint)
+        // Create the shader
+        // You can also use LinearGradient, RadialGradient, SweepGradient and ComposeShader
+        // The other tiling modes are REPEAT and MIRROR
+        shader = BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
+//        shader = BitmapShader(bitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT)
+        paint.shader = shader
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        // Draw the BitmapShader texture
+/*        canvas.drawColor(Color.YELLOW)
+//        canvas.drawRect(0.0f, 0.0f, spotlight.width.toFloat(), spotlight.height.toFloat(), paint)
+        shaderMatrix.setTranslate(
+            100f,
+            550f
+        )
+        shader.setLocalMatrix(shaderMatrix)
+        canvas.drawRect(0.0f, 0.0f, width.toFloat(), height.toFloat() / 2, paint)*/
+    }
+}

24-findme/app/src/main/res/layout/activity_main.xml

@@ -6,13 +6,13 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
+    <com.hfad.findme.SpotlightImageView
+        android:id="@+id/spotlightImageView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>