add HandleOverlay

Author: SmartToolFactory

image/src/main/java/com/smarttoolfactory/image/transform/HandleOverlay.kt

@@ -0,0 +1,117 @@
+package com.smarttoolfactory.image.transform
+
+import androidx.compose.animation.core.*
+import androidx.compose.foundation.Canvas
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Rect
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.PathEffect
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.unit.dp
+
+/**
+ * Overlay that draws border and handles over
+ */
+@Composable
+internal fun HandleOverlay(
+    modifier: Modifier,
+    radius: Float,
+    rectDraw: Rect,
+    handlePlacement: HandlePlacement = HandlePlacement.Corner
+) {
+
+    val transition: InfiniteTransition = rememberInfiniteTransition()
+
+    // Infinite phase animation for PathEffect
+    val phase by transition.animateFloat(
+        initialValue = 0f,
+        targetValue = 80f,
+        animationSpec = infiniteRepeatable(
+            animation = tween(
+                durationMillis = 500,
+                easing = LinearEasing
+            ),
+            repeatMode = RepeatMode.Restart
+        )
+    )
+
+    val pathEffect = PathEffect.dashPathEffect(
+        intervals = floatArrayOf(20f, 20f),
+        phase = phase
+    )
+
+    // This rect what we get after offsetting inside padding area to draw actual composable
+    val rect = Rect(
+        topLeft = Offset(
+            rectDraw.topLeft.x + radius,
+            rectDraw.topLeft.y + radius
+        ),
+        bottomRight = Offset(
+            rectDraw.bottomRight.x - radius,
+            rectDraw.bottomRight.y - radius
+        )
+    )
+
+    Canvas(modifier = modifier) {
+
+
+        drawRect(
+            topLeft = rect.topLeft,
+            size = rect.size,
+            color = Color.White,
+            style = Stroke(
+                width = 2.dp.toPx()
+            )
+        )
+        drawRect(
+            topLeft = rect.topLeft,
+            size = rect.size,
+            color = Color.Black,
+            style = Stroke(
+                width = 2.dp.toPx(),
+                pathEffect = pathEffect
+            )
+        )
+
+        if (handlePlacement == HandlePlacement.Corner || handlePlacement == HandlePlacement.Both) {
+            drawBorderCircle(
+                radius = radius,
+                center = rect.topLeft
+            )
+            drawBorderCircle(
+                radius = radius,
+                center = rect.topRight
+            )
+            drawBorderCircle(
+                radius = radius,
+                center = rect.bottomLeft
+            )
+            drawBorderCircle(
+                radius = radius,
+                center = rect.bottomRight
+            )
+        }
+
+        if (handlePlacement == HandlePlacement.Side || handlePlacement == HandlePlacement.Both) {
+            drawBorderCircle(
+                radius = radius,
+                center = rect.centerLeft
+            )
+            drawBorderCircle(
+                radius = radius,
+                center = rect.topCenter
+            )
+            drawBorderCircle(
+                radius = radius,
+                center = rect.centerRight
+            )
+            drawBorderCircle(
+                radius = radius,
+                center = rect.bottomCenter
+            )
+        }
+    }
+}