feat: support complex shapes

- adds shared HexagonShape
- adds shared TrapezoidShape
- adds custom shapes to LineIcon

Related: Traewelling/line-colors#27

Signed-off-by: The one with the braid <[email protected]>

app/src/main/kotlin/de/hbch/traewelling/shared/HexagonShape.kt

@@ -0,0 +1,31 @@
+package de.hbch.traewelling.shared
+
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.Outline
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.graphics.Shape
+import androidx.compose.ui.unit.Density
+
+/**
+ * Forms a hexagon shape with symmetric sides
+ */
+open class HexagonShape(val intent: Float = 0.2f, val peek: Float = 0.5f) : Shape {
+
+
+    override fun createOutline(
+        size: Size,
+        layoutDirection: androidx.compose.ui.unit.LayoutDirection,
+        density: Density
+    ): Outline {
+        val path = Path().apply {
+            moveTo(size.width * intent, 0f)
+            lineTo(size.width * (1 - intent), 0f)
+            lineTo(size.width, size.height * peek)
+            lineTo(size.width * (1 - intent), size.height)
+            lineTo(size.width * intent, size.height)
+            lineTo(0f, size.height * peek)
+            close()
+        }
+        return Outline.Generic(path)
+    }
+}

app/src/main/kotlin/de/hbch/traewelling/shared/TrapezoidShape.kt

@@ -0,0 +1,8 @@
+package de.hbch.traewelling.shared
+
+/**
+ * Forms a trapezoid shape with a broad top and a narrow bottom side
+ */
+open class TrapezoidShape() : HexagonShape(peek = 0f) {
+
+}

app/src/main/kotlin/de/hbch/traewelling/ui/composables/LineIcon.kt

@@ -24,8 +24,10 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.ViewModelStoreOwner
 import androidx.lifecycle.viewmodel.compose.viewModel
 import de.hbch.traewelling.api.models.lineIcons.LineIconShape
+import de.hbch.traewelling.shared.HexagonShape
 import de.hbch.traewelling.shared.LineIcons
 import de.hbch.traewelling.shared.SettingsViewModel
+import de.hbch.traewelling.shared.TrapezoidShape
 import de.hbch.traewelling.theme.LineIconStyle
 import de.hbch.traewelling.theme.LocalFont
 import de.hbch.traewelling.util.getSwitzerlandLineName
@@ -54,8 +56,10 @@ fun LineIcon(
     }
 
     val shape: Shape = when (lineIcon?.shape) {
+        LineIconShape.hexagon -> HexagonShape()
         LineIconShape.pill -> RoundedCornerShape(percent = 50)
         LineIconShape.rectangle_rounded_corner -> RoundedCornerShape(percent = 20)
+        LineIconShape.trapezoid -> TrapezoidShape()
         else -> RectangleShape
     }
     val borderColor: Color = lineIcon?.getBorderColor() ?: Color.Transparent