Add builder for pixelMap to scheme

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/mapFeatures.kt

@@ -12,11 +12,6 @@ import center.sciprog.maps.coordinates.Gmc
 import center.sciprog.maps.coordinates.GmcCurve
 import center.sciprog.maps.features.*
 import space.kscience.kmath.geometry.Angle
-import space.kscience.kmath.nd.BufferND
-import space.kscience.kmath.nd.ShapeND
-import space.kscience.kmath.nd.Strides
-import space.kscience.kmath.nd.as2D
-import space.kscience.kmath.structures.Buffer
 import kotlin.math.ceil
 
 
@@ -122,35 +117,27 @@ public fun FeatureGroup<Gmc>.text(
     TextFeature(space, coordinatesOf(position), text, fontConfig = font)
 )
 
-public fun <T> BufferND(shape: ShapeND, initializer: (IntArray) -> T): BufferND<T> {
-    val strides = Strides(shape)
-    return BufferND(strides, Buffer.boxing(strides.linearSize) { initializer(strides.index(it)) })
-}
-
 public fun FeatureGroup<Gmc>.pixelMap(
     rectangle: Rectangle<Gmc>,
     latitudeDelta: Angle,
     longitudeDelta: Angle,
     id: String? = null,
     builder: (Gmc) -> Color?,
-): FeatureRef<Gmc, PixelMapFeature<Gmc>> {
+): FeatureRef<Gmc, PixelMapFeature<Gmc>> = feature(
-    val shape = ShapeND(
-        ceil(rectangle.longitudeDelta / latitudeDelta).toInt(),
-        ceil(rectangle.latitudeDelta / longitudeDelta).toInt()
-    )
-
-    return feature(
     id,
     PixelMapFeature(
         space,
         rectangle,
-            BufferND(shape) { (i, j) ->
+        Structure2D(
+            ceil(rectangle.longitudeDelta / latitudeDelta).toInt(),
+            ceil(rectangle.latitudeDelta / longitudeDelta).toInt()
+
+        ) { (i, j) ->
             val longitude = rectangle.left + longitudeDelta * i
             val latitude = rectangle.bottom + latitudeDelta * j
             builder(
                 Gmc(latitude, longitude)
             )
-            }.as2D()
+        }
     )
-    )
+)
-}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/FeatureGroup.kt

@@ -4,6 +4,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateMapOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.snapshots.SnapshotStateMap
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.graphics.vector.ImageVector
@@ -12,6 +13,8 @@ import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
 import center.sciprog.attributes.*
 import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.nd.*
+import space.kscience.kmath.structures.Buffer
 
 //@JvmInline
 //public value class FeatureId<out F : Feature<*>>(public val id: String)
@@ -280,3 +283,23 @@ public fun <T : Any> FeatureGroup<T>.text(
     id,
     TextFeature(space, position, text, fontConfig = font, attributes = attributes)
 )
+
+public fun <T> StructureND(shape: ShapeND, initializer: (IntArray) -> T): StructureND<T> {
+    val strides = Strides(shape)
+    return BufferND(strides, Buffer.boxing(strides.linearSize) { initializer(strides.index(it)) })
+}
+
+public fun <T> Structure2D(rows: Int, columns: Int, initializer: (IntArray) -> T): Structure2D<T> {
+    val strides = Strides(ShapeND(rows, columns))
+    return BufferND(strides, Buffer.boxing(strides.linearSize) { initializer(strides.index(it)) }).as2D()
+}
+
+public fun <T : Any> FeatureGroup<T>.pixelMap(
+    rectangle: Rectangle<T>,
+    pixelMap: Structure2D<Color?>,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, PixelMapFeature<T>> = feature(
+    id,
+    PixelMapFeature(space, rectangle, pixelMap, attributes = attributes)
+)

maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/schemeFeatures.kt

@@ -1,6 +1,7 @@
 package center.sciprog.maps.scheme
 
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.graphics.vector.ImageVector
@@ -10,6 +11,7 @@ import androidx.compose.ui.unit.dp
 import center.sciprog.attributes.Attributes
 import center.sciprog.maps.features.*
 import space.kscience.kmath.geometry.Angle
+import kotlin.math.ceil
 
 internal fun Pair<Number, Number>.toCoordinates(): XY = XY(first.toFloat(), second.toFloat())
 
@@ -81,3 +83,29 @@ fun FeatureGroup<XY>.text(
     id: String? = null,
 ): FeatureRef<XY, TextFeature<XY>> = text(position.toCoordinates(), text, id = id)
 
+public fun FeatureGroup<XY>.pixelMap(
+    rectangle: Rectangle<XY>,
+    xSize: Float,
+    ySize: Float,
+    id: String? = null,
+    builder: (XY) -> Color?,
+): FeatureRef<XY, PixelMapFeature<XY>> = feature(
+    id,
+    PixelMapFeature(
+        space,
+        rectangle,
+        Structure2D(
+            ceil(rectangle.width / xSize).toInt(),
+            ceil(rectangle.height / ySize).toInt()
+
+        ) { (i, j) ->
+            val longitude = rectangle.left + xSize * i
+            val latitude = rectangle.bottom + ySize * j
+            builder(
+                XY(latitude, longitude)
+            )
+        }
+    )
+)
+
+