kscience/maps-kt
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Merge pull request #1 from ArystanK/main

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Added function to draw custom markers with Kotlin DSL Canvas API
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Alexander Nozik 2022-07-16 19:28:06 +03:00 committed by GitHub
commit 3787e990ae
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4 changed files with 45 additions and 4 deletions
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18
src/commonMain/kotlin/centre/sciprog/maps/compose/FeatureBuilder.kt
View File

@ -3,9 +3,12 @@ package centre.sciprog.maps.compose
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.snapshots.SnapshotStateMap
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.vector.ImageVector
import centre.sciprog.maps.GmcBox
typealias FeatureId = String
@ -41,6 +44,21 @@ fun FeatureBuilder.circle(
id, MapCircleFeature(centerCoordinates.toCoordinates(), zoomRange, size, color)
)
fun FeatureBuilder.custom(
position: Pair<Double, Double>,
id: FeatureId? = null,
customFeatureBuilder: DrawScope.(Offset) -> Unit,
) = addFeature(id, object : MapCustomFeature(position = position.toCoordinates()) {
override fun drawFeature(drawScope: DrawScope, offset: Offset) {
customFeatureBuilder(drawScope, offset)
}
override fun getBoundingBox(zoom: Int): GmcBox {
return GmcBox(position.toCoordinates(), position.toCoordinates())
}
})
fun FeatureBuilder.line(
aCoordinates: Pair<Double, Double>,
bCoordinates: Pair<Double, Double>,

9
src/commonMain/kotlin/centre/sciprog/maps/compose/MapFeature.kt
View File

@ -1,9 +1,11 @@
package centre.sciprog.maps.compose
import androidx.compose.runtime.Composable
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.ImageBitmap
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.painter.Painter
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.graphics.vector.rememberVectorPainter
@ -31,6 +33,13 @@ class MapFeatureSelector(val selector: (zoom: Int) -> MapFeature) : MapFeature(d
}
abstract class MapCustomFeature(
zoomRange: IntRange = defaultZoomRange,
val position: GeodeticMapCoordinates
) : MapFeature(zoomRange) {
abstract fun drawFeature(drawScope: DrawScope, offset: Offset)
}
class MapCircleFeature(
val center: GeodeticMapCoordinates,
zoomRange: IntRange = defaultZoomRange,

13
src/jvmMain/kotlin/Main.kt
View File

@ -6,6 +6,7 @@ import androidx.compose.material.Text
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Home
import androidx.compose.runtime.*
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.window.Window
import androidx.compose.ui.window.application
@ -53,12 +54,22 @@ fun App() {
) {
val pointOne = 55.568548 to 37.568604
val pointTwo = 55.929444 to 37.518434
val pointThree = 60.929444 to 37.518434
image(pointOne, Icons.Filled.Home)
//remember feature Id
val circleId: FeatureId = circle(pointTwo)
val circleId: FeatureId = circle(
centerCoordinates = pointTwo,
)
custom(position = pointThree) {
drawRect(
color = Color.Red,
topLeft = it,
size = Size(20f, 20f)
)
}
line(pointOne, pointTwo)
text(pointOne, "Home")

5
src/jvmMain/kotlin/centre/sciprog/maps/compose/MapViewJvm.kt
View File

@ -222,7 +222,10 @@ actual fun MapView(
feature.color.toPaint()
)
}
is MapCustomFeature -> drawIntoCanvas { canvas ->
val offset = feature.position.toOffset()
feature.drawFeature(this, offset)
}
}
}