45 lines
1.5 KiB
Kotlin
45 lines
1.5 KiB
Kotlin
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package center.sciprog.maps.scheme
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import androidx.compose.ui.unit.*
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import center.sciprog.maps.features.*
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import kotlin.math.min
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class XYViewState(
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config: ViewConfig<XY>,
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canvasSize: DpSize,
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viewPoint: ViewPoint<XY>,
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) : CoordinateViewState<XY>(config, canvasSize, viewPoint) {
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override val space: CoordinateSpace<XY>
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get() = XYCoordinateSpace
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override fun DpOffset.toCoordinates(): XY = XY(
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(x - canvasSize.width / 2).value / viewPoint.zoom + viewPoint.focus.x,
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(canvasSize.height / 2 - y).value / viewPoint.zoom + viewPoint.focus.y
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)
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override fun XY.toDpOffset(): DpOffset = DpOffset(
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(canvasSize.width / 2 + (x.dp - viewPoint.focus.x.dp) * viewPoint.zoom),
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(canvasSize.height / 2 + (viewPoint.focus.y.dp - y.dp) * viewPoint.zoom)
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)
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override fun viewPointFor(rectangle: Rectangle<XY>): ViewPoint<XY> {
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val scale = min(
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canvasSize.width.value / rectangle.width,
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canvasSize.height.value / rectangle.height
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)
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return XYViewPoint(rectangle.center, scale)
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}
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override fun ViewPoint<XY>.moveBy(x: Dp, y: Dp): ViewPoint<XY> {
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val newCoordinates = XY(focus.x + x.value / zoom, focus.y + y.value / zoom)
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return XYViewPoint(newCoordinates, zoom)
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}
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override fun Rectangle<XY>.toDpRect(): DpRect {
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val topLeft = leftTop.toDpOffset()
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val bottomRight = rightBottom.toDpOffset()
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return DpRect(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y)
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}
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}
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