Use color.paper() in GeomContext.

demo/plot-common/src/commonMain/kotlin/demo/plot/common/model/EmptyGeomContext.kt

@@ -23,7 +23,7 @@ class EmptyGeomContext : GeomContext {
  override val flipped: Boolean = false
  override val targetCollector: GeomTargetCollector = NullGeomTargetCollector()
  override val annotations: Annotations? = null
- override val plotBackground: Color = Color.WHITE
+ override val backgroundColor: Color = Color.WHITE
 
  override fun getResolution(aes: org.jetbrains.letsPlot.core.plot.base.Aes<Double>): Double {
  throw IllegalStateException("Not available in an empty geom context")

plot-base/src/commonMain/kotlin/org/jetbrains/letsPlot/core/plot/base/GeomContext.kt

@@ -15,7 +15,7 @@ interface GeomContext {
  val flipped: Boolean
  val targetCollector: GeomTargetCollector
  val annotations: Annotations?
- val plotBackground: Color
+ val backgroundColor: Color
 
  // ToDo: Just positional resolution along x or y-axis. Also, its now equal to "data resolution". No need to compute it in 'Aesthetics'.
  fun getResolution(aes: Aes<Double>): Double

plot-base/src/commonMain/kotlin/org/jetbrains/letsPlot/core/plot/base/geom/PieGeom.kt

@@ -67,7 +67,7 @@ class PieGeom : GeomBase(), WithWidth, WithHeight {
  root.appendNodes(pieSectors.map(::buildSvgArcs))
  if (spacerWidth > 0) {
  root.appendNodes(
- buildSvgSpacerLines(pieSectors, width = spacerWidth, color = spacerColor ?: ctx.plotBackground)
+ buildSvgSpacerLines(pieSectors, width = spacerWidth, color = spacerColor ?: ctx.backgroundColor)
  )
  }
 

plot-base/src/commonTest/kotlin/org/jetbrains/letsPlot/core/plot/base/BogusContext.kt

@@ -18,7 +18,7 @@ object BogusContext : GeomContext {
  get() = error("Not available in a bogus geom context")
  override val annotations: Annotations
  get() = error("Not available in a bogus geom context")
- override val plotBackground: Color
+ override val backgroundColor: Color
  get() = error("Not available in a bogus geom context")
 
  override fun getResolution(aes: Aes<Double>): Double {

plot-builder/src/commonMain/kotlin/org/jetbrains/letsPlot/core/plot/builder/DemoAndTest.kt

@@ -27,7 +27,7 @@ object DemoAndTest {
  coord = coord,
  flippedAxis = flippedAxis,
  targetCollector = targetCollector,
- plotBackground = plotBackground
+ backgroundColor = plotBackground
  )
  }
 }

plot-builder/src/commonMain/kotlin/org/jetbrains/letsPlot/core/plot/builder/assemble/GeomContextBuilder.kt

@@ -28,7 +28,7 @@ class GeomContextBuilder : ImmutableGeomContext.Builder {
  private var geomTargetCollector: GeomTargetCollector = NullGeomTargetCollector()
  private var fontFamilyRegistry: FontFamilyRegistry? = null
  private var annotations: Annotations? = null
- private var plotBackground: Color = Color.WHITE
+ private var backgroundColor: Color = Color.WHITE
 
  constructor()
 
@@ -39,7 +39,7 @@ class GeomContextBuilder : ImmutableGeomContext.Builder {
  aesBounds = ctx._aesBounds
  geomTargetCollector = ctx.targetCollector
  annotations = ctx.annotations
- plotBackground = ctx.plotBackground
+ backgroundColor = ctx.backgroundColor
  }
 
  override fun flipped(flipped: Boolean): ImmutableGeomContext.Builder {
@@ -77,8 +77,8 @@ class GeomContextBuilder : ImmutableGeomContext.Builder {
  return this
  }
 
- override fun plotBackground(color: Color): ImmutableGeomContext.Builder {
- this.plotBackground = color
+ override fun backgroundColor(color: Color): ImmutableGeomContext.Builder {
+ this.backgroundColor = color
  return this
  }
 
@@ -95,7 +95,7 @@ class GeomContextBuilder : ImmutableGeomContext.Builder {
  override val flipped: Boolean = b.flipped
  override val targetCollector = b.geomTargetCollector
  override val annotations = b.annotations
- override val plotBackground = b.plotBackground
+ override val backgroundColor = b.backgroundColor
 
  private val fontFamilyRegistry: FontFamilyRegistry? = b.fontFamilyRegistry
 

plot-builder/src/commonMain/kotlin/org/jetbrains/letsPlot/core/plot/builder/assemble/ImmutableGeomContext.kt

@@ -34,7 +34,7 @@ interface ImmutableGeomContext : GeomContext {
 
  fun annotations(annotations: Annotations?): Builder
 
- fun plotBackground(color: Color): Builder
+ fun backgroundColor(color: Color): Builder
 
  fun build(): ImmutableGeomContext
  }

plot-builder/src/commonMain/kotlin/org/jetbrains/letsPlot/core/plot/builder/frame/SquareFrameOfReference.kt

@@ -176,7 +176,7 @@ internal class SquareFrameOfReference(
  coord,
  flipAxis,
  targetCollector,
- theme.plot().backgroundFill()
+ theme.colors().paper()
  )
 
  val geomBounds = layoutInfo.geomInnerBounds
@@ -272,7 +272,7 @@ internal class SquareFrameOfReference(
  coord: CoordinateSystem,
  flippedAxis: Boolean,
  targetCollector: GeomTargetCollector,
- plotBackground: Color
+ backgroundColor: Color
  ): SvgComponent {
  val rendererData = LayerRendererUtil.createLayerRendererData(layer)
 
@@ -311,7 +311,7 @@ internal class SquareFrameOfReference(
  .geomTargetCollector(targetCollector)
  .fontFamilyRegistry(layer.fontFamilyRegistry)
  .annotations(rendererData.annotations)
- .plotBackground(plotBackground)
+ .backgroundColor(backgroundColor)
  .build()
 
  val pos = rendererData.pos