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[orx-palette] Add ColorBrewer2, demos, update README (#363)

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This commit is contained in:
Abe Pazos
2025-09-02 06:38:30 +02:00
committed by GitHub
parent af4c2b20d6
commit d1e5ba634d
14 changed files with 3057 additions and 66 deletions
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22
orx-palette/src/jvmDemo/kotlin/DemoColorBrewer2_01.kt Normal file
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import org.openrndr.application
/**
* Demonstrates how to use a ColorBrewer2 palette.
* Finds the first available palette with 5 colors,
* then draws concentric circles filled with those colors.
*/
fun main() = application {
configure {
width = 720
height = 720
}
program {
val palette = colorBrewer2Palettes(numberOfColors = 5).first().colors
extend {
palette.forEachIndexed { i, color ->
drawer.fill = color
drawer.circle(drawer.bounds.center, 300.0 - i * 40.0)
}
}
}
}

41
orx-palette/src/jvmDemo/kotlin/DemoColorBrewer2_02.kt Normal file
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import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.extra.shapes.primitives.Arc
import org.openrndr.extra.shapes.primitives.grid
/**
* Visualizes the ColorBrewer2 color palettes with 8 colors as circles
* made of colored arcs.
*/
fun main() = application {
configure {
width = 720
height = 720
}
program {
val palettes = colorBrewer2Palettes(numberOfColors = 8)
// Make a grid and discard some cells if there are more cells than palettes
val grid = drawer.bounds.grid(6, 6).flatten().take(palettes.size)
extend {
drawer.clear(ColorRGBa.WHITE)
// For each grid cell
grid.forEachIndexed { i, rect ->
// Find the corresponding palette
val palette = palettes[i].colors
// And display its colors on thick arcs
palette.forEachIndexed { ci, color ->
drawer.strokeWeight = 15.0
drawer.stroke = color
drawer.fill = null
drawer.contour(
Arc(
rect.center, rect.width * 0.35,
360.0 * (ci + 0.0) / palette.size,
360.0 * (ci + 1.0) / palette.size
).contour
)
}
}
}
}
}

38
orx-palette/src/jvmDemo/kotlin/DemoColorBrewer2_03.kt Normal file
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import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.extra.shapes.primitives.Arc
import org.openrndr.extra.shapes.primitives.grid
/**
* Visualizes 49 ColorBrewer2 color palettes of type "Diverging" as circles
* made of colored arcs. Since there are more palettes than grid cells,
* not all palettes are visualized.
*/
fun main() = application {
configure {
width = 720
height = 720
}
program {
val palettes = colorBrewer2Palettes(paletteType = ColorBrewer2Type.Diverging)
val grid = drawer.bounds.grid(7, 7).flatten().take(palettes.size)
extend {
drawer.clear(ColorRGBa.WHITE)
grid.forEachIndexed { i, rect ->
val palette = palettes[i].colors
palette.forEachIndexed { ci, color ->
drawer.strokeWeight = 15.0
drawer.stroke = color
drawer.fill = null
drawer.contour(
Arc(
rect.center, rect.width * 0.4,
360.0 * (ci + 0.0) / palette.size,
360.0 * (ci + 1.0) / palette.size
).contour
)
}
}
}
}
}

31
orx-palette/src/jvmDemo/kotlin/DemoPaletteStudio01.kt Normal file
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import org.openrndr.application
import org.openrndr.extra.palette.PaletteStudio
/**
* Demonstrates how to access palette colors using PaletteStudio.
* A new random palette is loaded every 60 animation frames.
*/
fun main() = application {
configure {
width = 720
height = 720
}
program {
val paletteStudio = PaletteStudio()
// Choose a specific initial palette
paletteStudio.select(11)
extend {
if(frameCount % 60 == 50) {
paletteStudio.randomPalette()
}
drawer.clear(paletteStudio.background)
paletteStudio.colors2.forEachIndexed { i, color ->
drawer.fill = color
drawer.circle(drawer.bounds.center, 300.0 - i * 40.0)
}
}
}
}

68
orx-palette/src/jvmDemo/kotlin/DemoPaletteStudio02.kt Normal file
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import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.extra.palette.PaletteStudio
/**
* Demonstrates how to create a design using PaletteStudio.
* Press the `c` key to load a random palette.
*
*/
fun main() = application {
configure {
title = "Palette"
width = 720
height = 720
}
program {
val paletteStudio = PaletteStudio()
val colors = mutableListOf<ColorRGBa>()
fun fillColors() {
for (n in 0..36) {
when (n) {
12 -> paletteStudio.loadCollection(PaletteStudio.Collections.TWO)
24 -> paletteStudio.loadCollection(PaletteStudio.Collections.THREE)
}
val color = paletteStudio.colors.random()
colors.add(color)
}
}
keyboard.keyDown.listen {
if (it.name == "c") {
colors.clear()
fillColors()
}
}
fillColors()
extend {
drawer.clear(paletteStudio.background)
val size = 120.0
val radius = size / 2.0
for (x in 0 until 6) {
for (y in 0 until 6) {
val index = x + y * 6
val color = colors[index]
val x = size * x
val y = size * y
drawer.fill = color
drawer.stroke = color
if (index <= 11 || index > 23) {
drawer.circle(x + radius, y + radius, radius)
} else {
drawer.rectangle(x, y, size, size)
}
}
}
}
}
}