43 lines
1.4 KiB
Kotlin
43 lines
1.4 KiB
Kotlin
import org.openrndr.application
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import org.openrndr.color.ColorRGBa
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import org.openrndr.draw.circleBatch
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import org.openrndr.draw.shadeStyle
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/*
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This program demonstrates creating "pre-baked" batches of circles.
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Batches can have varying fill, stroke and strokeWeight settings.
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Batches are (currently) static but stored in GPU memory but can be
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animated using a vertex shader. Batches are fast to draw.
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*/
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fun main() = application {
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program {
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val batch = drawer.circleBatch {
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for (i in 0 until 2000) {
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fill = ColorRGBa.PINK.shade(Math.random())
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strokeWeight = Math.random() * 5
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circle(width * 0.5, height * 0.5, 20 * Math.random() + 5)
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}
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}
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extend {
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drawer.clear(ColorRGBa.GRAY)
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// The following optional shadeStyle animates the batch
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// by using polar coordinates:
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// sets angle and radius based on time and shape ID.
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drawer.shadeStyle = shadeStyle {
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vertexTransform = """
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float a = float(c_instance) + p_time * 0.1;
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float r = 200.0 + 100.0 * sin(a * 0.998);
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x_position.x += r * sin(a);
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x_position.y += r * cos(a);
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""".trimIndent()
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parameter("time", seconds)
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}
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drawer.circles(batch)
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}
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}
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} |