Basic bezier curve rendering
This commit is contained in:
parent
db66a89399
commit
da8c5f73cf
|
@ -0,0 +1,49 @@
|
||||||
|
package net.shadowfacts.cacao.geometry
|
||||||
|
|
||||||
|
import java.lang.RuntimeException
|
||||||
|
import kotlin.math.pow
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Helper class that represents a cubic bezier curve.
|
||||||
|
*
|
||||||
|
* @author shadowfacts
|
||||||
|
*/
|
||||||
|
data class BezierCurve(private val points: Array<Point>) {
|
||||||
|
|
||||||
|
init {
|
||||||
|
if (points.size != 4) {
|
||||||
|
throw RuntimeException("Cubic bezier curve must have exactly four points")
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fun point(time: Double): Point {
|
||||||
|
val x = coordinate(time, Axis.HORIZONTAL)
|
||||||
|
val y = coordinate(time, Axis.VERTICAL)
|
||||||
|
return Point(x, y)
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun coordinate(t: Double, axis: Axis): Double {
|
||||||
|
// B(t)=(1-t)^3*p0+3(1-t)^2*t*p1+3(1-t)*t^2*p2+t^3*p3
|
||||||
|
val p0 = points[0][axis]
|
||||||
|
val p1 = points[1][axis]
|
||||||
|
val p2 = points[2][axis]
|
||||||
|
val p3 = points[3][axis]
|
||||||
|
return ((1 - t).pow(3) * p0) + (3 * (1 - t).pow(2) * t * p1) + (3 * (1 - t) * t.pow(2) * p2) + (t.pow(3) * p3)
|
||||||
|
}
|
||||||
|
|
||||||
|
override fun equals(other: Any?): Boolean {
|
||||||
|
if (this === other) return true
|
||||||
|
if (javaClass != other?.javaClass) return false
|
||||||
|
|
||||||
|
other as BezierCurve
|
||||||
|
|
||||||
|
if (!points.contentEquals(other.points)) return false
|
||||||
|
|
||||||
|
return true
|
||||||
|
}
|
||||||
|
|
||||||
|
override fun hashCode(): Int {
|
||||||
|
return points.contentHashCode()
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
|
@ -21,4 +21,11 @@ data class Point(val x: Double, val y: Double) {
|
||||||
return Point(x - other.x, y - other.y)
|
return Point(x - other.x, y - other.y)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
operator fun get(axis: Axis): Double {
|
||||||
|
return when (axis) {
|
||||||
|
Axis.HORIZONTAL -> x
|
||||||
|
Axis.VERTICAL -> y
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
}
|
}
|
|
@ -9,6 +9,7 @@ import net.minecraft.client.render.VertexFormat
|
||||||
import net.minecraft.client.render.VertexFormats
|
import net.minecraft.client.render.VertexFormats
|
||||||
import net.minecraft.client.sound.PositionedSoundInstance
|
import net.minecraft.client.sound.PositionedSoundInstance
|
||||||
import net.minecraft.sound.SoundEvent
|
import net.minecraft.sound.SoundEvent
|
||||||
|
import net.shadowfacts.cacao.geometry.BezierCurve
|
||||||
import net.shadowfacts.cacao.geometry.Point
|
import net.shadowfacts.cacao.geometry.Point
|
||||||
import net.shadowfacts.cacao.geometry.Rect
|
import net.shadowfacts.cacao.geometry.Rect
|
||||||
import net.shadowfacts.cacao.util.texture.Texture
|
import net.shadowfacts.cacao.util.texture.Texture
|
||||||
|
@ -108,6 +109,14 @@ object RenderHelper {
|
||||||
GlStateManager.translated(x, y, z)
|
GlStateManager.translated(x, y, z)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @see org.lwjgl.opengl.GL11.glScaled
|
||||||
|
*/
|
||||||
|
fun scale(x: Double, y: Double, z: Double = 1.0) {
|
||||||
|
if (disabled) return
|
||||||
|
GlStateManager.scaled(x, y, z)
|
||||||
|
}
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* @see org.lwjgl.opengl.GL11.glColor4f
|
* @see org.lwjgl.opengl.GL11.glColor4f
|
||||||
*/
|
*/
|
||||||
|
|
|
@ -0,0 +1,36 @@
|
||||||
|
package net.shadowfacts.cacao.view
|
||||||
|
|
||||||
|
import com.mojang.blaze3d.platform.GlStateManager
|
||||||
|
import net.shadowfacts.cacao.geometry.BezierCurve
|
||||||
|
import net.shadowfacts.cacao.geometry.Point
|
||||||
|
import net.shadowfacts.cacao.util.Color
|
||||||
|
import net.shadowfacts.cacao.util.RenderHelper
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @author shadowfacts
|
||||||
|
*/
|
||||||
|
class BezierCurveView(val curve: BezierCurve): View() {
|
||||||
|
|
||||||
|
private val points by lazy {
|
||||||
|
val step = 0.05
|
||||||
|
var t = 0.0
|
||||||
|
val points = mutableListOf<Point>()
|
||||||
|
while (t <= 1) {
|
||||||
|
points.add(curve.point(t))
|
||||||
|
t += step
|
||||||
|
}
|
||||||
|
points
|
||||||
|
}
|
||||||
|
|
||||||
|
var lineWidth = 3f
|
||||||
|
var lineColor = Color.BLACK
|
||||||
|
|
||||||
|
override fun drawContent(mouse: Point, delta: Float) {
|
||||||
|
RenderHelper.scale(bounds.width, bounds.height)
|
||||||
|
for ((index, point) in points.withIndex()) {
|
||||||
|
val next = points.getOrNull(index + 1) ?: break
|
||||||
|
RenderHelper.drawLine(point, next, zIndex, lineWidth, lineColor)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
Loading…
Reference in New Issue