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/*
* Copyright (c) 2018-2019. data2viz sàrl.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package io.data2viz.shape.symbol
import io.data2viz.geom.Path
import io.data2viz.shape.pi
import io.data2viz.shape.tau
import io.data2viz.shape.Symbol
import kotlin.math.cos
import kotlin.math.sin
import kotlin.math.sqrt
class Circle : Symbol {
override fun render(path: C, size: Double): C {
val r = sqrt(size / pi)
with(path) {
moveTo(r, .0)
arc(.0, .0, r, .0, tau)
}
return path
}
}
class Cross : Symbol {
override fun render(path: C, size: Double): C {
val r = sqrt(size / 5) / 2
val r3 = 3 * r
with(path) {
moveTo(-r3, -r)
lineTo(-r, -r)
lineTo(-r, -r3)
lineTo(r, -r3)
lineTo(r, -r)
lineTo(r3, -r)
lineTo(r3, r)
lineTo(r, r)
lineTo(r, r3)
lineTo(-r, r3)
lineTo(-r, r)
lineTo(-r3, r)
closePath()
}
return path
}
}
class Diamond : Symbol {
private val tan30 = sqrt(1 / 3.0)
private val tan30_2 = tan30 * 2;
override fun render(path: C, size: Double): C {
val y = sqrt(size / tan30_2)
val x = y * tan30
with(path) {
moveTo(.0, -y)
lineTo(x, .0)
lineTo(.0, y)
lineTo(-x, .0)
closePath()
}
return path
}
}
class Square : Symbol {
override fun render(path: C, size: Double): C {
val w = sqrt(size)
val x = -w / 2.0
path.rect(x, x, w, w)
return path
}
}
class Star : Symbol {
private val ka = 0.89081309152928522810
private val kr = sin(pi / 10) / sin(7 * pi / 10)
private val kx = sin(tau / 10) * kr
private val ky = -cos(tau / 10) * kr
override fun render(path: C, size: Double): C {
val r = sqrt(size * ka)
val x = kx * r
val y = ky * r
path.moveTo(.0, -r)
path.lineTo(x, y)
for (i in 1 until 5) {
val a = tau * i / 5.0
val c = cos(a)
val s = sin(a)
path.lineTo(s * r, -c * r)
path.lineTo(c * x - s * y, s * x + c * y)
}
path.closePath();
return path
}
}
class Triangle : Symbol {
private val sqrt3 = sqrt(3.0)
override fun render(path: C, size: Double): C {
val y = -sqrt(size / (sqrt3 * 3))
with(path) {
moveTo(.0, y * 2)
lineTo(-sqrt3 * y, -y)
lineTo(sqrt3 * y, -y)
closePath()
}
return path
}
}
class Wye : Symbol {
private val c = -0.5
private val s = sqrt(3.0) / 2
private val k = 1 / sqrt(12.0)
private val a = (k / 2 + 1) * 3
override fun render(path: C, size: Double): C {
val r = sqrt(size / a)
val x0 = r / 2
val y0 = r * k
val x1 = x0
val y1 = r * k + r
val x2 = -x1
val y2 = y1
with(path) {
moveTo(x0, y0)
lineTo(x1, y1)
lineTo(x2, y2)
lineTo(c * x0 - s * y0, s * x0 + c * y0)
lineTo(c * x1 - s * y1, s * x1 + c * y1)
lineTo(c * x2 - s * y2, s * x2 + c * y2)
lineTo(c * x0 + s * y0, c * y0 - s * x0)
lineTo(c * x1 + s * y1, c * y1 - s * x1)
lineTo(c * x2 + s * y2, c * y2 - s * x2)
closePath()
}
return path
}
}
