47 lines
1.4 KiB
Kotlin
47 lines
1.4 KiB
Kotlin
// version 1.0.6
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const val shades = ".:!*oe&#%@"
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val light = doubleArrayOf(30.0, 30.0, -50.0)
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fun normalize(v: DoubleArray) {
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val len = Math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])
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v[0] /= len; v[1] /= len; v[2] /= len
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}
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fun dot(x: DoubleArray, y: DoubleArray): Double {
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val d = x[0] * y[0] + x[1] * y[1] + x[2] * y[2]
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return if (d < 0.0) -d else 0.0
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}
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fun drawSphere(r: Double, k: Double, ambient: Double) {
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val vec = DoubleArray(3)
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var intensity: Int
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var b : Double
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var x: Double
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var y: Double
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for (i in Math.floor(-r).toInt() .. Math.ceil(r).toInt()) {
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x = i + 0.5
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for (j in Math.floor(-2.0 * r).toInt() .. Math.ceil(2.0 * r).toInt()) {
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y = j / 2.0 + 0.5
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if (x * x + y * y <= r * r) {
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vec[0] = x
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vec[1] = y
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vec[2] = Math.sqrt(r * r - x * x - y * y)
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normalize(vec)
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b = Math.pow(dot(light, vec), k) + ambient
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intensity = ((1.0 - b) * (shades.length - 1)).toInt()
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if (intensity < 0) intensity = 0
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if (intensity >= shades.length - 1) intensity = shades.length - 2
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print(shades[intensity])
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}
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else print(' ')
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}
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println()
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}
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}
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fun main(args: Array<String>) {
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normalize(light)
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drawSphere(20.0, 4.0, 0.1)
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drawSphere(10.0, 2.0, 0.4)
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}
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