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Testklasse für Perlin Noise

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ngb
2022-07-14 19:27:47 +02:00
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src/test/java/schule/ngb/zm/util/NoiseTest.java
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package schule.ngb.zm.util;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*; import static org.junit.jupiter.api.Assertions.*;
class NoiseTest { class NoiseTest {
@Test
void noise() {
int N = 1000;
Noise perlin = new Noise();
Noise perlin1 = new Noise(1001);
Noise perlin2 = new Noise(2002);
Noise perlin3 = new Noise(2002);
int pp1 = 0, p1p2 = 0;
for( int i = 1; i < N; i++ ) {
double x = i * 0.005;
assertInRange(perlin.noise(x));
assertInRange(perlin1.noise(x));
assertInRange(perlin2.noise(x));
if( perlin.noise(x) == perlin1.noise(x) ) {
pp1++;
}
if( perlin1.noise(x) == perlin2.noise(x) ) {
p1p2++;
}
assertEquals(perlin2.noise(x), perlin3.noise(x), "perlin2 and perlin3 should be equal for input " + x);
}
assertTrue(pp1 < N * 0.75, "perlin and perlin1 should not be equal more than 75% (was " + pp1 / 1000.0 + ")");
assertTrue(p1p2 < N * 0.75, "perlin1 and perlin2 should not be equal more than 75% (was " + p1p2 / 1000.0 + ")");
}
private void assertInRange( double d ) {
assertTrue(0.0 <= d && 1.0 >= d);
}
private void assertInRange( double d, double min, double max ) {
assertTrue(min <= d && max >= d);
}
@Test
void noise2d() {
int N = 100;
Noise perlin = new Noise();
Noise perlin1 = new Noise(1001);
Noise perlin2 = new Noise(2002);
Noise perlin3 = new Noise(2002);
int pp1 = 0, p1p2 = 0;
for( int i = 1; i < N; i++ ) {
for( int j = 0; j < N; j++ ) {
double x = i * 0.005;
double y = j * 0.001;
assertInRange(perlin.noise(x, y));
assertInRange(perlin1.noise(x, y));
assertInRange(perlin2.noise(x, y));
if( perlin.noise(x, y) == perlin1.noise(x, y) ) {
pp1++;
}
if( perlin1.noise(x, y) == perlin2.noise(x, y) ) {
p1p2++;
}
assertEquals(perlin2.noise(x, y), perlin3.noise(x, y), "perlin2 and perlin3 should be equal for input " + x + "," + y);
}
}
assertTrue(pp1 < N * N * 0.75, "perlin and perlin1 should not be equal more than 75% (was " + (pp1 / 1.0 * N * N) + ")");
assertTrue(p1p2 < N * N * 0.75, "perlin1 and perlin2 should not be equal more than 75% (was " + (p1p2 / 1.0 * N * N) + ")");
}
@Test
void noise3d() {
int N = 100;
Noise perlin = new Noise();
Noise perlin1 = new Noise(1001);
Noise perlin2 = new Noise(2002);
Noise perlin3 = new Noise(2002);
int pp1 = 0, p1p2 = 0;
for( int i = 1; i < N; i++ ) {
for( int j = 0; j < N; j++ ) {
for( int k = 0; k < N; k++ ) {
double x = i * 0.005;
double y = j * 0.001;
double z = k * 0.004;
assertInRange(perlin.noise(x, y, z));
assertInRange(perlin1.noise(x, y, z));
assertInRange(perlin2.noise(x, y, z));
if( perlin.noise(x, y, z) == perlin1.noise(x, y, z) ) {
pp1++;
}
if( perlin1.noise(x, y, z) == perlin2.noise(x, y, z) ) {
p1p2++;
}
assertEquals(perlin2.noise(x, y, z), perlin3.noise(x, y, z), "perlin2 and perlin3 should be equal for input " + x + "," + y);
}
}
}
assertTrue(pp1 < N * N * N* 0.75, "perlin and perlin1 should not be equal more than 75% (was " + (pp1 / 1.0 * N * N * N) + ")");
assertTrue(p1p2 < N * N * N * 0.75, "perlin1 and perlin2 should not be equal more than 75% (was " + (p1p2 / 1.0 * N * N * N) + ")");
}
@Test
void range() {
Noise perlin = new Noise(1001);
perlin.setRange(100, 255);
for( int i = 0; i < 1000; i++ ) {
assertInRange(perlin.noise(i * 0.005), 100, 255);
}
perlin.setRange(-100, 100);
for( int i = 0; i < 1000; i++ ) {
assertInRange(perlin.noise(i * 0.005), -100, 100);
}
}
} }