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Added conversion from world coordinates to utilities.

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Respective tests also added.
This commit is contained in:
Harrison Deng 2020-04-26 20:56:10 -05:00
parent 16618ef439
commit 4f411c42fb
2 changed files with 76 additions and 0 deletions
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44
src/main/java/ca/recrown/islandsurvivalcraft/Utilities.java
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@ -4,7 +4,11 @@ import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;
import ca.recrown.islandsurvivalcraft.Types.Point2;
public class Utilities {
public final static int CHUNK_SIZE = 16;
public static <K, V> HashMap<V, ArrayList<K>> invertHashMap(HashMap<K, V> hashMap) {
HashMap<V, ArrayList<K>> res = new HashMap<>();
for (Entry<K, V> entry : hashMap.entrySet()) {
@ -25,4 +29,44 @@ public class Utilities {
int res = Math.abs(value) + add;
return negative ? - res : res;
}
public static Point2 worldToChunkCoordinates(int x, int y) {
int xRes = 0;
if (x < 0) {
xRes = (int) Math.floor((float) x / CHUNK_SIZE);
} else {
xRes = x / CHUNK_SIZE;
}
int yRes = 0;
if (x < 0) {
yRes = (int) Math.floor((float) y / CHUNK_SIZE);
} else {
yRes = y / CHUNK_SIZE;
}
return new Point2(xRes, yRes);
}
public static Point2 worldToChunkCoordinates(Point2 worldCoordinates) {
return worldToChunkCoordinates(worldCoordinates.x, worldCoordinates.y);
}
public static Point2 worldToLocalChunkCoordinates(int x, int y) {
int xRes = 0;
if (x < 0) {
xRes = CHUNK_SIZE + (x % CHUNK_SIZE);
} else {
xRes = x % CHUNK_SIZE;
}
int yRes = 0;
if (y < 0) {
yRes = CHUNK_SIZE + (y % CHUNK_SIZE);
} else {
yRes = y % CHUNK_SIZE;
}
return new Point2(xRes, yRes);
}
public static Point2 worldToLocalChunkCoordinates(Point2 worldCoordinates) {
return worldToChunkCoordinates(worldCoordinates.x, worldCoordinates.y);
}
}

32
src/test/java/ca/recrown/islandsurvivalcraft/UtilitiesTest.java
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@ -9,6 +9,8 @@ import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.api.TestInstance.Lifecycle;
import ca.recrown.islandsurvivalcraft.Types.Point2;
/**
* Unit test for simple App.
*/
@ -48,4 +50,34 @@ public class UtilitiesTest {
public void testMagnitudeAddNegative() {
assertEquals(-2, Utilities.addMagnitude(-1, 1));
}
@Test
public void testWorldToChunkCoordinatesNegativePerfect() {
assertEquals(new Point2(-4, -3), Utilities.worldToChunkCoordinates(-64, -48));
}
@Test
public void testWorldToChunkCoordinatesNegativeOff() {
assertEquals(new Point2(-4, -3), Utilities.worldToChunkCoordinates(-55, -33));
}
@Test
public void testWorldToChunkCoordinatesPositivePerfect() {
assertEquals(new Point2(4, 5), Utilities.worldToChunkCoordinates(64, 80));
}
@Test
public void testWorldToChunkCoordinatesPositiveOff() {
assertEquals(new Point2(4, 5), Utilities.worldToChunkCoordinates(67, 84));
}
@Test
public void testWorldToLocalCoordinatesNegative() {
assertEquals(new Point2(2, 5), Utilities.worldToLocalChunkCoordinates(-62, -27));
}
@Test
public void testWorldToLocalCoordinatesPositive() {
assertEquals(new Point2(7, 3), Utilities.worldToLocalChunkCoordinates(39, 83));
}
}