#29: method for creating line based on starting point, angle and length

build.gradle

@@ -1,6 +1,6 @@
 
 group 'ru.itmo.idu'
-version '3.7.0'
+version '3.8.0'
 
 repositories {
     maven {

src/main/java/ru/itmo/idu/geometry/GeometryUtils.java

@@ -58,6 +58,24 @@ public static LineString makeLine(Coordinate start, Coordinate end) {
         );
     }
 
+    public static LineString makeLine(Point start, Point end) {
+        return makeLine(start.getCoordinate(), end.getCoordinate());
+    }
+
+    /**
+     * Same as makeLine(start, length, angle). Different name becaulse makeLine(4 double values) already exists
+     */
+    public static LineString makeLineFromDirection(double x, double y, double length, double angleInRadians) {
+        return makeLine(new Coordinate(x, y), length, angleInRadians);
+    }
+
+    public static LineString makeLine(Coordinate start, double length, Double angleInRadians) {
+        val endX = start.x + length * Math.cos(angleInRadians);
+        val endY = start.y + length * Math.sin(angleInRadians);
+
+        return GeometryUtils.makeLine(start, new Coordinate(endX, endY));
+    }
+
     public static LineString makeLine(Coordinate... coordinates) {
         if (coordinates.length == 0) {
             return GeometryUtils.geometryFactory.createLineString();

src/test/java/ru/itmo/idu/geometry/GeometryUtilsTest.java

@@ -102,6 +102,16 @@ public void testMakeLineWorksWith3DLines() {
         assertEquals(200.0, ls.getCoordinates()[1].z);
     }
 
+    @Test
+    public void testMakeLineDirection() {
+        LineString ls = GeometryUtils.makeLineFromDirection(0.0, 0.0, 1.0, Math.PI / 4.0);
+        assertEquals(new Coordinate(0.0, 0.0), ls.getStartPoint().getCoordinate());
+        final Coordinate expectedEnd = new Coordinate(1.0 / Math.sqrt(2), 1.0 / Math.sqrt(2));
+        assertEquals(expectedEnd.x, ls.getEndPoint().getCoordinate().x, 0.0001);
+        assertEquals(expectedEnd.y, ls.getEndPoint().getCoordinate().y, 0.0001);
+        assertEquals(1.0, ls.getLength(), 0.001);
+    }
+
     @Test
     public void testFlattenGeometry() {
         List<Geometry> rz = GeometryUtils.flattenGeometry(null);