feat: add DDA line drawing algorithm (#6616)

* feat: add DDA line drawing algorithm

* refactor: clang formatting

---------

Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>

src/main/java/com/thealgorithms/geometry/DDALine.java

@@ -0,0 +1,54 @@
+package com.thealgorithms.geometry;
+
+import java.awt.Point;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The {@code DDALine} class implements the Digital Differential Analyzer (DDA)
+ * line drawing algorithm. It computes points along a line between two given
+ * endpoints using floating-point arithmetic.
+ *
+ * The algorithm is straightforward but less efficient compared to
+ * Bresenham’s line algorithm, since it relies on floating-point operations.
+ *
+ * For more information, please visit {@link https://en.wikipedia.org/wiki/Digital_differential_analyzer_(graphics_algorithm)}
+ */
+public final class DDALine {
+
+    private DDALine() {
+        // Prevent instantiation
+    }
+
+    /**
+     * Finds the list of points forming a line between two endpoints using DDA.
+     *
+     * @param x0 the x-coordinate of the starting point
+     * @param y0 the y-coordinate of the starting point
+     * @param x1 the x-coordinate of the ending point
+     * @param y1 the y-coordinate of the ending point
+     * @return an unmodifiable {@code List<Point>} containing all points on the line
+     */
+    public static List<Point> findLine(int x0, int y0, int x1, int y1) {
+        int dx = x1 - x0;
+        int dy = y1 - y0;
+
+        int steps = Math.max(Math.abs(dx), Math.abs(dy)); // number of steps
+
+        double xIncrement = dx / (double) steps;
+        double yIncrement = dy / (double) steps;
+
+        double x = x0;
+        double y = y0;
+
+        List<Point> line = new ArrayList<>(steps + 1);
+
+        for (int i = 0; i <= steps; i++) {
+            line.add(new Point((int) Math.round(x), (int) Math.round(y)));
+            x += xIncrement;
+            y += yIncrement;
+        }
+
+        return line;
+    }
+}