Create Vec2 structure and functions.

src/vec2.zig

@@ -0,0 +1,58 @@
+//! This module provides functions for creating and manipulating 2D
+//! vectors with integer precision.
+const expect = @import("std").testing.expect;
+
+pub const Vec2 = struct {
+    x: i32,
+    y: i32,
+
+    pub fn init(x: i32, y: i32) Vec2 {
+        return Vec2 {
+            .x = x,
+            .y = y,
+        };
+    }
+
+    pub fn add(self: Vec2, other: Vec2) Vec2 {
+        return Vec2 {
+            .x = self.x + other.x,
+            .y = self.y + other.y,
+        };
+    }
+
+    pub fn sub(self: Vec2, other: Vec2) Vec2 {
+        return Vec2 {
+            .x = self.x - other.x,
+            .y = self.y - other.y,
+        };
+    }
+};
+
+test "create Vec2 w/ positive values" {
+    const vector = Vec2.init(15984, 95715);
+    expect(vector.x == 15984);
+    expect(vector.y == 95715);
+}
+
+test "create Vec2 w/ negative values" {
+    const vector = Vec2.init(-51428, -56123);
+    expect(vector.x == -51428);
+    expect(vector.y == -56123);
+}
+
+test "add two Vec2 using dot syntax" {
+    const vector_1 = Vec2.init(6712, 981);
+    const vector_2 = Vec2.init(-1823, 12);
+    const vector_sum = vector_1.add(vector_2);
+    expect(vector_sum.x == 4889);
+    expect(vector_sum.y == 993);
+}
+
+test "calculate difference between two Vec2 using dot syntax" {
+    const vector_1 = Vec2.init(6712, 981);
+    const vector_2 = Vec2.init(-1823, 12);
+    const vector_diff = vector_1.sub(vector_2);
+    expect(vector_diff.x == 8535);
+    expect(vector_diff.y == 969);
+}
+