Restructure into different files

movement.zig

@@ -0,0 +1,44 @@
+const term = @import("term.zig");
+const Winsize = term.Winsize;
+const primitive = @import("primitives.zig");
+const Point = primitive.Point;
+
+pub fn mv_axis_border_bounce(w: Winsize, point: *Point, axis: u8) void {
+    var cor = &point.x;
+    var dir = &point.direction.x;
+    var upper = w.ws_col;
+
+    switch (axis) {
+        'x' => {
+            cor = &point.x;
+            upper = w.ws_col;
+            dir = &point.direction.x;
+        },
+        'y' => {
+            cor = &point.y;
+            upper = w.ws_row;
+            dir = &point.direction.y;
+        },
+        'X' => {
+            cor = &point.x;
+            upper = w.ws_col;
+            dir = &point.direction.x;
+            dir.* = -1;
+        },
+        'Y' => {
+            cor = &point.y;
+            upper = w.ws_row;
+            dir = &point.direction.y;
+            dir.* = -1;
+        },
+        else => {},
+    }
+
+    if (cor.* < upper and cor.* > 0) {
+        cor.* += dir.*;
+    }
+    if (cor.* >= upper or cor.* <= 0) {
+        dir.* *= -1;
+        cor.* += dir.*;
+    }
+}