Labeled CalculateFacingDir()

1 files changed, 65 insertions, 0 deletions

diff --git a/src/position_util.c b/src/position_util.c
new file mode 100644
index 0000000..26a8c51
--- /dev/null
+++ b/src/position_util.c
@@ -0,0 +1,65 @@
+#include "global.h"
+#include "position_util.h"
+
+#include "constants/direction.h"
+
+const s32 gFacingDirMapping[3][3] = {
+  {DIRECTION_NORTHWEST, DIRECTION_NORTH, DIRECTION_NORTHEAST},
+  {DIRECTION_WEST, DIRECTION_SOUTH, DIRECTION_EAST},
+  {DIRECTION_SOUTHWEST, DIRECTION_SOUTH, DIRECTION_SOUTHEAST}
+};
+
+s32 CalculateFacingDir(struct Position *originPos, struct Position *targetPos)
+{
+  s32 facingDir;
+  s32 yDiff;
+  s32 xDiff;
+
+  xDiff = targetPos->x - originPos->x;
+  yDiff = targetPos->y - originPos->y;
+  if (xDiff == 0 && yDiff == 0)
+  {
+    facingDir = DIRECTION_SOUTH;
+  }
+  else
+  {
+    if (xDiff > 0)
+    {
+      xDiff = 1;
+    }
+    if (yDiff > 0)
+    {
+      yDiff = 1;
+    }
+    if (xDiff <= -1)
+    {
+      xDiff = -1;
+    }
+    if (yDiff <= -1)
+    {
+      yDiff = -1;
+    }
+    facingDir = gFacingDirMapping[yDiff + 1][xDiff + 1];
+  }
+  return facingDir;
+}
+
+s32 GetMaxPositionDifference(short param_1[],short param_2[])
+{
+  s32 diff_index1;
+  s32 diff_index0;
+
+  diff_index0 = param_1[0] - param_2[0];
+  if (diff_index0 < 0) {
+    diff_index0 = -diff_index0;
+  }
+  diff_index1 = param_1[1] - param_2[1];
+  if (diff_index1 < 0) {
+    diff_index1 = -diff_index1;
+  }
+  if (diff_index1 < diff_index0) {
+    diff_index1 = diff_index0;
+  }
+  return diff_index1;
+}
+