X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Fgame_mm%2Fmm_game.c;h=aff897b1fb2e0cae9ce1b6c235b1ff9f88db3e9e;hb=f07a84fefbf334496d5b2a06cf1afdfb1733d24b;hp=19439a8427458bed53b19d0bb1660c514f0b9f38;hpb=2da0cf37374833d0f09e69da0c74135a5f2f0132;p=rocksndiamonds.git

diff --git a/src/game_mm/mm_game.c b/src/game_mm/mm_game.c
index 19439a84..aff897b1 100644
--- a/src/game_mm/mm_game.c
+++ b/src/game_mm/mm_game.c
@@ -9,6 +9,8 @@
 // mm_game.c
 // ============================================================================
 
+#include <math.h>
+
 #include "main_mm.h"
 
 #include "mm_main.h"
@@ -4283,3 +4285,88 @@ void LoadEngineSnapshotValues_MM()
 
   RedrawPlayfield_MM(TRUE);
 }
+
+static int getAngleFromTouchDelta(int dx, int dy,  int base)
+{
+  double pi = 3.141592653;
+  double rad = atan2((double)-dy, (double)dx);
+  double rad2 = (rad < 0 ? rad + 2 * pi : rad);
+  double deg = rad2 * 180.0 / pi;
+
+  return (int)(deg * base / 360.0 + 0.5) % base;
+}
+
+int getButtonFromTouchPosition(int x, int y, int dst_mx, int dst_my)
+{
+  // calculate start (source) position to be at the middle of the tile
+  int src_mx = SX + x * TILESIZE_VAR + TILESIZE_VAR / 2;
+  int src_my = SY + y * TILESIZE_VAR + TILESIZE_VAR / 2;
+  int dx = dst_mx - src_mx;
+  int dy = dst_my - src_my;
+  int element;
+  int base = 16;
+  int phases = 16;
+  int angle_old = -1;
+  int angle_new = -1;
+  int button = 0;
+  int i;
+
+  if (!IN_LEV_FIELD(x, y))
+    return 0;
+
+  element = Feld[x][y];
+
+  if (!IS_MCDUFFIN(element) &&
+      !IS_MIRROR(element) &&
+      !IS_BEAMER(element) &&
+      !IS_POLAR(element) &&
+      !IS_POLAR_CROSS(element) &&
+      !IS_DF_MIRROR(element))
+    return 0;
+
+  angle_old = get_element_angle(element);
+
+  if (IS_MCDUFFIN(element))
+  {
+    angle_new = (dx > 0 && ABS(dy) < ABS(dx) ? ANG_RAY_RIGHT :
+		 dy < 0 && ABS(dx) < ABS(dy) ? ANG_RAY_UP :
+		 dx < 0 && ABS(dy) < ABS(dx) ? ANG_RAY_LEFT :
+		 dy > 0 && ABS(dx) < ABS(dy) ? ANG_RAY_DOWN :
+		 -1);
+  }
+  else if (IS_MIRROR(element) ||
+	   IS_DF_MIRROR(element))
+  {
+    for (i = 0; i < laser.num_damages; i++)
+    {
+      if (laser.damage[i].x == x &&
+	  laser.damage[i].y == y &&
+	  ObjHit(x, y, HIT_POS_CENTER))
+      {
+	angle_old = get_mirrored_angle(laser.damage[i].angle, angle_old);
+	angle_new = getAngleFromTouchDelta(dx, dy, base) % phases;
+
+	break;
+      }
+    }
+  }
+
+  if (angle_new == -1)
+  {
+    if (IS_MIRROR(element) ||
+	IS_DF_MIRROR(element) ||
+	IS_POLAR(element))
+      base = 32;
+
+    if (IS_POLAR_CROSS(element))
+      phases = 4;
+
+    angle_new = getAngleFromTouchDelta(dx, dy, base) % phases;
+  }
+
+  button = (angle_new == angle_old ? 0 :
+	    (angle_new - angle_old + phases) % phases < (phases / 2) ?
+	    MB_LEFTBUTTON : MB_RIGHTBUTTON);
+
+  return button;
+}