1 files changed, 12 insertions, 8 deletions

diff --git a/src/grail-inserter.c b/src/grail-inserter.c
index 36ab570..2e5e7af 100644
--- a/src/grail-inserter.c
+++ b/src/grail-inserter.c
@@ -21,6 +21,7 @@
  ****************************************************************************/
 
 #include "grail-inserter.h"
+#include "grail-impl.h"
 #include <malloc.h>
 #include <string.h>
 #include <errno.h>
@@ -373,15 +374,18 @@ void grail_set_bbox(struct grail *ge,
                     const struct grail_coord *tmin,
                     const struct grail_coord *tmax)
 {
+        struct touch_caps *caps = &ge->impl->dev.caps;
         struct gesture_inserter *gin = ge->gin;
-        struct grail_coord dmin, dmax;
-        double sx, sy;
-        grail_get_units(ge, &dmin, &dmax);
-        sx = (tmax->x - tmin->x) / (dmax.x - dmin.x);
-        sy = (tmax->y - tmin->y) / (dmax.y - dmin.y);
+        double tx, ty, dx, dy, sx, sy;
+        tx = tmax->x - tmin->x;
+        ty = tmax->y - tmin->y;
+        dx = caps->max_x - caps->min_x;
+        dy = caps->max_y - caps->min_y;
+        sx = tx / dx;
+        sy = ty / dy;
         gin->scale_x = sx;
         gin->scale_y = sy;
-        gin->scale_r = sqrt((sx * sx + sy * sy) / 2);
-        gin->trans_x = tmin->x - dmin.x * sx;
-        gin->trans_y = tmin->y - dmin.y * sy;
+        gin->scale_r = sqrt((tx * tx + ty * ty) / (dx * dx + dy * dy));
+        gin->trans_x = tmin->x - caps->min_x * sx;
+        gin->trans_y = tmin->y - caps->min_y * sy;
 }