Add zoom to the Spline UI
Signed-off-by: Ravago Jones <ravagojones@gmail.com>
Change-Id: Id20a21c6c6caf041bef5ce518c1ddcbe75216d66
diff --git a/frc971/control_loops/python/path_edit.py b/frc971/control_loops/python/path_edit.py
index 6f54119..959b382 100755
--- a/frc971/control_loops/python/path_edit.py
+++ b/frc971/control_loops/python/path_edit.py
@@ -413,3 +413,42 @@
self.index_of_edit = -1
self.spline_edit = -1
+
+ def mouse_scroll(self, event):
+ self.mousex, self.mousey = self.input_transform.transform_point(
+ event.x, event.y)
+
+ step_size = 20 # px
+
+ if event.direction == Gdk.ScrollDirection.UP:
+ # zoom out
+ scale_by = step_size
+ elif event.direction == Gdk.ScrollDirection.DOWN:
+ # zoom in
+ scale_by = -step_size
+ else:
+ return
+
+ apparent_width, apparent_height = self.transform.transform_distance(
+ self.mToPx(FIELD.width), self.mToPx(FIELD.length))
+ scale = (apparent_width + scale_by) / apparent_width
+
+ # scale from point in field coordinates
+ point = self.mousex, self.mousey
+
+ # move the origin to point
+ self.transform.translate(point[0], point[1])
+
+ # scale from new origin
+ self.transform.scale(scale, scale)
+
+ # move back
+ self.transform.translate(-point[0], -point[1])
+
+ # snap to the edge when near 1x scaling
+ if 0.99 < self.transform.xx < 1.01 and -50 < self.transform.x0 < 50:
+ self.transform.x0 = 0
+ self.transform.y0 = 0
+ print("snap")
+
+ self.queue_draw()