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Start line drag using canvas y coords.

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- fixes #5759
This commit is contained in:
nick_m 2015-10-29 23:37:01 +11:00
parent be69dd279b
commit 36dd7f8d9d
1 changed files with 10 additions and 5 deletions
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15
gtk2_ardour/editor_drag.cc
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@ -4317,12 +4317,12 @@ LineDrag::start_grab (GdkEvent* event, Gdk::Cursor* /*cursor*/)
origin, and ditto for y.
*/
double cx = event->button.x;
double cy = event->button.y;
double mx = event->button.x;
double my = event->button.y;
_line->parent_group().canvas_to_item (cx, cy);
_line->parent_group().canvas_to_item (mx, my);
framecnt_t const frame_within_region = (framecnt_t) floor (cx * _editor->samples_per_pixel);
framecnt_t const frame_within_region = (framecnt_t) floor (mx * _editor->samples_per_pixel);
if (!_line->control_points_adjacent (frame_within_region, _before, _after)) {
/* no adjacent points */
@ -4332,8 +4332,13 @@ LineDrag::start_grab (GdkEvent* event, Gdk::Cursor* /*cursor*/)
Drag::start_grab (event, _editor->cursors()->fader);
/* store grab start in parent frame */
double const bx = _line->nth (_before)->get_x();
double const ax = _line->nth (_after)->get_x();
double const click_ratio = (mx - bx) / (ax - bx);
_fixed_grab_x = cx;
double const cy = ((_line->nth (_before)->get_y() * click_ratio) + (_line->nth (_after)->get_y() * (1 - click_ratio)));
_fixed_grab_x = mx;
_fixed_grab_y = cy;
double fraction = 1.0 - (cy / _line->height());