diff options
Diffstat (limited to 'src/Canvas.cpp')
| -rw-r--r-- | src/Canvas.cpp | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/src/Canvas.cpp b/src/Canvas.cpp index dcc59b2..13a326a 100644 --- a/src/Canvas.cpp +++ b/src/Canvas.cpp @@ -1181,26 +1181,31 @@ GanvCanvasImpl::port_event(GdkEvent* event, GanvPort* port) const int screen_height = gdk_screen_get_height(screen); const double drag_dx = mouse_x - control_start_x; const double drag_dy = mouse_y - control_start_y; + const double xpad = 100.0; // Pad from screen edge + const double ythresh = 0.2; // Minimum y fraction for fine - const double range_x = (drag_dx > 0) - ? (screen_width - control_start_x) - : control_start_x; + const double range_x = ((drag_dx > 0) + ? (screen_width - control_start_x) + : control_start_x) - xpad; - const double range_y = (drag_dy > 0) - ? (screen_height - control_start_y) - : control_start_y; + const double range_y = ((drag_dy > 0) + ? (screen_height - control_start_y) + : control_start_y); const double dx = drag_dx / range_x; - const double dy = drag_dy / range_y; + const double dy = fabs(drag_dy / range_y); const double value_range = (drag_dx > 0) ? port->impl->control->max - control_start_value : control_start_value - port->impl->control->min; - const double sens = fmaxf(1.0 - fabs(dy), value_range / range_x); + const double fine = (dy < 0.20) + ? 0.0 + : ((dy - ythresh) * (1/(1 + ythresh))); + const double sens = fmaxf(1.0 - fine, value_range / range_x); const double dvalue = (dx * value_range) * sens; - double value = control_start_value + dvalue; + double value = control_start_value + dvalue; if (value < port->impl->control->min) { value = port->impl->control->min; } else if (value > port->impl->control->max) { |