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Add small control point offset to links that connect from right to left (loopbacks)

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halfbro
2021-10-13 09:11:10 +00:00
committed by Ryuukyu
parent 92dcfd61a1
commit f76235674c
1 changed files with 11 additions and 2 deletions
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13
src/view/graph_view.rs
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@@ -188,15 +188,24 @@ mod imp {
link_cr.set_dash(&[10.0, 5.0], 0.0); link_cr.set_dash(&[10.0, 5.0], 0.0);
} }
// If the output port is farther right than the input port and they have
// a similar y coordinate, apply a y offset to the control points
// so that the curve sticks out a bit.
let y_control_offset = if from_x > to_x {
f64::max(0.0, 25.0 - (from_y - to_y).abs())
} else {
0.0
// Place curve control offset by half the x distance between the two points. // Place curve control offset by half the x distance between the two points.
// This makes the curve scale well for varying distances between the two ports, // This makes the curve scale well for varying distances between the two ports,
// especially when the output port is farther right than the input port. // especially when the output port is farther right than the input port.
let half_x_dist = f64::abs(from_x - to_x) / 2.0; let half_x_dist = f64::abs(from_x - to_x) / 2.0;
link_cr.curve_to( link_cr.curve_to(
from_x + half_x_dist, from_x + half_x_dist,
from_y, from_y - y_control_offset,
to_x - half_x_dist, to_x - half_x_dist,
to_y, to_y - y_control_offset,
to_x, to_x,
to_y, to_y,
); );