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graphview: Place link curve control points more dynamically

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Control points are now offset by half the x distance of the start and end points instead of a constant,
which makes the curve scale better with varying distance.
This commit is contained in:
Tom A. Wagner
2021-06-28 10:41:56 +02:00
parent 58cdcd859b
commit edc4064009
1 changed files with 15 additions and 2 deletions
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17
src/view/graph_view.rs
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@@ -152,12 +152,25 @@ mod imp {
for link in self.links.borrow().values() {
if let Some((from_x, from_y, to_x, to_y)) = self.get_link_coordinates(link) {
link_cr.move_to(from_x, from_y);
link_cr.curve_to(from_x + 75.0, from_y, to_x - 75.0, to_y, to_x, to_y);
// 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,
// especially when the output port is farther right than the input port.
let half_x_dist = f64::abs(from_x - to_x) / 2.0;
link_cr.curve_to(
from_x + half_x_dist,
from_y,
to_x - half_x_dist,
to_y,
to_x,
to_y,
);
if let Err(e) = link_cr.stroke() {
warn!("Failed to draw graphview links: {}", e);
};
} else {
log::warn!("Could not get allocation of ports of link: {:?}", link);
warn!("Could not get allocation of ports of link: {:?}", link);
}
}
}