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graphview: Draw links in front of nodes, instead of behind them.

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This commit is contained in:
Tom A. Wagner
2021-06-26 12:34:48 +02:00
parent 7977481689
commit 58cdcd859b
1 changed files with 33 additions and 25 deletions
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58
src/view/graph_view.rs
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@@ -96,7 +96,7 @@ mod imp {
let alloc = widget.allocation();
let cr = snapshot
let background_cr = snapshot
.append_cairo(&graphene::Rect::new(
0.0,
0.0,
@@ -107,51 +107,59 @@ mod imp {
// Try to replace the background color with a darker one from the theme.
if let Some(rgba) = widget.style_context().lookup_color("text_view_bg") {
cr.set_source_rgb(rgba.red.into(), rgba.green.into(), rgba.blue.into());
if let Err(e) = cr.paint() {
background_cr.set_source_rgb(rgba.red.into(), rgba.green.into(), rgba.blue.into());
if let Err(e) = background_cr.paint() {
warn!("Failed to paint graphview background: {}", e);
};
} // TODO: else log colour not found
// Draw a nice grid on the background.
cr.set_source_rgb(0.18, 0.18, 0.18);
cr.set_line_width(0.2); // TODO: Set to 1px
background_cr.set_source_rgb(0.18, 0.18, 0.18);
background_cr.set_line_width(0.2); // TODO: Set to 1px
let mut y = 0.0;
while y < alloc.height.into() {
cr.move_to(0.0, y);
cr.line_to(alloc.width.into(), y);
background_cr.move_to(0.0, y);
background_cr.line_to(alloc.width.into(), y);
y += 20.0; // TODO: Change to em;
}
let mut x = 0.0;
while x < alloc.width.into() {
cr.move_to(x, 0.0);
cr.line_to(x, alloc.height.into());
background_cr.move_to(x, 0.0);
background_cr.line_to(x, alloc.height.into());
x += 20.0; // TODO: Change to em;
}
if let Err(e) = cr.stroke() {
if let Err(e) = background_cr.stroke() {
warn!("Failed to draw graphview grid: {}", e);
};
// Draw all links
cr.set_line_width(2.0);
cr.set_source_rgb(0.0, 0.0, 0.0);
for link in self.links.borrow().values() {
if let Some((from_x, from_y, to_x, to_y)) = self.get_link_coordinates(link) {
cr.move_to(from_x, from_y);
cr.curve_to(from_x + 75.0, from_y, to_x - 75.0, to_y, to_x, to_y);
if let Err(e) = cr.stroke() {
warn!("Failed to draw graphview links: {}", e);
};
} else {
log::warn!("Could not get allocation of ports of link: {:?}", link);
}
}
// Draw all children
self.nodes
.borrow()
.values()
.for_each(|node| self.instance().snapshot_child(node, snapshot));
// Draw all links
let link_cr = snapshot
.append_cairo(&graphene::Rect::new(
0.0,
0.0,
alloc.width as f32,
alloc.height as f32,
))
.expect("Failed to get cairo context");
link_cr.set_line_width(2.0);
link_cr.set_source_rgb(0.0, 0.0, 0.0);
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);
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);
}
}
}
}