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add a viewbox to the svg that has the whole drawing in frame

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This commit is contained in:
Franz Dietrich 2025-10-24 16:31:25 +02:00
parent e6bc79ea7b
commit ea5bb85e88
2 changed files with 109 additions and 0 deletions
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1
turtle-lib/examples/export_svg.rs
View File

@ -10,6 +10,7 @@ async fn main() {
.right(90.0)
.forward(100.0)
.set_pen_color(macroquad::color::GRAY)
.set_pen_width(8.0)
.circle_right(50.0, 90.0, 4)
.begin_fill()
.forward(100.0)

108
turtle-lib/src/export_svg.rs
View File

@ -5,6 +5,7 @@ pub mod svg_export {
use crate::commands::TurtleCommand;
use crate::export::{DrawingExporter, ExportError};
use crate::state::{DrawCommand, TurtleWorld};
use macroquad::prelude::Vec2;
use std::fs::File;
use svg::{
node::element::{Circle, Line, Polygon, Text as SvgText},
@ -17,6 +18,25 @@ pub mod svg_export {
fn export(&self, world: &TurtleWorld, filename: &str) -> Result<(), ExportError> {
let mut doc = Document::new();
let mut min_x = f32::INFINITY;
let mut max_x = f32::NEG_INFINITY;
let mut min_y = f32::INFINITY;
let mut max_y = f32::NEG_INFINITY;
fn update_bounds(
min_x: &mut f32,
max_x: &mut f32,
min_y: &mut f32,
max_y: &mut f32,
x: f32,
y: f32,
) {
*min_x = min_x.min(x);
*max_x = max_x.max(x);
*min_y = min_y.min(y);
*max_y = max_y.max(y);
}
for turtle in &world.turtles {
for cmd in &turtle.commands {
match cmd {
@ -26,6 +46,14 @@ pub mod svg_export {
// Linie als <line>
let start = source.start_position;
let end = source.end_position;
update_bounds(
&mut min_x, &mut max_x, &mut min_y, &mut max_y, start.x,
start.y,
);
update_bounds(
&mut min_x, &mut max_x, &mut min_y, &mut max_y, end.x,
end.y,
);
let line = Line::new()
.set("x1", start.x)
.set("y1", start.y)
@ -51,6 +79,22 @@ pub mod svg_export {
let center = geom.center;
if (*angle - 360.0).abs() < 1e-3 {
// Voller Kreis
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
center.x - radius,
center.y - radius,
);
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
center.x + radius,
center.y + radius,
);
let circle = Circle::new()
.set("cx", center.x)
.set("cy", center.y)
@ -63,6 +107,23 @@ pub mod svg_export {
// Kreisbogen als <path>
let start = source.start_position;
let end = source.end_position;
// For arcs, include the full circle bounds to ensure complete visibility
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
center.x - radius,
center.y - radius,
);
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
center.x + radius,
center.y + radius,
);
let large_arc = if *angle > 180.0 { 1 } else { 0 };
let sweep = match direction {
crate::circle_geometry::CircleDirection::Left => 0,
@ -90,6 +151,14 @@ pub mod svg_export {
TurtleCommand::EndFill => {
// Fills werden als <path> mit Konturen ausgegeben
if let Some(contours) = &source.contours {
for contour in contours {
for point in contour {
update_bounds(
&mut min_x, &mut max_x, &mut min_y, &mut max_y,
point.x, point.y,
);
}
}
let mut d = String::new();
for (i, contour) in contours.iter().enumerate() {
if !contour.is_empty() {
@ -119,6 +188,30 @@ pub mod svg_export {
}
} else {
// Fallback: Dummy-Polygon
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
source.start_position.x,
source.start_position.y,
);
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
source.start_position.x + 10.0,
source.start_position.y + 10.0,
);
update_bounds(
&mut min_x,
&mut max_x,
&mut min_y,
&mut max_y,
source.start_position.x + 5.0,
source.start_position.y + 15.0,
);
let poly = Polygon::new()
.set(
"points",
@ -146,6 +239,10 @@ pub mod svg_export {
source,
..
} => {
update_bounds(
&mut min_x, &mut max_x, &mut min_y, &mut max_y, position.x,
position.y,
);
let txt = SvgText::new()
.set("x", position.x)
.set("y", position.y)
@ -157,6 +254,17 @@ pub mod svg_export {
}
}
// Set viewBox with 20px padding
if min_x.is_finite() && max_x.is_finite() && min_y.is_finite() && max_y.is_finite() {
let width = (max_x - min_x) + 40.0;
let height = (max_y - min_y) + 40.0;
let view_box = format!("{} {} {} {}", min_x - 20.0, min_y - 20.0, width, height);
doc = doc.set("viewBox", view_box);
} else {
// Default viewBox if no elements
doc = doc.set("viewBox", "0 0 400 400");
}
let mut file = File::create(filename).map_err(ExportError::Io)?;
svg::write(&mut file, &doc).map_err(ExportError::Io)?;
Ok(())