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use cairo::{Context, Error};
use std::f64::consts::PI;
use wmap_parser::Shape;
/// Draws a vertex shape at the given position
pub fn draw_vertex(
context: &Context,
shape: &Shape,
x: f64,
y: f64,
width: f64,
height: f64,
) -> Result<(), Error> {
match shape {
Shape::Circle => draw_circle(context, x, y, width, height),
Shape::Square => draw_square(context, x, y, width, height),
Shape::Triangle => draw_triangle(context, x, y, width, height),
Shape::X => draw_x(context, x, y, width, height),
}
}
fn draw_circle(context: &Context, x: f64, y: f64, width: f64, height: f64) -> Result<(), Error> {
context.save()?;
context.translate(x + width / 2.0, y + height / 2.0);
context.scale(width / 2.0, height / 2.0);
context.arc(0.0, 0.0, 1.0, 0.0, 2.0 * PI);
context.restore()?;
context.fill()?;
Ok(())
}
fn draw_square(context: &Context, x: f64, y: f64, width: f64, height: f64) -> Result<(), Error> {
context.rectangle(x, y, width, height);
context.fill()?;
Ok(())
}
fn draw_triangle(context: &Context, x: f64, y: f64, width: f64, height: f64) -> Result<(), Error> {
context.move_to(x + width / 2.0, y);
context.line_to(x + width, y + height);
context.line_to(x, y + height);
context.close_path();
context.fill()?;
Ok(())
}
fn draw_x(context: &Context, x: f64, y: f64, width: f64, height: f64) -> Result<(), Error> {
let line_width = 2.0;
context.set_line_width(line_width);
context.move_to(x, y);
context.line_to(x + width, y + height);
context.move_to(x + width, y);
context.line_to(x, y + height);
context.stroke()?;
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
use cairo::{Context, Format, ImageSurface};
#[test]
fn test_draw_shapes() {
// Just verify the functions don't panic
let surface = ImageSurface::create(Format::Rgb24, 100, 100).unwrap();
let context = Context::new(&surface).unwrap();
assert!(draw_vertex(&context, &Shape::Circle, 0.0, 0.0, 25.0, 25.0).is_ok());
assert!(draw_vertex(&context, &Shape::Square, 0.0, 0.0, 25.0, 25.0).is_ok());
assert!(draw_vertex(&context, &Shape::Triangle, 0.0, 0.0, 25.0, 25.0).is_ok());
assert!(draw_vertex(&context, &Shape::X, 0.0, 0.0, 25.0, 25.0).is_ok());
}
}
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