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use crate::math::Vec2;
use crate::transform::Transform;
use raylib::drawing::RaylibDraw;
use raylib::ffi::Color;
pub struct DimensionIndicator {
/// The lines that are used to draw the Dimension Indicator. For a rectangle for instance these
/// would be two. One for width and one for height.
length_lines: Vec<(Vec2<f64>, Vec2<f64>)>,
}
impl DimensionIndicator {
#[allow(clippy::new_without_default)]
pub fn new() -> Self {
Self {
length_lines: Vec::new(),
}
}
pub fn from_corner_points(corner_points: &[Vec2<f64>]) -> Self {
let mut this = Self::new();
this.update_dimensions(corner_points);
this
}
pub fn clear_dimensions(&mut self) {
self.length_lines.clear();
}
/// Update the dimensions by analysing a given set of points and adjusting the internal
/// (measured) dimensions.
pub fn update_dimensions(&mut self, corner_points: &[Vec2<f64>]) {
if corner_points.len() < 2 {
warn!("Cannot discern dimensions when not at least two points are given. The dimensions were not updated.");
return;
}
// Discern the bounding box for the given corner points.
let mut min = corner_points[0];
let mut max = corner_points[0];
for point in corner_points.iter().skip(1) {
if point.x < min.x {
min.x = point.x;
}
if point.x > max.x {
max.x = point.x;
}
if point.y < min.y {
min.y = point.y;
}
if point.y > max.y {
max.y = point.y;
}
}
// For now, only use the width and height vectors.
// TODO: Change to a more sophisticated approach.
self.length_lines.clear();
// Horizontal dimensions, left to right.
self.length_lines
.push((Vec2::new(min.x, max.y), Vec2::new(max.x, max.y)));
// Vertical dimensions, bottom to top.
self.length_lines
.push((Vec2::new(max.x, max.y), Vec2::new(max.x, min.y)));
}
pub fn draw(&self, rld: &mut impl RaylibDraw, transform: &Transform) {
// Draw all the dimension lines.
for (start, end) in &self.length_lines {
// Don't draw anything if the length is zero.
if start == end {
continue;
}
/* Get the vector that is perpendicular and points right/down from the line, assuming
* the lines prefer left as start over right and bottom over top.
*/
let line_normal = {
// Start with the direction of the line vector.
let dir = *start - *end;
// Calculate perpendicular vec and normalise.
dir.rotated_90_clockwise() / dir.length()
};
// To not have the line directly in the rect, move start and end outside a bit.
let start_px = transform.point_m_to_px(start) + line_normal * 10.;
let end_px = transform.point_m_to_px(end) + line_normal * 10.;
/* Draw the indicator line, with stubs at both ends. */
let line_colour = Color {
r: 200,
g: 200,
b: 200,
a: 255,
};
// First the two stubs.
rld.draw_line_ex(
start_px - line_normal * 5.,
start_px + line_normal * 5.,
2.,
line_colour,
);
rld.draw_line_ex(
end_px - line_normal * 5.,
end_px + line_normal * 5.,
2.,
line_colour,
);
// Then the actual indicator line.
rld.draw_line_ex(start_px, end_px, 2., line_colour);
/* Draw the indicator text showing how long this line is in meters.
* It should be placed in the middle of the line, but not into the line directly, so it
* will be moved out by the normal.
*/
let text_pos = transform.point_m_to_px(&((*end + *start) / 2.)) + line_normal * 20.;
rld.draw_text(
&format!("{}m", &(*end - *start).length()),
text_pos.x as i32,
text_pos.y as i32,
20,
line_colour,
);
}
}
}
|
