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pathfinder
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This commit is contained in:
Patrick Walton 2019-02-06 13:45:15 -08:00
parent 27e47b4c39
commit b5c73f25f0
1 changed files with 22 additions and 11 deletions
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33
geometry/src/dilation.rs
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@ -25,6 +25,7 @@ impl<'a> ContourDilator<'a> {
}
pub fn dilate(&mut self) {
println!("---");
let scale = self.amount.scale_xy(match self.orientation {
Orientation::Ccw => Point2DF32::new( 1.0, -1.0),
Orientation::Cw => Point2DF32::new(-1.0, 1.0),
@ -32,20 +33,24 @@ impl<'a> ContourDilator<'a> {
let input = self.contour.clone();
let mut position = input.position_of(0);
let first_position = input.position_of(0);
let mut prev_point_index = 0;
let mut prev_position;
loop {
prev_point_index = input.prev_point_index_of(prev_point_index);
prev_position = input.position_of(prev_point_index);
if prev_point_index == 0 || prev_position != position {
if prev_point_index == 0 || prev_position != first_position {
break;
}
}
// Find the starting position.
let first_point_index = input.next_point_index_of(prev_point_index);
let mut current_point_index = first_point_index;
let mut position = first_position;
let mut prev_vector = (position - prev_position).normalize();
let mut current_point_index = 0;
loop {
// Find the next non-degenerate position.
@ -53,26 +58,32 @@ impl<'a> ContourDilator<'a> {
let mut next_position;
loop {
next_point_index = input.next_point_index_of(next_point_index);
if next_point_index == first_point_index {
next_position = first_position;
break;
}
next_position = input.position_of(next_point_index);
if next_point_index == current_point_index || next_position != position {
break;
}
}
let next_vector = (next_position - position).normalize();
/*
println!("prev={} cur={} next={}",
prev_point_index,
current_point_index,
next_point_index);
*/
// Calculate new position by moving the point by the bisector.
let next_vector = (next_position - position).normalize();
//let (prev_vector, next_vector) = (prev_position - position, next_position - position);
let bisector = prev_vector.yx() + next_vector.yx();
/*let bisector = prev_vector.scale(next_vector.length()) +
next_vector.scale(prev_vector.length());*/
let bisector_length = bisector.length();
let scaled_bisector = if bisector_length == 0.0 {
Point2DF32::default()
} else {
bisector.scale_xy(scale).scale(1.0 / bisector_length)
};
let new_position = position - scaled_bisector;
/*
@ -105,8 +116,8 @@ impl<'a> ContourDilator<'a> {
point_index = input.next_point_index_of(point_index);
}
// We're done if we start to loop around.
if next_point_index < current_point_index {
// Check to see if we're done.
if next_point_index == first_point_index {
break;
}