pub fn ellipse_from_endpoint(
        &mut self,
        radius_x: f64,
        radius_y: f64,
        rotation: f64,
        large: bool,
        clockwise: bool,
        x: f64,
        y: f64,
    ) {
        let start = self.last_pos.unwrap_or_else(|| panic!("PathBuilder::move_to() is required before ellipse_from_endpoint"));
        let end = Point(x, y);
        if radius_x == 0.0 || radius_y == 0.0 {
            self.set_pos(end);
            self.push(PathItem::Line(Line(start, end)));
            return;
        }
        let mut radius_x = radius_x.abs();
        let mut radius_y = radius_y.abs();
        let p = (start - end).rotate(-rotation) / 2.0;
        {
            let s = (p.0 / radius_x).powi(2) + (p.1 / radius_y).powi(2);
            if 1.0 < s {
                radius_x *= s.sqrt();
                radius_y *= s.sqrt();
            }
        }
        let (rx2, ry2) = (radius_x.powi(2), radius_y.powi(2));
        let mut a = ((rx2 * ry2 - rx2 * p.1.powi(2) - ry2 * p.0.powi(2)) / (rx2 * p.1.powi(2) + ry2 * p.0.powi(2))).sqrt();
        if large == clockwise {
            a = -a;
        }
        let q = Point(radius_x * p.1 / radius_y, -radius_y * p.0 / radius_x) * a;
        let center = q.rotate(rotation) + (start + end) / 2.0;
        let a1 = Point((p.0 - q.0) / radius_x, (p.1 - q.1) / radius_y);
        let mut angle1 = (a1.0 / a1.norm()).acos().copysign(a1.1);
        let a2 = Point(-(p.0 + q.0) / radius_x, -(p.1 + q.1) / radius_y);
        let mut angle2 = (a2.0 / a2.norm()).acos().copysign(a2.1);
        if clockwise && angle2 < angle1 {
            angle2 += PI * 2.0;
        }
        if !clockwise && angle1 < angle2 {
            angle1 += PI * 2.0;
        }
        let ellipse = PathItem::Ellipse(Ellipse {
            center,
            radius_x,
            radius_y,
            rotation,
            angle1,
            angle2,
        });
        self.set_pos(end);
        self.push(ellipse);
    }
/// Add an endpoint-parameterized ellipse.
Add an endpoint-parameterized ellipse.
Add an endpoint - parameterized ellipse .
pub fn ellipse_from_endpoint(
        &mut self,
        radius_x: f64,
        radius_y: f64,
        rotation: f64,
        large: bool,
        clockwise: bool,
        x: f64,
        y: f64,
    ) {
        let start = self.last_pos.unwrap_or_else(|| panic!("PathBuilder::move_to() is required before ellipse_from_endpoint"));
        let end = Point(x, y);
        if radius_x == 0.0 || radius_y == 0.0 {
            self.set_pos(end);
            self.push(PathItem::Line(Line(start, end)));
            return;
        }
        let mut radius_x = radius_x.abs();
        let mut radius_y = radius_y.abs();
        let p = (start - end).rotate(-rotation) / 2.0;
        {
            let s = (p.0 / radius_x).powi(2) + (p.1 / radius_y).powi(2);
            if 1.0 < s {
                radius_x *= s.sqrt();
                radius_y *= s.sqrt();
            }
        }
        let (rx2, ry2) = (radius_x.powi(2), radius_y.powi(2));
        let mut a = ((rx2 * ry2 - rx2 * p.1.powi(2) - ry2 * p.0.powi(2)) / (rx2 * p.1.powi(2) + ry2 * p.0.powi(2))).sqrt();
        if large == clockwise {
            a = -a;
        }
        let q = Point(radius_x * p.1 / radius_y, -radius_y * p.0 / radius_x) * a;
        let center = q.rotate(rotation) + (start + end) / 2.0;
        let a1 = Point((p.0 - q.0) / radius_x, (p.1 - q.1) / radius_y);
        let mut angle1 = (a1.0 / a1.norm()).acos().copysign(a1.1);
        let a2 = Point(-(p.0 + q.0) / radius_x, -(p.1 + q.1) / radius_y);
        let mut angle2 = (a2.0 / a2.norm()).acos().copysign(a2.1);
        if clockwise && angle2 < angle1 {
            angle2 += PI * 2.0;
        }
        if !clockwise && angle1 < angle2 {
            angle1 += PI * 2.0;
        }
        let ellipse = PathItem::Ellipse(Ellipse {
            center,
            radius_x,
            radius_y,
            rotation,
            angle1,
            angle2,
        });
        self.set_pos(end);
        self.push(ellipse);
    }
pub fn ellipse_from_endpoint ( & mut self , radius_x : f64 , radius_y : f64 , rotation : f64 , large : bool , clockwise : bool , x : f64 , y : f64 , ) { let start = self . last_pos . unwrap_or_else ( | | panic ! ( " " ) ) ; let end = Point ( x , y ) ; if radius_x == 0.0 || radius_y == 0.0 { self . set_pos ( end ) ; self . push ( PathItem :: Line ( Line ( start , end ) ) ) ; return ; } let mut radius_x = radius_x . abs ( ) ; let mut radius_y = radius_y . abs ( ) ; let p = ( start - end ) . rotate ( - rotation ) / 2.0 ; { let s = ( p . 0 / radius_x ) . powi ( 2 ) + ( p . 1 / radius_y ) . powi ( 2 ) ; if 1.0 < s { radius_x *= s . sqrt ( ) ; radius_y *= s . sqrt ( ) ; } } let ( rx2 , ry2 ) = ( radius_x . powi ( 2 ) , radius_y . powi ( 2 ) ) ; let mut a = ( ( rx2 * ry2 - rx2 * p . 1 . powi ( 2 ) - ry2 * p . 0 . powi ( 2 ) ) / ( rx2 * p . 1 . powi ( 2 ) + ry2 * p . 0 . powi ( 2 ) ) ) . sqrt ( ) ; if large == clockwise { a = - a ; } let q = Point ( radius_x * p . 1 / radius_y , - radius_y * p . 0 / radius_x ) * a ; let center = q . rotate ( rotation ) + ( start + end ) / 2.0 ; let a1 = Point ( ( p . 0 - q . 0 ) / radius_x , ( p . 1 - q . 1 ) / radius_y ) ; let mut angle1 = ( a1 . 0 / a1 . norm ( ) ) . acos ( ) . copysign ( a1 . 1 ) ; let a2 = Point ( - ( p . 0 + q . 0 ) / radius_x , - ( p . 1 + q . 1 ) / radius_y ) ; let mut angle2 = ( a2 . 0 / a2 . norm ( ) ) . acos ( ) . copysign ( a2 . 1 ) ; if clockwise && angle2 < angle1 { angle2 += PI * 2.0 ; } if ! clockwise && angle1 < angle2 { angle1 += PI * 2.0 ; } let ellipse = PathItem :: Ellipse ( Ellipse { center , radius_x , radius_y , rotation , angle1 , angle2 , } ) ; self . set_pos ( end ) ; self . push ( ellipse ) ; }
Add an endpoint-parameterized ellipse.
Add an endpoint - parameterized ellipse .
&mut self
radius_x
f64
radius_y
f64
rotation
f64
large
bool
clockwise
bool
x
f64
y
f64