Struct CurveTransform 

pub struct CurveTransform {
    pub position: Matrix<f32, Const<2>, Const<1>, ArrayStorage<f32, 2, 1>>,
    pub scale: Matrix<f32, Const<2>, Const<1>, ArrayStorage<f32, 2, 1>>,
    pub bounds: Rect<f32>,
    pub curve_to_local: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>,
    pub local_to_curve: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>,
    pub screen_to_curve: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>,
    pub curve_to_screen: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>,
}

This object represents the transformation curve coordinates into the local coordinates of the curve editor widget and into the coordinates of the screen. Using this object allows other widgets to align themselves perfectly with the coordinates of a curve editor.

Since widgets are not mutable during layout and rendering, a CurveTransform is intended to be used within a CurveTransformCell which provides interior mutability.

Fields

position: Matrix<f32, Const<2>, Const<1>, ArrayStorage<f32, 2, 1>>

Position of the center of the curve editor in the curve coordinate space.

scale: Matrix<f32, Const<2>, Const<1>, ArrayStorage<f32, 2, 1>>

Scape of the curve editor: multiply curve space units by this to get screen space units.

bounds: Rect<f32>

Location of the curve editor on the screen, in screen space units.

curve_to_local: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>

Transform a point on a curve into a point in the local space of the curve editor. Before applying this transformation, (0,0) is the origin of the curve, and positive-y is up. After the transform, (0,0) is the top-left corner of the editor, and positive-y is down.

local_to_curve: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>

The inverse of curve_to_local, transforming a point in the local space of the editor widget into a point in the space of the curve.

screen_to_curve: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>

Transform a point on the screen into a point in the space of the curve. For example, a mouse click position would be transformed into the corresponding (x,y) coordinates of a cure key that would result from the click.

curve_to_screen: Matrix<f32, Const<3>, Const<3>, ArrayStorage<f32, 3, 3>>

Transform a point on the curve into a point on the screen.

Implementations

impl CurveTransform

pub fn update_transform(&mut self)

Construct the transformations matrices for the current position, scale, and bounds.

pub fn x_step_iter(&self, grid_size: f32) -> StepIterator

Just like CurveTransform::y_step_iter but for x-coordinates. Iterate through a list of x-coordinates across the width of the bounds. The x-coordinates are in curve-space, but their distance apart should be at least grid_size in screen-space.

This iterator indates where grid lines should be drawn to make a curve easier to read for the user.

pub fn y_step_iter(&self, grid_size: f32) -> StepIterator

Just like CurveTransform::x_step_iter but for y-coordinates. Iterate through a list of y-coordinates across the width of the bounds. The y-coordinates are in curve-space, but their distance apart should be at least grid_size in screen-space.

This iterator indates where grid lines should be drawn to make a curve easier to read for the user.

Trait Implementations

impl Clone for CurveTransform

fn clone(&self) -> CurveTransform

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CurveTransform

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for CurveTransform

fn default() -> CurveTransform

Returns the “default value” for a type.