Struct graphics::context::Context
[−]
[src]
pub struct Context { pub viewport: Option<Viewport>, pub view: Matrix2d, pub transform: Matrix2d, pub draw_state: DrawState, }
Drawing 2d context.
Fields
viewport | Viewport information. |
view | View transformation. |
transform | Current transformation. |
draw_state | Current draw state settings. |
Methods
impl Context
fn new() -> Context
Creates a new drawing context.
fn new_viewport(viewport: Viewport) -> Context
Creates a new context with absolute transform in point coordinates.
This function assumes the default coordinate system being centered with x axis pointing to the right and y axis pointing up.
Returns a drawing context with origin in the upper left corner and x axis pointing to the right and y axis pointing down.
fn abs(w: Scalar, h: Scalar) -> Context
Creates a new drawing context in absolute coordinates.
This function assumes the default coordinate system being centered with x axis pointing to the right and y axis pointing up.
Returns a drawing context with origin in the upper left corner and x axis pointing to the right and y axis pointing down.
fn view(self) -> Self
Moves the current transform to the view coordinate system.
This is usually [0.0, 0.0] in the upper left corner with the x axis pointing to the right and the y axis pointing down.
fn reset(self) -> Self
Moves the current transform to the default coordinate system.
This is usually [0.0, 0.0] in the center with the x axis pointing to the right and the y axis pointing up.
fn store_view(self) -> Self
Stores the current transform as new view.
fn get_view_size(&self) -> Vec2d
Computes the current view size.