Struct Canvas 

pub struct Canvas<'a> {
    pub w: i32,
    pub h: i32,
    /* private fields */
}

Fields

w: i32

h: i32

Implementations

impl<'a> Canvas<'a>

pub fn new(px: &'a mut [u32], w: i32, h: i32) -> Self

Wrap a pixel buffer. px.len() must equal w * h.

pub fn fill_rect(&mut self, rect: Rect, color: Color)

pub fn dim_rect(&mut self, rect: Rect, strength: u32)

Darken already-drawn pixels inside rect to strength/256 of their brightness — a backdrop panel without an alpha channel. 0 blacks out, 256 leaves the pixels untouched.

pub fn draw_rect_outline(&mut self, rect: Rect, color: Color, thickness: i32)

pub fn fill_circle(&mut self, cx: i32, cy: i32, r: i32, color: Color)

pub fn draw_circle_outline( &mut self, cx: i32, cy: i32, r: i32, color: Color, thickness: i32, )

pub fn draw_text( &mut self, x: i32, y: i32, text: &str, color: Color, scale: i32, )

Draw text with the embedded font, top-left of the line box at (x, y). scale multiplies the base text size — pass the monitor’s DPI scale so text is the same visual size on any display.

pub fn draw_shape_rotated( &mut self, shape: &Shape, deg: i32, color: Color, thickness: i32, fill: bool, )

Draw a shape rotated deg about its bbox center. Unrotated shapes and circles take the fast paths; triangles rotate their vertices and reuse the triangle raster; rotated rects raster by inverse-rotating each candidate pixel into the rect’s local space.

pub fn draw_shape( &mut self, shape: &Shape, color: Color, thickness: i32, fill: bool, )

Draw a selection shape as outline or fill.

pub fn draw_segment(&mut self, line: Line, color: Color, thickness: i32)

A bare segment, no end decoration — for lines nobody grabs, like a snap guide. Caps on a short guide read as a box rather than a line, which is the opposite of pointing at something.

pub fn draw_line(&mut self, line: Line, color: Color, thickness: i32)

A measure ruler: the segment plus square end caps, so the two grabbable endpoints are visible against any background.