struct Canvas {
    width: usize,
    height: usize,
    buffer: Vec<Pixel>,
}
Expand description

Canvas which is used for simple line drawing operations.

The coordinate system is the following:

0 x –––––––→ | | | | | | y↓

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§width: usize

Canvas width.

§height: usize

Canvas height.

§buffer: Vec<Pixel>

Canvas buffer we draw on.

Implementations§

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impl Canvas

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fn new(width: usize, height: usize) -> Self

Builds new Canvas for line drawing with the given width and height with default color.

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fn y_center(&self) -> f32

Vertical center of the Canvas.

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fn x_center(&self) -> f32

Horizontal center of the Canvas.

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fn buffer_mut(&mut self) -> &mut [Pixel]

Canvas underlying buffer for direct manipulation

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fn h_line_bounds(&self, y: f32, stroke_size: usize) -> (f32, f32)

Gives bounds for horizontal straight line on y with stroke_size.

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fn v_line_bounds(&self, x: f32, stroke_size: usize) -> (f32, f32)

Gives bounds for vertical straight line on y with stroke_size.

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fn flip_horizontal(&mut self)

Flip horizontally.

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fn draw_h_line(&mut self, x: f32, y: f32, size: f32, stroke_size: usize)

Draws a horizontal straight line from (x, y) of size with the given stroke_size.

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fn draw_v_line(&mut self, x: f32, y: f32, size: f32, stroke_size: usize)

Draws a vertical straight line from (x, y) of size with the given stroke_size.

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fn draw_rect(&mut self, x: f32, y: f32, width: f32, height: f32, color: Pixel)

Draws a rect from the (x, y) of the given width and height using color.

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fn put_pixel(&mut self, x: f32, y: f32, color: Pixel)

Put pixel into buffer with the given color if the color is brighter than the one buffer already has in place.

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fn draw_line(&mut self, from_x: f32, from_y: f32, to_x: f32, to_y: f32)

Xiaolin Wu’s line drawing from (from_x, from_y) to (to_x, to_y).

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fn draw_ellipse_arc(&mut self, stroke_size: usize)

Draws a part of an ellipse centered in (0., 0.) with self.x_center() and self.y_center vertex and co-vertex respectively using a given stroke in the bottom-right quadrant of the Canvas coordinate system.

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fn fill(&mut self, color: Pixel)

Fills the Canvas with the given Color.

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fn into_raw(self) -> Vec<u8>

Consumes Canvas and returns its underlying storage as raw byte vector.

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