Struct agg::raster::RasterizerScanline

pub struct RasterizerScanline {
    pub clipper: Clip,
    pub outline: RasterizerCell,
    pub status: PathStatus,
    pub x0: i64,
    pub y0: i64,
    /* private fields */
}

Rasterizer Anti-Alias using Scanline

Fields

clipper: Clip

Clipping Region

outline: RasterizerCell

Collection of Rasterizing Cells

status: PathStatus

Status of Path

x0: i64

Current x position

y0: i64

Current y position

Implementations

impl RasterizerScanline

pub fn reset(&mut self)

Reset Rasterizer

Reset the RasterizerCell and set PathStatus to Initial

pub fn add_path<VS: VertexSource>(&mut self, path: &VS)

Add a Path

Walks the path from the VertexSource and rasterizes it

pub fn rewind_scanlines(&mut self) -> bool

Rewind the Scanline

Close active polygon, sort the Rasterizer Cells, set the scan_y value to the minimum y value and return if any cells are present

pub fn min_x(&self) -> i64

Return minimum x value from the RasterizerCell

pub fn max_x(&self) -> i64

Return maximum x value from the RasterizerCell

impl RasterizerScanline

pub fn new() -> Self

Create a new RasterizerScanline

pub fn gamma<F>(&mut self, gfunc: F)where
    F: Fn(f64) -> f64,

Set the gamma function

Values are set as:

      gamma = gfunc( v / mask ) * mask

where v = 0 to 255

pub fn new_with_gamma<F>(gfunc: F) -> Selfwhere
    F: Fn(f64) -> f64,

Create a new RasterizerScanline with a gamma function

See gamma() function for description

pub fn clip_box(&mut self, x1: f64, y1: f64, x2: f64, y2: f64)

Set Clip Box

pub fn move_to_d(&mut self, x: f64, y: f64)

Move to point (x,y)

Sets point as the initial point

pub fn line_to_d(&mut self, x: f64, y: f64)

Draw line from previous point to point (x,y)

pub fn close_polygon(&mut self)

Close the current polygon

Draw a line from current point to initial “move to” point

pub fn calculate_alpha(&self, area: i64) -> u64

Calculate alpha term based on area

Trait Implementations

impl Debug for RasterizerScanline

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

Formats the value using the given formatter.

impl Default for RasterizerScanline

fn default() -> RasterizerScanline

Returns the “default value” for a type.