Command for drawing a circle. More...

#include <commands.hpp>

Collaboration diagram for epaper::CircleCommand:

Public Member Functions
constexpr	CircleCommand (Point ctr, std::size_t r, Color c=Color::Black, DotPixel w=DotPixel::Pixel1x1, DrawFill f=DrawFill::Empty) noexcept
	Construct a circle command with specified parameters.

Public Attributes
Point	center
	Center point.

std::size_t	radius
	Circle radius in pixels.

Color	color
	Circle color.

DotPixel	border_width
	Border width.

DrawFill	fill
	Fill mode (empty/full)

Detailed Description

Command for drawing a circle.

Encapsulates all parameters needed to draw a circle using midpoint algorithm. Constructed via CircleBuilder.

Member Semantics:

center: Circle center point in logical coordinates
radius: Circle radius in pixels (always positive)
color: Circle color (border and fill use same color)
border_width: Thickness of circle outline (currently unimplemented - always 1px)
fill: Empty (outline only) or Full (solid fill)

Algorithm:

Midpoint circle algorithm (Bresenham's circle) - integer-only, no FPU
Draws one octant, mirrors to remaining 7 using symmetry
Fill implemented as horizontal scan lines between symmetric points

Coordinate Clipping:

No bounds checking at construction - circles may extend beyond display edges
Framebuffer set_pixel() performs clipping during rendering

See also: CircleBuilder, Graphics::draw_circle()

Constructor & Destructor Documentation

◆ CircleCommand()

constexpr epaper::CircleCommand::CircleCommand	(	Point	ctr,
		std::size_t	r,
		Color	c = `Color::Black`,
		DotPixel	w = `DotPixel::Pixel1x1`,
		DrawFill	f = `DrawFill::Empty`
	)

inlineconstexprnoexcept

Construct a circle command with specified parameters.

Parameters

ctr	Center point
r	Circle radius
c	Circle color (default: Black)
w	Border width (default: 1x1)
f	Fill mode (default: Empty)

Member Data Documentation

◆ border_width

DotPixel epaper::CircleCommand::border_width

Border width.

Examples: /mnt/nas/libepaper/include/epaper/draw/commands.hpp.

◆ center

Point epaper::CircleCommand::center

Center point.

Examples: /mnt/nas/libepaper/include/epaper/draw/commands.hpp.

◆ color

Color epaper::CircleCommand::color

Circle color.

Examples: /mnt/nas/libepaper/include/epaper/draw/commands.hpp.

◆ fill

DrawFill epaper::CircleCommand::fill

Fill mode (empty/full)

Examples: /mnt/nas/libepaper/include/epaper/draw/commands.hpp.

◆ radius

std::size_t epaper::CircleCommand::radius

Circle radius in pixels.

Examples: /mnt/nas/libepaper/include/epaper/draw/commands.hpp.

The documentation for this struct was generated from the following file:

include/epaper/draw/commands.hpp

Public Member Functions

Public Attributes