#include <graphics.hpp>

Static Public Member Functions
template<FramebufferLike FB>
static auto	draw_line (FB &fb, Point start, Point end, LineStyle style, Color color, Orientation orientation) -> void
	Draw a line on the framebuffer.

template<FramebufferLike FB>
static auto	draw_rectangle (FB &fb, Point top_left, Point bottom_right, LineStyle style, Color color, DrawFill fill, Orientation orientation) -> void
	Draw a rectangle on the framebuffer.

template<FramebufferLike FB>
static auto	draw_circle (FB &fb, Point center, std::size_t radius, LineStyle style, Color color, DrawFill fill, Orientation orientation) -> void
	Draw a circle on the framebuffer.

template<FramebufferLike FB>
static auto	draw_text (FB &fb, Point pos, std::string_view text, const Font &font, Color foreground, Color background, Orientation orientation) -> void
	Draw text string on the framebuffer.

template<FramebufferLike FB>
static auto	draw_bitmap (FB &fb, Point pos, std::span< const std::uint8_t > data, std::size_t w, std::size_t h, std::size_t target_w, std::size_t target_h, Orientation orientation) -> void
	Draw a bitmap on the framebuffer.

Member Function Documentation

◆ draw_bitmap()

template<FramebufferLike FB>

auto epaper::Graphics::draw_bitmap	(	FB &	fb,
		Point	pos,
		std::span< const std::uint8_t >	data,
		std::size_t	w,
		std::size_t	h,
		std::size_t	target_w,
		std::size_t	target_h,
		Orientation	orientation
	)		-> void

static

Draw a bitmap on the framebuffer.

Template Parameters

FB	FramebufferLike type

Parameters

fb	Target framebuffer
pos	Top-left position
data	Raw bitmap data
w	Source width
h	Source height
target_w	Target width (scaling)
target_h	Target height (scaling)
orientation	Coordinate orientation

Examples: /mnt/nas/libepaper/include/epaper/core/display.hpp, and /mnt/nas/libepaper/include/epaper/graphics/graphics.hpp.

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◆ draw_circle()

template<FramebufferLike FB>

auto epaper::Graphics::draw_circle	(	FB &	fb,
		Point	center,
		std::size_t	radius,
		LineStyle	style,
		Color	color,
		DrawFill	fill,
		Orientation	orientation
	)		-> void

static

Draw a circle on the framebuffer.

Midpoint circle algorithm (Bresenham's circle).

Template Parameters

FB	FramebufferLike type

Parameters

fb	Target framebuffer
center	Center point
radius	Radius in pixels
style	Border style
color	Circle color
fill	Fill mode
orientation	Coordinate orientation

Efficient integer-only circle drawing using 8-way symmetry. Calculates one octant and mirrors to draw all 8 octants simultaneously.

Algorithm Properties:

No floating point (no trigonometry, no sqrt)
No multiplication in inner loop
8-fold symmetry reduces computations by 87.5%
Incremental error calculation

Octant Symmetry: Computing (x, y) for one octant gives 8 points: (±x, ±y) and (±y, ±x)

Fill Implementation: For filled circles, draws horizontal scan lines between symmetric points in each octant, creating solid interior.

Reference: Derived from Bresenham's line algorithm, adapted for circles.

Examples: /mnt/nas/libepaper/include/epaper/core/display.hpp, and /mnt/nas/libepaper/include/epaper/graphics/graphics.hpp.

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◆ draw_line()

template<FramebufferLike FB>

auto epaper::Graphics::draw_line	(	FB &	fb,
		Point	start,
		Point	end,
		LineStyle	style,
		Color	color,
		Orientation	orientation
	)		-> void

static

Draw a line on the framebuffer.

Bresenham's line algorithm implementation.

Template Parameters

FB	FramebufferLike type

Parameters

fb	Target framebuffer
start	Start point
end	End point
style	Line style (Solid, Dotted, etc.)
color	Line color
orientation	Coordinate orientation

Classic integer-only line drawing algorithm. Efficiently determines which pixels to illuminate on a raster display to approximate a straight line between two points.

Algorithm Properties:

No floating point arithmetic required
No division in inner loop (only initialization)
Symmetric - same pixels regardless of direction
Works for all octants (0°-360°)

Dotted Line Support:

Alternates pixels on/off based on step count
Pattern: pixel, skip, pixel, skip, ...

Reference: Bresenham, J. E. (1965). "Algorithm for computer control of a digital plotter". IBM Systems Journal. 4 (1): 25–30.

Examples: /mnt/nas/libepaper/include/epaper/core/display.hpp, and /mnt/nas/libepaper/include/epaper/graphics/graphics.hpp.

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◆ draw_rectangle()

template<FramebufferLike FB>

auto epaper::Graphics::draw_rectangle	(	FB &	fb,
		Point	top_left,
		Point	bottom_right,
		LineStyle	style,
		Color	color,
		DrawFill	fill,
		Orientation	orientation
	)		-> void

static

Draw a rectangle on the framebuffer.

Rectangle drawing via edge decomposition.

Template Parameters

FB	FramebufferLike type

Parameters

fb	Target framebuffer
top_left	Top-left corner
bottom_right	Bottom-right corner
style	Border style
color	Rectangle color
fill	Fill mode
orientation	Coordinate orientation

Draws rectangle as 4 separate lines (top, right, bottom, left edges). For filled rectangles, draws horizontal scan lines between left and right edges.

Algorithm:

Draw 4 border lines
If fill requested, draw horizontal lines for interior

Optimization Note: For filled rectangles, could use faster set_pixel loops instead of draw_line, but current approach reuses line drawing logic for consistency.

Examples: /mnt/nas/libepaper/include/epaper/core/display.hpp, and /mnt/nas/libepaper/include/epaper/graphics/graphics.hpp.

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◆ draw_text()

template<FramebufferLike FB>

auto epaper::Graphics::draw_text	(	FB &	fb,
		Point	pos,
		std::string_view	text,
		const Font &	font,
		Color	foreground,
		Color	background,
		Orientation	orientation
	)		-> void

static

Draw text string on the framebuffer.

Template Parameters

FB	FramebufferLike type

Parameters

fb	Target framebuffer
pos	Top-left position of text
text	Text content
font	Font to use
foreground	Text color
background	Background color (Color::None for transparent)
orientation	Coordinate orientation

Examples: /mnt/nas/libepaper/include/epaper/core/display.hpp, and /mnt/nas/libepaper/include/epaper/graphics/graphics.hpp.

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

include/epaper/graphics/graphics.hpp

Static Public Member Functions

Member Function Documentation

◆ draw_bitmap()

◆ draw_circle()

◆ draw_line()

◆ draw_rectangle()

◆ draw_text()