Display content renderering

Display content rendering. More...

Data Structures
struct	renderer_t
	An object that returns frames indefinitely. More...

String grid distance
uint8_t	get_string_distance (uint8_t x, uint8_t y)
	Calculate the distance between strings x and y (zero-indexed) More...
#define	get_string_distance_to_centre(string)   get_string_distance((string), 35);

Detailed Description

Display content rendering.

For stand-alone operation an device testing, a frame renderer interface was developed. Depending on the device state, one renderer is selected and used to generate frames that are pushed into the frame queue. Every time a frame is consumed, the current renderer's renderer_t::render_frame() function is called to generate the next frame.

See also

Remote rendering

Macro Definition Documentation

get_string_distance_to_centre

#define get_string_distance_to_centre

(

string

)

get_string_distance((string), 35);

Calculate the distance between a strings (zero-indexed) and the center of the array (string 36). This is equivalent to calling get_string_distance(string, 35).

Function Documentation

get_string_distance()

uint8_t get_string_distance	(	uint8_t	x,
		uint8_t	y
	)

Calculate the distance between strings x and y (zero-indexed)

A hexagonal lattice may be constructed from a regular, 3D square grid by taking the plane satisfying the eqaution \(x+y+z=0\). If the pair \((x,y)\) is mapped onto a 2D space given by \((v,w)\), this plane equation determines \(z\). The distance \(D\) between 2 points on a hexagonal grid is given by

\begin{eqnarray*} D &=& 0.5 (|x_1-x_2| + |y_1-y_2| + |z_1-z_2|) \\ &=& 0.5 (|v_1-v_2| + |w_1-w_2| + |(v_1-v_2)-(w_1-w_2)|) \end{eqnarray*}

See also

Extensive explanation at: http://www.redblobgames.com/grids/hexagons/