ra8_touch_cal_matrix_t Struct Reference

2-D affine transform screen = [a b; d e] * raw + [c; f]. More...

#include <ra8_touch_cal.h>

Data Fields
float	a
	Row 0, column 0: raw-X gain on screen-X.
float	b
	Row 0, column 1: raw-Y gain on screen-X.
float	c
	Row 0 offset: screen-X bias.
float	d
	Row 1, column 0: raw-X gain on screen-Y.
float	e
	Row 1, column 1: raw-Y gain on screen-Y.
float	f
	Row 1 offset: screen-Y bias.

Detailed Description

2-D affine transform screen = [a b; d e] * raw + [c; f].

The six floats are the row-major coefficients of the affine map. The mapping is:

u = a*x + b*y + c v = d*x + e*y + f

where (x, y) is a raw controller sample and (u, v) is the resulting screen pixel.

Invariant

ra8_touch_cal_compute populates all six members or returns an error and leaves the struct untouched.

See also

ra8_touch_cal_compute

ra8_touch_cal_apply

Definition at line 175 of file ra8_touch_cal.h.

Field Documentation

a

float ra8_touch_cal_matrix_t::a

Row 0, column 0: raw-X gain on screen-X.

Definition at line 176 of file ra8_touch_cal.h.

Referenced by ra8_touch_cal_apply(), ra8_touch_cal_compute(), ra8_touch_cal_load(), and ra8_touch_cal_save().

b

float ra8_touch_cal_matrix_t::b

Row 0, column 1: raw-Y gain on screen-X.

Definition at line 177 of file ra8_touch_cal.h.

Referenced by ra8_touch_cal_apply(), ra8_touch_cal_compute(), ra8_touch_cal_load(), and ra8_touch_cal_save().

c

float ra8_touch_cal_matrix_t::c

Row 0 offset: screen-X bias.

Definition at line 178 of file ra8_touch_cal.h.

Referenced by ra8_touch_cal_apply(), ra8_touch_cal_compute(), ra8_touch_cal_load(), and ra8_touch_cal_save().

d

float ra8_touch_cal_matrix_t::d

Row 1, column 0: raw-X gain on screen-Y.

Definition at line 179 of file ra8_touch_cal.h.

Referenced by ra8_touch_cal_apply(), ra8_touch_cal_compute(), ra8_touch_cal_load(), and ra8_touch_cal_save().

e

float ra8_touch_cal_matrix_t::e

Row 1, column 1: raw-Y gain on screen-Y.

Definition at line 180 of file ra8_touch_cal.h.

Referenced by ra8_touch_cal_apply(), ra8_touch_cal_compute(), ra8_touch_cal_load(), and ra8_touch_cal_save().

f

float ra8_touch_cal_matrix_t::f

Row 1 offset: screen-Y bias.

Definition at line 181 of file ra8_touch_cal.h.

Referenced by ra8_touch_cal_apply(), ra8_touch_cal_compute(), ra8_touch_cal_load(), and ra8_touch_cal_save().

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

• libs/ra8_touch_cal/inc/ra8_touch_cal.h