_CrossHairInfo Struct Reference

Structure to hold cross hair information. More...

Data Fields
short	majorVersion
short	minorVersion
int	w
int	h
void *	privatedata
void *	userdata
void(*	drawLine )(CrossHairInfo *dt, int x1, int y1, int x2, int y2, int colorindex)
void(*	drawLozenge )(CrossHairInfo *dt, int x, int y, int w, int h, int colorindex)
void(*	getMouseState )(CrossHairInfo *dt, int *x, int *y, int *state)

Detailed Description

Structure to hold cross hair information.

Structure to hold cross hair information that are needed to draw the cross hair on camera images.

Field Documentation

void(* drawLine) (CrossHairInfo *dt, int x1, int y1, int x2, int y2, int colorindex)

drawLine should draw a line from (x1,y1) -> (x2,y2) with the given color

Parameters

[in]

x1

void(* drawLozenge) (CrossHairInfo *dt, int x, int y, int w, int h, int colorindex)

drawLozenge should draw circle if the width and height are equal. otherwise find the smallest width and draw semi-circles on the longest side at both ends and connect the semi circles with lines.

void(* getMouseState) (CrossHairInfo *dt, int *x, int *y, int *state)

getMouseState should fill values for (x,y) with current mouse position and the state = 1 if pressed. the x and y values are respective to top left hand corner of the image

int h

Display height of the camera image. This need not to match the size given at setup_image_display_hook

short majorVersion

for the moment this should be set to 1.

short minorVersion

for the moment this should be set to 0.

void* privatedata

Private data used by internals of eyelink_draw_cross_hair. This pointer should not be touched externally

void* userdata

Attribute to hold any user data. Any data set here untouched by eyelink_draw_cross_hair.

int w

Display width of the camera image. This need not to match the size given at setup_image_display_hook