Evas_Coord_Mapping_Group (3) - Linux Manuals

Evas_Coord_Mapping_Group: Functions that are used to map coordinates from the canvas to the screen or the screen to the canvas.

NAME

Evas Coordinate Mapping Functions - Functions that are used to map coordinates from the canvas to the screen or the screen to the canvas.

Functions

EAPI Evas_Coord evas_coord_screen_x_to_world (const Evas *e, int x)
Convert/scale an ouput screen co-ordinate into canvas co-ordinates.
EAPI Evas_Coord evas_coord_screen_y_to_world (const Evas *e, int y)
Convert/scale an ouput screen co-ordinate into canvas co-ordinates.
EAPI int evas_coord_world_x_to_screen (const Evas *e, Evas_Coord x)
Convert/scale a canvas co-ordinate into output screen co-ordinates.
EAPI int evas_coord_world_y_to_screen (const Evas *e, Evas_Coord y)
Convert/scale a canvas co-ordinate into output screen co-ordinates.

Detailed Description

Functions that are used to map coordinates from the canvas to the screen or the screen to the canvas.

Function Documentation

EAPI Evas_Coord evas_coord_screen_x_to_world (const Evas * e, int x)

Convert/scale an ouput screen co-ordinate into canvas co-ordinates.

Parameters:

e The pointer to the Evas Canvas
x The screen/output x co-ordinate

Returns:

The screen co-ordinate translated to canvas unit co-ordinates

This function takes in a horizontal co-ordinate as the x parameter and converts it into canvas units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Example:

 extern Evas *evas;
 extern int screen_x;
 Evas_Coord canvas_x;

 canvas_x = evas_coord_screen_x_to_world(evas, screen_x);

EAPI Evas_Coord evas_coord_screen_y_to_world (const Evas * e, int y)

Convert/scale an ouput screen co-ordinate into canvas co-ordinates.

Parameters:

e The pointer to the Evas Canvas
y The screen/output y co-ordinate

Returns:

The screen co-ordinate translated to canvas unit co-ordinates

This function takes in a vertical co-ordinate as the y parameter and converts it into canvas units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Example:

 extern Evas *evas;
 extern int screen_y;
 Evas_Coord canvas_y;

 canvas_y = evas_coord_screen_y_to_world(evas, screen_y);

EAPI int evas_coord_world_x_to_screen (const Evas * e, Evas_Coord x)

Convert/scale a canvas co-ordinate into output screen co-ordinates.

Parameters:

e The pointer to the Evas Canvas
x The canvas x co-ordinate

Returns:

The output/screen co-ordinate translated to output co-ordinates

This function takes in a horizontal co-ordinate as the x parameter and converts it into output units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Example:

 extern Evas *evas;
 int screen_x;
 extern Evas_Coord canvas_x;

 screen_x = evas_coord_world_x_to_screen(evas, canvas_x);

EAPI int evas_coord_world_y_to_screen (const Evas * e, Evas_Coord y)

Convert/scale a canvas co-ordinate into output screen co-ordinates.

Parameters:

e The pointer to the Evas Canvas
y The canvas y co-ordinate

Returns:

The output/screen co-ordinate translated to output co-ordinates

This function takes in a vertical co-ordinate as the x parameter and converts it into output units, accounting for output size, viewport size and location, returning it as the function return value. If e is invalid, the results are undefined.

Example:

 extern Evas *evas;
 int screen_y;
 extern Evas_Coord canvas_y;

 screen_y = evas_coord_world_y_to_screen(evas, canvas_y);

Author

Generated automatically by Doxygen for Evas from the source code.