Coordinate Mapping Functions
[Canvas Functions]
Functions that are used to map coordinates from the canvas to the screen or the screen to the canvas. More...
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);