An encapsulation of window-viewport primitives for 2D graphics with OpenGL. More...
#include <Robots/LoBot/ui/LoGLCanvas.H>
Classes | |
| class | Params |
Public Member Functions | |
| GLCanvas () | |
| Initialization. | |
| void | set_viewport (int left, int right, int bottom, int top) |
| void | get_viewport (int *x, int *y, int *width, int *height) |
| Retrieve the current GL viewport in effect. | |
| void | screen_to_world (int screen_x, int screen_y, double *world_x, double *world_y) |
| Convert screen coordinates to world coordinates. | |
| void | zoom_to (float zoom_level) |
| void | zoom_by (float delta) |
| Zoom the scene by the specified amount. | |
| float | zoom_level () const |
| Return the current zoom level. | |
| void | pan (float dx, float dy) |
| Pan the scene by the specified amount. | |
| void | reset_zoom_pan () |
| Reset the zoom and pan parameters. | |
| ~GLCanvas () | |
| Clean-up. | |
| void | set_window (float left, float right, float bottom, float top) |
| This method sets up the world coordinate system. | |
| void | set_window (const float window[]) |
|
| |
| enum | { LEFT, RIGHT, BOTTOM, TOP } |
An encapsulation of window-viewport primitives for 2D graphics with OpenGL.
This class implements some window and viewport operations for doing 2D graphics with OpenGL. Supported operations include zoom and pan.
Definition at line 69 of file LoGLCanvas.H.
| anonymous enum |
The main purpose of this canvas class is to encapsulate the window and viewport transformations for 2D graphics. These member variables take care of holding the current values of these parameters.
Definition at line 76 of file LoGLCanvas.H.
| lobot::GLCanvas::GLCanvas | ( | ) |
Initialization.
Definition at line 90 of file LoGLCanvas.C.
| lobot::GLCanvas::~GLCanvas | ( | ) |
Clean-up.
Definition at line 238 of file LoGLCanvas.C.
| void lobot::GLCanvas::get_viewport | ( | int * | x, | |
| int * | y, | |||
| int * | width, | |||
| int * | height | |||
| ) |
Retrieve the current GL viewport in effect.
Definition at line 154 of file LoGLCanvas.C.
| void lobot::GLCanvas::pan | ( | float | dx, | |
| float | dy | |||
| ) |
Pan the scene by the specified amount.
Definition at line 219 of file LoGLCanvas.C.
References set_window().
Referenced by reset_zoom_pan().
| void lobot::GLCanvas::reset_zoom_pan | ( | ) |
Reset the zoom and pan parameters.
Definition at line 229 of file LoGLCanvas.C.
| void lobot::GLCanvas::screen_to_world | ( | int | screen_x, | |
| int | screen_y, | |||
| double * | world_x, | |||
| double * | world_y | |||
| ) |
Convert screen coordinates to world coordinates.
Definition at line 166 of file LoGLCanvas.C.
| void lobot::GLCanvas::set_viewport | ( | int | left, | |
| int | right, | |||
| int | bottom, | |||
| int | top | |||
| ) |
This method sets up the graphics viewport with an aspect ratio matching that of the world coordinate system.
Definition at line 123 of file LoGLCanvas.C.
References R.
| void lobot::GLCanvas::set_window | ( | float | left, | |
| float | right, | |||
| float | bottom, | |||
| float | top | |||
| ) |
This method sets up the world coordinate system.
Definition at line 107 of file LoGLCanvas.C.
| void lobot::GLCanvas::zoom_by | ( | float | delta | ) | [inline] |
Zoom the scene by the specified amount.
Definition at line 115 of file LoGLCanvas.H.
References zoom_to().
| float lobot::GLCanvas::zoom_level | ( | ) | const [inline] |
Return the current zoom level.
Definition at line 118 of file LoGLCanvas.H.
| void lobot::GLCanvas::zoom_to | ( | float | zoom_level | ) |
Zoom the scene contained within the canvas to the specified zoom level.
Definition at line 187 of file LoGLCanvas.C.
References abs(), and set_window().
Referenced by reset_zoom_pan(), and zoom_by().
1.6.3