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#include "pan.h"
#include "../../util/check_error.h"
#include "../../view/state0.h"
#include <GL/glut.h>
#define S state0
void
pan (int x1, int y1, int x2, int y2)
{
int dx = x1 - x2;
int dy = y1 - x2;
if (dx == 0 && dy == 0)
return;
/*
* Convert the selection boundary from window coordinates to
* world coordinates.
*/
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
GLdouble model[16];
glGetDoublev (GL_MODELVIEW_MATRIX, model);
GLdouble projection[16];
glGetDoublev (GL_PROJECTION_MATRIX, projection);
GLint viewport[4];
glGetIntegerv (GL_VIEWPORT, viewport);
check_error (__FILE__, __LINE__);
GLdouble start_position[3];
gluUnProject (x1,
y1,
0,
model,
projection,
viewport,
&start_position[0], &start_position[1], &start_position[2]);
check_error (__FILE__, __LINE__);
GLdouble end_position[3];
gluUnProject (x2,
y2,
0,
model,
projection,
viewport,
&end_position[0], &end_position[1], &end_position[2]);
check_error (__FILE__, __LINE__);
S.pan.trans[0] += end_position[0] - start_position[0];
S.pan.trans[1] -= end_position[1] - start_position[1];
glutPostRedisplay ();
return;
}
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