void SelectObject(int x, int y)
{
static unsigned int aSelectBuffer[SELECT_BUF_SIZE];
static unsigned int uiHits;
static int aViewport[4];
glGetIntegerv(GL_VIEWPORT, aViewport);
glSelectBuffer(SELECT_BUF_SIZE, aSelectBuffer);
glRenderMode(GL_SELECT);
glInitNames();
glPushName(0);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
// 5x5 Region
gluPickMatrix((double)x, (double)(aViewport[3] - y), 5.0, 5.0, aViewport);
// Same Clipping Window as in Reshape()
GLfloat fAspect = (GLfloat)width / (GLfloat)height;
gluPerspective(60.0f, fAspect, 1.0f, nRange * 2);
gluLookAt(0.f, 0.f, -nRange, 0.f, 0.f, 0.f, 0, 1, 0);
glMatrixMode(GL_MODELVIEW);
Draw(GL_SELECT);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
uiHits = glRenderMode(GL_RENDER);
ProcessHits(uiHits, aSelectBuffer);
glMatrixMode(GL_MODELVIEW);
glutPostRedisplay();
}
/*-----------------------------------------------------------------------------
* Mouse
* Handles Mouse Movement and Selection
*-----------------------------------------------------------------------------*/
void Mouse(int button, int state, int x, int y)
{
GLuint nameBuffer[BUF_SIZ];
GLint hits;
GLint viewport[4];
if(levelComplete == TRUE)
return;
if((button == GLUT_LEFT_BUTTON) && (state == GLUT_DOWN))
{
/* Get the Viewport and set to Projection */
glGetIntegerv( GL_VIEWPORT, viewport );
glMatrixMode( GL_PROJECTION );
/* Save the Projection matrix */
glPushMatrix( );
glLoadIdentity( );
gluPickMatrix( (GLdouble)x, (GLdouble)(viewport[3] - y),
N, N, viewport );
gluOrtho2D( xmin, xmax, ymin, ymax );
/* Set the Render Mode to the Selection mode */
glMatrixMode( GL_MODELVIEW );
glSelectBuffer(BUF_SIZ, nameBuffer);
glRenderMode( GL_SELECT );
/* Initialize the Object Naming */
glInitNames( );
glPushName( 0 );
/* Draw the Shapes with Select enabled */
Draw( );
/* Reset the Projection Matrix */
glMatrixMode( GL_PROJECTION );
glPopMatrix( );
/* Return drawing to MODELVIEW */
glMatrixMode( GL_MODELVIEW );
/* Get the number of hits */
hits = glRenderMode( GL_RENDER );
ProcessHits( hits, nameBuffer );
/* Call a movement */
MouseMove( x, y );
/* Draw the display */
glutPostRedisplay( );
}
else if((button == GLUT_LEFT_BUTTON) && (state == GLUT_UP))
{
if(selectedNode != NULL)
{
TransformList* from = NULL;
TransformList* to = NULL;
/* Check if its in the dimension */
if(((selectedIndex / SELECTED) == 1) && (lastX > 100.0) && (lastY > -100))
{
from = &tlSelectedTransforms;
to = &tlAvailableTransforms;
selectedList = &tlAvailableTransforms;
}
else if(((selectedIndex / AVAILABLE) == 1) && (lastY < -100) && (lastX < 100.0))
{
from = &tlAvailableTransforms;
to = &tlSelectedTransforms;
selectedList = &tlSelectedTransforms;
}
if((from != NULL) && (to != NULL))
{
/* Swap the nodes */
RemoveNode(from, selectedNode);
AppendNode(to, selectedNode);
}
/* Reset the mouse display */
selectedIndex = 0;
/* Set the new position */
glutPostRedisplay( );
}
}
}
