//-----------------------------------------------------------------------------
// pick() -- Perform for select/pick operation; returns the selected (picked)
// graphic or zero(0) if nothing was selected.
//
// 1) When item == 0, returns nearest (by depth buffer) selected entry.
// 2) When item < 0, returns furthest (by depth buffer) selected entry.
// 3) When item > 0, returns the item'th selected entry or the first entry if
// there are less than 'item' entries
// 4) Returns zero(0) when there are no entries in the select buffer or if the
// Graphic for the select ID is not found.
//-----------------------------------------------------------------------------
BasicGL::Graphic* GlutDisplay::pick(const int item)
{
GLint viewport[4];
glGetIntegerv(GL_VIEWPORT,viewport);
// make sure we are starting at 0, 0
int xm = 0, ym = 0;
getMouse(&xm,&ym);
int x = xm;
int y = viewport[3] - ym;
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluPickMatrix(x, y, getPickWidth(), getPickHeight(), viewport);
// Get our ortho parameters
GLdouble oLeft(0), oRight(0), oBottom(0), oTop(0), oNear(0), oFar(0);
getOrtho(oLeft, oRight, oBottom, oTop, oNear, oFar);
glOrtho(oLeft, oRight, oBottom, oTop, oNear, oFar);
glMatrixMode(GL_MODELVIEW);
if (getDisplayOrientation() != NORMAL) {
glPushMatrix();
if (getDisplayOrientation() == CW90)
glRotated(-90.0, 0.0, 0.0, 1.0);
else if (getDisplayOrientation() == CCW90)
glRotated(90.0, 0.0, 0.0, 1.0);
else
glRotated(180.0, 0.0, 0.0, 1.0);
}
static const unsigned int MAX_BUFF_SIZE = 1024;
GLuint sbuff[MAX_BUFF_SIZE];
clearSelectBuffer(sbuff,MAX_BUFF_SIZE);
glSelectBuffer(MAX_BUFF_SIZE, sbuff);
glRenderMode(GL_SELECT);
glInitNames();
draw();
GLint hits = glRenderMode(GL_RENDER);
if (getDisplayOrientation() != NORMAL) glPopMatrix();
Graphic* selected = findSelected(hits, sbuff, item);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
return selected;
}
BasicGL::Graphic* FoxDisplay::pick(const int mouseX, const int mouseY, const int item)
{
GLint viewport[4];
// get our canvas and make it current
getCanvas()->makeCurrent();
//glGetIntegerv(GL_VIEWPORT,viewport);
getViewport(&viewport[0], &viewport[1], &viewport[2], &viewport[3]);
int x = mouseX;
int y = mouseY;
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluPickMatrix(x, y, 10, 10, viewport);
GLdouble tl = 0, tr = 0, tb = 0, tt = 0, tn = 0, tf = 0;
getOrtho(tl, tr, tb, tt, tn, tf);
glOrtho(tl, tr, tb, tt, tn, tf);
//std::cout << "viewport is " << viewport[2] << " " << viewport[3] << std::endl;
glMatrixMode(GL_MODELVIEW);
GLuint sbuff[100];
clearSelectBuffer(sbuff,100);
glSelectBuffer(100, sbuff);
glRenderMode(GL_SELECT);
draw();
glRenderMode(GL_RENDER);
printSelectBuffer(sbuff,100);
Graphic* selected = findSelected(sbuff,100,item);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
getCanvas()->makeNonCurrent();
return selected;
}