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Christophe Geuzaine authoredChristophe Geuzaine authored
drawContext.cpp 34.71 KiB
// Gmsh - Copyright (C) 1997-2016 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// bugs and problems to the public mailing list <gmsh@onelab.info>.
#include <string>
#include <stdio.h>
#include "Gmsh.h"
#include "GmshConfig.h"
#include "GmshMessage.h"
#include "drawContext.h"
#include "Trackball.h"
#include "Context.h"
#include "Numeric.h"
#include "GModel.h"
#include "MElement.h"
#include "PView.h"
#include "PViewOptions.h"
#include "VertexArray.h"
#include "StringUtils.h"
#include "OS.h"
#include "gl2ps.h"
#if defined(HAVE_FLTK)
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/gl.h>
#include "openglWindow.h"
#endif
#if defined(HAVE_POPPLER)
#include "gmshPopplerWrapper.h"
#endif
drawContextGlobal *drawContext::_global = 0;
extern SPoint2 getGraph2dDataPointForTag(unsigned int);
drawContext::drawContext(openglWindow *window, drawTransform *transform)
: _transform(transform), _openglWindow(window)
{
// initialize from temp values in global context
for(int i = 0; i < 3; i++){
r[i] = CTX::instance()->tmpRotation[i];
t[i] = CTX::instance()->tmpTranslation[i];
s[i] = CTX::instance()->tmpScale[i];
}
for(int i = 0; i < 4; i++){
quaternion[i] = CTX::instance()->tmpQuaternion[i];
}
viewport[0] = viewport[1] = 0;
viewport[2] = CTX::instance()->glSize[0];
viewport[3] = CTX::instance()->glSize[1];
render_mode = GMSH_RENDER;
vxmin = vymin = vxmax = vymax = 0.;
pixel_equiv_x = pixel_equiv_y = 0.;
_bgImageTexture = _bgImageW = _bgImageH = 0;
_quadric = 0; // cannot create it here: needs valid opengl context
_displayLists = 0;
}
drawContext::~drawContext()
{
invalidateQuadricsAndDisplayLists();
}
bool drawContext::isHighResolution(){
// this must be dynamic: the high resolution can change when a window is moved
// across displays
#if defined(HAVE_FLTK)
if(_openglWindow) return _openglWindow->pixel_w() > _openglWindow->w();
#endif
return false;
}
drawContextGlobal *drawContext::global()
{
if(!_global) _global = new drawContextGlobal(); // create dummy default
return _global;
}
void drawContext::invalidateQuadricsAndDisplayLists()
{
if(_quadric){ gluDeleteQuadric(_quadric); _quadric = 0; }
if(_displayLists){ glDeleteLists(_displayLists, 3); _displayLists = 0; }
}
void drawContext::createQuadricsAndDisplayLists()
{
if(!_quadric) _quadric = gluNewQuadric();
if(!_quadric){
Msg::Error("Could not create quadric");
return;
}
if(!_displayLists) _displayLists = glGenLists(3);
if(!_displayLists){
Msg::Error("Could not generate display lists");
return;
}
// display list 0 (sphere)
glNewList(_displayLists + 0, GL_COMPILE);
gluSphere(_quadric, 1.,
CTX::instance()->quadricSubdivisions,
CTX::instance()->quadricSubdivisions);
glEndList();
// display list 1 (arrow)
glNewList(_displayLists + 1, GL_COMPILE);
glTranslated(0., 0., CTX::instance()->arrowRelStemLength);
if(CTX::instance()->arrowRelHeadRadius > 0 &&
CTX::instance()->arrowRelStemLength < 1)
gluCylinder(_quadric, CTX::instance()->arrowRelHeadRadius, 0.,
(1. - CTX::instance()->arrowRelStemLength),
CTX::instance()->quadricSubdivisions, 1);
if(CTX::instance()->arrowRelHeadRadius > CTX::instance()->arrowRelStemRadius)
gluDisk(_quadric, CTX::instance()->arrowRelStemRadius,
CTX::instance()->arrowRelHeadRadius,
CTX::instance()->quadricSubdivisions, 1);
else
gluDisk(_quadric, CTX::instance()->arrowRelHeadRadius,
CTX::instance()->arrowRelStemRadius,
CTX::instance()->quadricSubdivisions, 1);
glTranslated(0., 0., -CTX::instance()->arrowRelStemLength);
if(CTX::instance()->arrowRelStemRadius > 0 &&
CTX::instance()->arrowRelStemLength > 0){
gluCylinder(_quadric, CTX::instance()->arrowRelStemRadius,
CTX::instance()->arrowRelStemRadius,
CTX::instance()->arrowRelStemLength,
CTX::instance()->quadricSubdivisions, 1);
gluDisk(_quadric, 0, CTX::instance()->arrowRelStemRadius,
CTX::instance()->quadricSubdivisions, 1);
}
glEndList();
// display list 2 (disk)
glNewList(_displayLists + 2, GL_COMPILE);
gluDisk(_quadric, 0, 1, CTX::instance()->quadricSubdivisions, 1);
glEndList();
}
void drawContext::buildRotationMatrix()
{
if(CTX::instance()->useTrackball) {
build_rotmatrix(rot, quaternion);
setEulerAnglesFromRotationMatrix();
}
else {
double x = r[0] * M_PI / 180.;
double y = r[1] * M_PI / 180.;
double z = r[2] * M_PI / 180.;
double A = cos(x);
double B = sin(x);
double C = cos(y);
double D = sin(y);
double E = cos(z);
double F = sin(z);
double AD = A * D;
double BD = B * D;
rot[0] = C*E; rot[1] = BD*E+A*F; rot[2] =-AD*E+B*F; rot[3] = 0.;
rot[4] =-C*F; rot[5] =-BD*F+A*E; rot[6] = AD*F+B*E; rot[7] = 0.;
rot[8] = D; rot[9] =-B*C; rot[10] = A*C; rot[11] = 0.;
rot[12] = 0.; rot[13] = 0.; rot[14] = 0.; rot[15] = 1.;
setQuaternionFromEulerAngles();
}
}
void drawContext::addQuaternion(double p1x, double p1y, double p2x, double p2y)
{
double quat[4];
trackball(quat, p1x, p1y, p2x, p2y);
add_quats(quat, quaternion, quaternion);
if (CTX::instance()->camera) camera.rotate(quat);
}
void drawContext::addQuaternionFromAxisAndAngle(double axis[3], double angle)
{
double a = angle * M_PI / 180.;
double quat[4];
axis_to_quat(axis, a, quat);
add_quats(quat, quaternion, quaternion);
}
void drawContext::setQuaternion(double q0, double q1, double q2, double q3)
{
quaternion[0] = q0;
quaternion[1] = q1;
quaternion[2] = q2;
quaternion[3] = q3;
}
void drawContext::setQuaternionFromEulerAngles()
{
double x = r[0] * M_PI / 180.;
double y = r[1] * M_PI / 180.;
double z = r[2] * M_PI / 180.;
double xx[3] = {1.,0.,0.};
double yy[3] = {0.,1.,0.};
double zz[3] = {0.,0.,1.};
double q1[4], q2[4], q3[4], tmp[4];
axis_to_quat(xx, -x, q1);
axis_to_quat(yy, -y, q2);
axis_to_quat(zz, -z, q3);
add_quats(q1, q2, tmp);
add_quats(tmp, q3, quaternion);}
void drawContext::setEulerAnglesFromRotationMatrix()
{
r[1] = asin(rot[8]); // Calculate Y-axis angle
double C = cos(r[1]);
r[1] *= 180. / M_PI;
if(fabs(C) > 0.005){ // Gimball lock?
double tmpx = rot[10] / C; // No, so get X-axis angle
double tmpy = -rot[9] / C;
r[0] = atan2(tmpy, tmpx) * 180. / M_PI;
tmpx = rot[0] / C; // Get Z-axis angle
tmpy = -rot[4] / C;
r[2] = atan2(tmpy, tmpx) * 180. / M_PI;
}
else{ // Gimball lock has occurred
r[0] = 0.; // Set X-axis angle to zero
double tmpx = rot[5]; // And calculate Z-axis angle
double tmpy = rot[1];
r[2] = atan2(tmpy, tmpx) * 180. / M_PI;
}
// return only positive angles in [0,360]
if(r[0] < 0.) r[0] += 360.;
if(r[1] < 0.) r[1] += 360.;
if(r[2] < 0.) r[2] += 360.;
}
static int needPolygonOffset()
{
GModel *m = GModel::current();
if(m->getMeshStatus() == 2 &&
(CTX::instance()->mesh.surfacesEdges || CTX::instance()->geom.lines ||
CTX::instance()->geom.surfaces))
return 1;
if(m->getMeshStatus() == 3 &&
(CTX::instance()->mesh.surfacesEdges || CTX::instance()->mesh.volumesEdges))
return 1;
for(unsigned int i = 0; i < PView::list.size(); i++){
PViewOptions *opt = PView::list[i]->getOptions();
if(opt->visible && opt->showElement) return 1;
}
return 0;
}
void drawContext::draw3d()
{
// We can only create this when a valid opengl context exists. (It's cheap to
// create so we just do it at each redraw: this makes it much simpler to deal
// with option changes, e.g. arrow shape changes)
createQuadricsAndDisplayLists();
// We should only enable the polygon offset when there is a mix of lines and
// polygons to be drawn; enabling it all the time can lead to very small but
// annoying artifacts in the picture. Since there are so many ways in Gmsh to
// combine polygons and lines (geometries + meshes + views...), we do our best
// here to automatically detect if we should enable it. Note: the formula for
// the offset is "offset = factor*DZ+r*units", where DZ is a measurement of
// the change in depth relative to the screen area of the polygon, and r is
// the smallest value that is guaranteed to produce a resolvable offset for a
// given implementation.
glPolygonOffset((float)CTX::instance()->polygonOffsetFactor,
(float)CTX::instance()->polygonOffsetUnits);
if(CTX::instance()->polygonOffsetFactor || CTX::instance()->polygonOffsetUnits)
CTX::instance()->polygonOffset = CTX::instance()->polygonOffsetAlways ? 1 :
needPolygonOffset();
else
CTX::instance()->polygonOffset = 0;
// speedup drawing of textured fonts on cocoa mac version
#if defined(HAVE_FLTK) && defined(__APPLE__) int numStrings = GModel::current()->getNumVertices();
if(CTX::instance()->mesh.pointsNum)
numStrings = std::max(numStrings, GModel::current()->getNumMeshVertices());
if(CTX::instance()->mesh.linesNum || CTX::instance()->mesh.surfacesNum ||
CTX::instance()->mesh.volumesNum)
numStrings = std::max(numStrings, GModel::current()->getNumMeshElements());
numStrings *= 2;
// FIXME: restting to 1 each time to workaround bug on recent MacOS versions
gl_texture_pile_height(1);
if(gl_texture_pile_height() < numStrings)
gl_texture_pile_height(numStrings);
#endif
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
initProjection();
initRenderModel();
if(!CTX::instance()->camera) initPosition();
drawAxes();
drawGeom();
drawBackgroundImage(true);
drawMesh();
drawPost();
drawGraph2d(true);
}
void drawContext::draw2d()
{
glDisable(GL_DEPTH_TEST);
for(int i = 0; i < 6; i++)
glDisable((GLenum)(GL_CLIP_PLANE0 + i));
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho((double)viewport[0], (double)viewport[2],
(double)viewport[1], (double)viewport[3],
-100., 100.); // in pixels, so we can draw some 3D glyphs
// hack to make the 2D primitives appear "in front" in GL2PS
glTranslated(0., 0., CTX::instance()->clipFactor > 1. ?
1. / CTX::instance()->clipFactor : CTX::instance()->clipFactor);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
drawGraph2d(false);
drawText2d();
if(CTX::instance()->post.draw && !CTX::instance()->stereo)
drawScales();
if(CTX::instance()->smallAxes)
drawSmallAxes();
}
void drawContext::drawBackgroundGradient()
{
if(CTX::instance()->bgGradient == 1){ // vertical
glBegin(GL_QUADS);
glColor4ubv((GLubyte *) & CTX::instance()->color.bg);
glVertex2i(viewport[0], viewport[1]);
glVertex2i(viewport[2], viewport[1]);
glColor4ubv((GLubyte *) & CTX::instance()->color.bgGrad);
glVertex2i(viewport[2], viewport[3]);
glVertex2i(viewport[0], viewport[3]);
glEnd();
}
else if(CTX::instance()->bgGradient == 2){ // horizontal
glBegin(GL_QUADS);
glColor4ubv((GLubyte *) & CTX::instance()->color.bg);
glVertex2i(viewport[2], viewport[1]); glVertex2i(viewport[2], viewport[3]);
glColor4ubv((GLubyte *) & CTX::instance()->color.bgGrad);
glVertex2i(viewport[0], viewport[3]);
glVertex2i(viewport[0], viewport[1]);
glEnd();
}
else if(CTX::instance()->bgGradient == 3){ // radial
double cx = 0.5 * (viewport[0] + viewport[2]);
double cy = 0.5 * (viewport[1] + viewport[3]);
double r = 0.5 * std::max(viewport[2] - viewport[0],
viewport[3] - viewport[1]);
glBegin(GL_TRIANGLE_FAN);
glColor4ubv((GLubyte *) & CTX::instance()->color.bgGrad);
glVertex2d(cx, cy);
glColor4ubv((GLubyte *) & CTX::instance()->color.bg);
glVertex2d(cx + r, cy);
int ntheta = 36;
for(int i = 1; i < ntheta + 1; i ++){
double theta = i * 2 * M_PI / (double)ntheta;
glVertex2d(cx + r * cos(theta), cy + r * sin(theta));
}
glEnd();
}
}
void drawContext::invalidateBgImageTexture()
{
if(_bgImageTexture) glDeleteTextures(1, &_bgImageTexture);
_bgImageTexture = 0;
}
bool drawContext::generateTextureForImage(const std::string &name, int page,
GLuint &imageTexture, GLuint &imageW,
GLuint &imageH)
{
if(StatFile(name)){
Msg::Warning("Could not open file `%s'", name.c_str());
return false;
}
std::string ext = SplitFileName(name)[2];
if(ext == ".pdf" || ext == ".PDF"){
#if defined(HAVE_POPPLER)
if(!imageTexture){
if(!gmshPopplerWrapper::instance()->loadFromFile(name)){
Msg::Error("Could not load PDF file '%s'", name.c_str());
return false;
}
}
gmshPopplerWrapper::instance()->setCurrentPage(page);
imageTexture = gmshPopplerWrapper::instance()->getTextureForPage(300, 300);
imageW = gmshPopplerWrapper::instance()->width();
imageH = gmshPopplerWrapper::instance()->height();
#else
Msg::Error("Gmsh must be compiled with Poppler support to load PDFs");
return false;
#endif
}
else{
#if defined(HAVE_FLTK)
if(!imageTexture){
Fl_RGB_Image *img = 0;
if(ext == ".jpg" || ext == ".JPG" || ext == ".jpeg" || ext == ".JPEG")
img = new Fl_JPEG_Image(name.c_str());
else if(ext == ".png" || ext == ".PNG")
img = new Fl_PNG_Image(name.c_str());
if(!img){
Msg::Error("Could not load background image '%s'", name.c_str());
return false;
} Fl_RGB_Image *img2 = (Fl_RGB_Image*)img->copy(2048, 2048);
glGenTextures(1, &imageTexture);
glBindTexture(GL_TEXTURE_2D, imageTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img2->w(), img2->h(), 0,
(img2->d() == 4) ? GL_RGBA : GL_RGB,
GL_UNSIGNED_BYTE, img2->array);
imageW = img->w();
imageH = img->h();
delete img;
delete img2;
}
#else
Msg::Error("Gmsh must be compiled with FLTK support to load JPEGs or PNGs");
return false;
#endif
}
return true;
}
void drawContext::drawBackgroundImage(bool threeD)
{
if(CTX::instance()->bgImageFileName.empty() ||
(CTX::instance()->bgImage3d && !threeD) ||
(!CTX::instance()->bgImage3d && threeD)) return;
std::string name = FixRelativePath(GModel::current()->getFileName(),
CTX::instance()->bgImageFileName);
double x = CTX::instance()->bgImagePosition[0];
double y = CTX::instance()->bgImagePosition[1];
double w = CTX::instance()->bgImageSize[0];
double h = CTX::instance()->bgImageSize[1];
if(!generateTextureForImage(name, CTX::instance()->bgImagePage,
_bgImageTexture, _bgImageW, _bgImageH)){
CTX::instance()->bgImageFileName.clear();
return;
}
if(!_bgImageTexture) return;
if(w < 0 && h < 0){
w = viewport[2] - viewport[0];
h = viewport[3] - viewport[1];
}
else if(w < 0 && h == 0){
w = viewport[2] - viewport[0];
h = w * _bgImageH / _bgImageW;
}
else if(w < 0){
w = viewport[2] - viewport[0];
}
else if(w == 0 && h < 0){
h = viewport[3] - viewport[1];
w = h * _bgImageW / _bgImageH;
}
else if(h < 0){
h = viewport[3] - viewport[1];
}
else if(w == 0 && h == 0){
w = _bgImageW;
h = _bgImageH;
}
else if(h == 0){
h = w * _bgImageH / _bgImageW;
}
else if(w == 0){
w = h * _bgImageW / _bgImageH; }
Msg::Debug("Background image: x=%g y=%g w=%g h=%g", x, y, w, h);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, _bgImageTexture);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glBegin(GL_QUADS);
if(threeD){
glTexCoord2f(1.0f, 1.0f); glVertex2d(x+w, y);
glTexCoord2f(1.0f, 0.0f); glVertex2d(x+w, y+h);
glTexCoord2f(0.0f, 0.0f); glVertex2d(x, y+h);
glTexCoord2f(0.0f, 1.0f); glVertex2d(x, y);
}
else{
int c = fix2dCoordinates(&x, &y); // y=0 now means top
if(c & 1) x -= w / 2.;
if(c & 2) y += h / 2.;
if(x < viewport[0]) x = viewport[0];
if(y < viewport[1]) y = viewport[1];
glTexCoord2f(1.0f, 1.0f); glVertex2d(x+w, y-h);
glTexCoord2f(1.0f, 0.0f); glVertex2d(x+w, y);
glTexCoord2f(0.0f, 0.0f); glVertex2d(x, y);
glTexCoord2f(0.0f, 1.0f); glVertex2d(x, y-h);
}
glEnd();
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
}
void drawContext::initProjection(int xpick, int ypick, int wpick, int hpick)
{
double Va =
(double) (viewport[3] - viewport[1]) /
(double) (viewport[2] - viewport[0]);
double Wa = (CTX::instance()->max[1] - CTX::instance()->min[1]) /
(CTX::instance()->max[0] - CTX::instance()->min[0]);
// compute the viewport in World coordinates (with margins)
if(Va > Wa) {
vxmin = CTX::instance()->min[0];
vxmax = CTX::instance()->max[0];
vymin = 0.5 * (CTX::instance()->min[1] + CTX::instance()->max[1] -
Va * (CTX::instance()->max[0] - CTX::instance()->min[0]));
vymax = 0.5 * (CTX::instance()->min[1] + CTX::instance()->max[1] +
Va * (CTX::instance()->max[0] - CTX::instance()->min[0]));
}
else {
vxmin = 0.5 * (CTX::instance()->min[0] + CTX::instance()->max[0] -
(CTX::instance()->max[1] - CTX::instance()->min[1]) / Va);
vxmax = 0.5 * (CTX::instance()->min[0] + CTX::instance()->max[0] +
(CTX::instance()->max[1] - CTX::instance()->min[1]) / Va);
vymin = CTX::instance()->min[1];
vymax = CTX::instance()->max[1];
}
double fact = CTX::instance()->displayBorderFactor;
double xborder = fact * (vxmax - vxmin), yborder = fact * (vymax - vymin);
vxmin -= xborder;
vxmax += xborder;
vymin -= yborder;
vymax += yborder;
// store what one pixel represents in world coordinates
pixel_equiv_x = (vxmax - vxmin) / (viewport[2] - viewport[0]);
pixel_equiv_y = (vymax - vymin) / (viewport[3] - viewport[1]);
// no initial translation of the model
t_init[0] = t_init[1] = t_init[2] = 0.;
// set up the near and far clipping planes so that the box is large enough to
// manipulate the model and zoom, but not too big (otherwise the z-buffer
// resolution e.g. with Mesa can become insufficient)
double zmax = std::max(fabs(CTX::instance()->min[2]),
fabs(CTX::instance()->max[2]));
if(zmax < CTX::instance()->lc) zmax = CTX::instance()->lc;
if (CTX::instance()->camera) { // if we use the camera mode
glDisable(GL_DEPTH_TEST);
glPushMatrix();
glLoadIdentity();
double w = (double)viewport[2];
double h = (double)viewport[3];
double ratio = w / h;
double dx = 1.5 * tan(camera.radians) * w * ratio;
double dy = 1.5 * tan(camera.radians) * w;
double dz = -w * 1.25;
glBegin(GL_QUADS);
glColor4ubv((GLubyte *) & CTX::instance()->color.bg);
glVertex3i((int)-dx, (int)-dy, (int)dz);
glVertex3i((int) dx, (int)-dy, (int)dz);
glColor4ubv((GLubyte *) & CTX::instance()->color.bgGrad);
glVertex3i((int) dx, (int)dy, (int)dz);
glVertex3i((int)-dx, (int)dy, (int)dz);
glEnd();
glPopMatrix();
glEnable(GL_DEPTH_TEST);
}
else if(!CTX::instance()->camera){ // if not in camera mode
double clip_near, clip_far;
if(CTX::instance()->ortho) {
clip_near = -zmax * s[2] * CTX::instance()->clipFactor;
clip_far = -clip_near;
}
else {
clip_near = 0.75 * CTX::instance()->clipFactor * zmax;
clip_far = 75. * CTX::instance()->clipFactor * zmax;
}
// setup projection matrix
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// restrict picking to a rectangular region around xpick,ypick
if(render_mode == GMSH_SELECT)
gluPickMatrix((GLdouble)xpick, (GLdouble)(viewport[3] - ypick),
(GLdouble)wpick, (GLdouble)hpick, (GLint *)viewport);
// draw background if not in selection mode
if(render_mode != GMSH_SELECT &&
(CTX::instance()->bgGradient || CTX::instance()->bgImageFileName.size()) &&
(!CTX::instance()->printing || CTX::instance()->print.background)){
glDisable(GL_DEPTH_TEST);
glPushMatrix();
glLoadIdentity();
// the z values and the translation are only needed for GL2PS, which does
// not understand "no depth test" (hence we must make sure that we draw
// the background behind the rest of the scene)
glOrtho((double)viewport[0], (double)viewport[2],
(double)viewport[1], (double)viewport[3],
clip_near, clip_far);
glTranslated(0., 0., -0.99 * clip_far);
drawBackgroundGradient();
// hack for GL2PS (to make sure that the image is in front of the
// gradient)
glTranslated(0., 0., 0.01 * clip_far);
drawBackgroundImage(false);
glPopMatrix();
glEnable(GL_DEPTH_TEST); }
if(CTX::instance()->ortho) {
glOrtho(vxmin, vxmax, vymin, vymax, clip_near, clip_far);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
else {
// recenter the model such that the perspective is always at the center of
// gravity (we should maybe add an option to choose this, as we do for the
// rotation center)
t_init[0] = CTX::instance()->cg[0];
t_init[1] = CTX::instance()->cg[1];
vxmin -= t_init[0];
vxmax -= t_init[0];
vymin -= t_init[1];
vymax -= t_init[1];
glFrustum(vxmin, vxmax, vymin, vymax, clip_near, clip_far);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
double coef = (clip_far / clip_near) / 3.;
glTranslated(-coef * t_init[0], -coef * t_init[1], -coef * clip_near);
glScaled(coef, coef, coef);
}
}
}
void drawContext::initRenderModel()
{
glPushMatrix();
glLoadIdentity();
glScaled(s[0], s[1], s[2]);
glTranslated(t[0], t[1], t[2]);
for(int i = 0; i < 6; i++) {
if(CTX::instance()->light[i]) {
GLfloat position[4] = {(GLfloat)CTX::instance()->lightPosition[i][0],
(GLfloat)CTX::instance()->lightPosition[i][1],
(GLfloat)CTX::instance()->lightPosition[i][2],
(GLfloat)CTX::instance()->lightPosition[i][3]};
glLightfv((GLenum)(GL_LIGHT0 + i), GL_POSITION, position);
GLfloat r = (GLfloat)(CTX::instance()->unpackRed
(CTX::instance()->color.ambientLight[i]) / 255.);
GLfloat g = (GLfloat)(CTX::instance()->unpackGreen
(CTX::instance()->color.ambientLight[i]) / 255.);
GLfloat b = (GLfloat)(CTX::instance()->unpackBlue
(CTX::instance()->color.ambientLight[i]) / 255.);
GLfloat ambient[4] = {r, g, b, 1.0F};
glLightfv((GLenum)(GL_LIGHT0 + i), GL_AMBIENT, ambient);
r = (GLfloat)(CTX::instance()->unpackRed
(CTX::instance()->color.diffuseLight[i]) / 255.);
g = (GLfloat)(CTX::instance()->unpackGreen
(CTX::instance()->color.diffuseLight[i]) / 255.);
b = (GLfloat)(CTX::instance()->unpackBlue
(CTX::instance()->color.diffuseLight[i]) / 255.);
GLfloat diffuse[4] = {r, g, b, 1.0F};
glLightfv((GLenum)(GL_LIGHT0 + i), GL_DIFFUSE, diffuse);
r = (GLfloat)(CTX::instance()->unpackRed
(CTX::instance()->color.specularLight[i]) / 255.);
g = (GLfloat)(CTX::instance()->unpackGreen
(CTX::instance()->color.specularLight[i]) / 255.);
b = (GLfloat)(CTX::instance()->unpackBlue
(CTX::instance()->color.specularLight[i]) / 255.);
GLfloat specular[4] = {r, g, b, 1.0F};
glLightfv((GLenum)(GL_LIGHT0 + i), GL_SPECULAR, specular);
glEnable((GLenum)(GL_LIGHT0 + i)); }
else{
glDisable((GLenum)(GL_LIGHT0 + i));
}
}
glPopMatrix();
// ambient and diffuse material colors track glColor automatically
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
glEnable(GL_COLOR_MATERIAL);
// "white"-only specular material reflection color
GLfloat spec[4] = {(GLfloat)CTX::instance()->shine,
(GLfloat)CTX::instance()->shine,
(GLfloat)CTX::instance()->shine, 1.0F};
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, spec);
// specular exponent in [0,128] (larger means more "focused"
// reflection)
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS,
(GLfloat)CTX::instance()->shineExponent);
glShadeModel(GL_SMOOTH);
// Normalize the normals automatically. We could use the more efficient
// glEnable(GL_RESCALE_NORMAL) instead (since we initially specify unit
// normals), but GL_RESCALE_NORMAL does only work with isotropic scalings (and
// we allow anistotropic scalings in myZoom). Note that GL_RESCALE_NORMAL is
// only available in GL_VERSION_1_2.
glEnable(GL_NORMALIZE);
// lighting is enabled/disabled for each particular primitive later
glDisable(GL_LIGHTING);
}
void drawContext::initPosition()
{
glScaled(s[0], s[1], s[2]);
glTranslated(t[0], t[1], t[2]);
if(CTX::instance()->rotationCenterCg)
glTranslated(CTX::instance()->cg[0],
CTX::instance()->cg[1],
CTX::instance()->cg[2]);
else
glTranslated(CTX::instance()->rotationCenter[0],
CTX::instance()->rotationCenter[1],
CTX::instance()->rotationCenter[2]);
buildRotationMatrix();
glMultMatrixd(rot);
if(CTX::instance()->rotationCenterCg)
glTranslated(-CTX::instance()->cg[0],
-CTX::instance()->cg[1],
-CTX::instance()->cg[2]);
else
glTranslated(-CTX::instance()->rotationCenter[0],
-CTX::instance()->rotationCenter[1],
-CTX::instance()->rotationCenter[2]);
// store the projection and modelview matrices at this precise moment (so that
// we can use them at any later time, even if the context has changed, i.e.,
// even if we are out of draw())
glGetDoublev(GL_PROJECTION_MATRIX, proj);
glGetDoublev(GL_MODELVIEW_MATRIX, model);
for(int i = 0; i < 6; i++)
glClipPlane((GLenum)(GL_CLIP_PLANE0 + i), CTX::instance()->clipPlane[i]);
}
// Takes a cursor position in window coordinates and returns the line (given by// a point and a unit direction vector), in real space, that corresponds to that
// cursor position
void drawContext::unproject(double winx, double winy, double p[3], double d[3])
{
if(isHighResolution()){
winx *= 2; // true pixels
winy *= 2;
}
GLint vp[4];
glGetIntegerv(GL_VIEWPORT, vp);
winy = vp[3] - winy;
GLdouble x0, y0, z0, x1, y1, z1;
// we use the stored model and proj matrices instead of directly
// getGetDouble'ing the matrices since unproject can be called in or after
// draw2d
if(!gluUnProject(winx, winy, 0.0, model, proj, vp, &x0, &y0, &z0))
Msg::Warning("unproject1 failed");
if(!gluUnProject(winx, winy, 1.0, model, proj, vp, &x1, &y1, &z1))
Msg::Warning("unproject2 failed");
p[0] = x0;
p[1] = y0;
p[2] = z0;
d[0] = x1 - x0;
d[1] = y1 - y0;
d[2] = z1 - z0;
double len = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
d[0] /= len;
d[1] /= len;
d[2] /= len;
}
void drawContext::viewport2World(double vp[3], double xyz[3])
{
GLint viewport[4];
GLdouble model[16], proj[16];
glGetIntegerv(GL_VIEWPORT, viewport);
glGetDoublev(GL_PROJECTION_MATRIX, proj);
glGetDoublev(GL_MODELVIEW_MATRIX, model);
gluUnProject(vp[0], vp[1], vp[2], model, proj, viewport, &xyz[0], &xyz[1], &xyz[2]);
}
void drawContext::world2Viewport(double xyz[3], double vp[3])
{
GLint viewport[4];
GLdouble model[16], proj[16];
glGetIntegerv(GL_VIEWPORT, viewport);
glGetDoublev(GL_PROJECTION_MATRIX, proj);
glGetDoublev(GL_MODELVIEW_MATRIX, model);
gluProject(xyz[0], xyz[1], xyz[2], model, proj, viewport, &vp[0], &vp[1], &vp[2]);
}
class hit{
public:
GLuint type, ient, depth, type2, ient2;
hit(GLuint t, GLuint i, GLuint d, GLuint t2=0, GLuint i2=0)
: type(t), ient(i), depth(d), type2(t2), ient2(i2) {}
};
class hitDepthLessThan{
public:
bool operator()(const hit &h1, const hit &h2) const
{
return h1.depth < h2.depth;
}
};
// returns the element at a given position in a vertex array (element pointers
// are not always stored: returning 0 is not an error)
static MElement *getElement(GEntity *e, int va_type, int index)
{
switch(va_type){
case 2:
if(e->va_lines && index < e->va_lines->getNumElementPointers())
return *e->va_lines->getElementPointerArray(index);
break;
case 3:
if(e->va_triangles && index < e->va_triangles->getNumElementPointers())
return *e->va_triangles->getElementPointerArray(index);
break;
}
return 0;
}
bool drawContext::select(int type, bool multiple, bool mesh,
int x, int y, int w, int h,
std::vector<GVertex*> &vertices,
std::vector<GEdge*> &edges,
std::vector<GFace*> &faces,
std::vector<GRegion*> ®ions,
std::vector<MElement*> &elements,
std::vector<SPoint2> &points,
std::vector<PView*> &views)
{
vertices.clear();
edges.clear();
faces.clear();
regions.clear();
elements.clear();
points.clear();
views.clear();
// in our case the selection buffer size is equal to between 5 and 7 times the
// maximum number of possible hits
GModel *m = GModel::current();
int eles = (mesh && CTX::instance()->pickElements) ? 4 * m->getNumMeshElements() : 0;
int nviews = PView::list.size() * 100;
int size = 7 * (m->getNumVertices() + m->getNumEdges() + m->getNumFaces() +
m->getNumRegions() + eles) + nviews;
if(!size) return false; // the model is empty, don't bother!
// allocate selection buffer
size += 1000; // just to make sure
GLuint *selectionBuffer = new GLuint[size];
glSelectBuffer(size, selectionBuffer);
// do one rendering pass in select mode
render_mode = drawContext::GMSH_SELECT;
glRenderMode(GL_SELECT);
glInitNames();
glPushMatrix();
// 3d stuff
initProjection(x, y, w, h);
initPosition();
drawGeom();
if(mesh) drawMesh();
drawPost();
drawGraph2d(true);
// 2d stuff
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPickMatrix((GLdouble)x, (GLdouble)(viewport[3] - y),
(GLdouble)w, (GLdouble)h, (GLint *)viewport);
glOrtho((double)viewport[0], (double)viewport[2], (double)viewport[1], (double)viewport[3],
-100., 100.); // in pixels, so we can draw some 3D glyphs
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
drawGraph2d(false);
drawText2d();
glPopMatrix();
GLint numhits = glRenderMode(GL_RENDER);
render_mode = drawContext::GMSH_RENDER;
if(!numhits){ // no hits
delete [] selectionBuffer;
return false;
}
else if(numhits < 0){ // overflow
delete [] selectionBuffer;
Msg::Warning("Too many entities selected");
return false;
}
// decode the hits
std::vector<hit> hits;
GLuint *ptr = selectionBuffer;
for(int i = 0; i < numhits; i++) {
// in Gmsh 'names' should always be 0, 2 or 4:
// * names == 0 means that there is nothing on the stack
// * if names == 2, the first name is the type of the entity (0 for point, 1
// for edge, 2 for face or 3 for volume) and the second is the entity
// number;
// * if names == 4, the first name is the type of the entity, the second is
// the entity number, the third is the type of vertex array (2 for line, 3
// for triangle, 4 for quad) and the fourth is the index of the element in
// the vertex array
GLuint names = *ptr++;
GLuint mindepth = *ptr++;
GLuint maxdepth = *ptr++;
if(names == 2){
GLuint depth = maxdepth + 0 * mindepth; // could do something with mindepth
GLuint type = *ptr++;
GLuint ient = *ptr++;
hits.push_back(hit(type, ient, depth));
}
else if(names == 4){
GLuint depth = maxdepth + 0 * mindepth; // could do something with mindepth
GLuint type = *ptr++;
GLuint ient = *ptr++;
GLuint type2 = *ptr++;
GLuint ient2 = *ptr++;
hits.push_back(hit(type, ient, depth, type2, ient2));
}
}
delete [] selectionBuffer;
if(!hits.size()){ // no entities
return false;
}
// sort hits to get closest entities first
std::sort(hits.begin(), hits.end(), hitDepthLessThan());
// filter result: if type == ENT_NONE, return the closest entity of "lowest
// dimension" (point < line < surface < volume). Otherwise, return the closest
// entity of type "type"
GLuint typmin = 10;
for(unsigned int i = 0; i < hits.size(); i++)
typmin = std::min(typmin, hits[i].type);
for(unsigned int i = 0; i < hits.size(); i++) {
if((type == ENT_ALL) ||
(type == ENT_NONE && hits[i].type == typmin) ||
(type == ENT_POINT && hits[i].type == 0) ||
(type == ENT_LINE && hits[i].type == 1) ||
(type == ENT_SURFACE && hits[i].type == 2) ||
(type == ENT_VOLUME && hits[i].type == 3)){
switch (hits[i].type) {
case 0:
{
GVertex *v = m->getVertexByTag(hits[i].ient);
if(!v){
Msg::Error("Problem in point selection processing");
return false;
}
vertices.push_back(v);
if(!multiple) return true;
}
break;
case 1:
{
GEdge *e = m->getEdgeByTag(hits[i].ient);
if(!e){
Msg::Error("Problem in line selection processing");
return false;
}
if(hits[i].type2){
MElement *ele = getElement(e, hits[i].type2, hits[i].ient2);
if(ele) elements.push_back(ele);
}
edges.push_back(e);
if(!multiple) return true;
}
break;
case 2:
{
GFace *f = m->getFaceByTag(hits[i].ient);
if(!f){
Msg::Error("Problem in surface selection processing");
return false;
}
if(hits[i].type2){
MElement *ele = getElement(f, hits[i].type2, hits[i].ient2);
if(ele) elements.push_back(ele);
}
faces.push_back(f);
if(!multiple) return true;
}
break;
case 3:
{
GRegion *r = m->getRegionByTag(hits[i].ient);
if(!r){
Msg::Error("Problem in volume selection processing");
return false;
}
if(hits[i].type2){
MElement *ele = getElement(r, hits[i].type2, hits[i].ient2);
if(ele) elements.push_back(ele);
}
regions.push_back(r);
if(!multiple) return true;
}
break;
case 4:
{
int tag = hits[i].ient;
SPoint2 p = getGraph2dDataPointForTag(tag);
points.push_back(p);
if(!multiple) return true; }
break;
case 5:
{
int tag = hits[i].ient;
if(tag >= 0 && tag < (int)PView::list.size())
views.push_back(PView::list[tag]);
if(!multiple) return true;
}
break;
}
}
}
if(vertices.size() || edges.size() || faces.size() || regions.size() ||
elements.size() || points.size() || views.size())
return true;
return false;
}