/*****************************************************************************
** FILE IDENTIFICATION
-**
+**
** Name: phm.cpp
** Purpose: Routines for phantom objects
-** Progammer: Kevin Rosenberg
+** Progammer: Kevin Rosenberg
** Date Started: Aug 1984
**
** This is part of the CTSim program
#include "ct.h"
const int PhantomElement::POINTS_PER_CIRCLE = 360;
-const double PhantomElement::SCALE_PELEM_EXTENT=0.000; // increase pelem limits by 0.5%
-//const double PhantomElement::SCALE_PELEM_EXTENT=0.005; // increase pelem limits by 0.5%
+const double PhantomElement::SCALE_PELEM_EXTENT=0.000; // increase pelem limits by 0.5%
+//const double PhantomElement::SCALE_PELEM_EXTENT=0.005; // increase pelem limits by 0.5%
const int Phantom::PHM_INVALID = -1;
const int Phantom::PHM_HERMAN = 0;
const int Phantom::PHM_SHEPP_LOGAN = 1;
const int Phantom::PHM_UNITPULSE = 2;
-const char* Phantom::s_aszPhantomName[] =
+const char* Phantom::s_aszPhantomName[] =
{
"herman",
"shepp-logan",
"unit-pulse",
};
-const char* Phantom::s_aszPhantomTitle[] =
+const char* Phantom::s_aszPhantomTitle[] =
{
"Herman Head",
"Shepp-Logan",
createFromPhantom (phmName);
}
-void
+void
Phantom::init ()
{
m_nPElem = 0;
Phantom::convertPhantomIDToName (int phmID)
{
static const char *name = "";
-
+
if (phmID >= 0 && phmID < s_iPhantomCount)
return (s_aszPhantomName[phmID]);
-
+
return (name);
}
Phantom::convertPhantomIDToTitle (int phmID)
{
static const char *title = "";
-
+
if (phmID >= 0 && phmID < s_iPhantomCount)
return (s_aszPhantomName[phmID]);
-
+
return (title);
}
int
-Phantom::convertNameToPhantomID (const char* const phmName)
+Phantom::convertNameToPhantomID (const char* const phmName)
{
int id = PHM_INVALID;
-
+
for (int i = 0; i < s_iPhantomCount; i++)
if (strcasecmp (phmName, s_aszPhantomName[i]) == 0) {
id = i;
break;
}
-
+
return (id);
}
m_failMessage += phmName;
return false;
}
-
+
m_name = phmName;
createFromPhantom (phmid);
return true;
bool
Phantom::createFromPhantom (const int phmid)
{
- switch (phmid)
+ switch (phmid)
{
case PHM_HERMAN:
addStdHerman();
break;
case PHM_UNITPULSE:
m_composition = P_UNIT_PULSE;
- addPElem ("rectangle", 0., 0., 100., 100., 0., 0.); // outline
- addPElem ("ellipse", 0., 0., 1., 1., 0., 1.); // pulse
+ addPElem ("rectangle", 0., 0., 100., 100., 0., 0.); // outline
+ addPElem ("ellipse", 0., 0., 1., 1., 0., 1.); // pulse
break;
default:
m_fail = true;
m_failMessage += phmid;
return false;
}
-
+
m_id = phmid;
-
+
return true;
}
{
bool bGoodFile = true;
FILE *fp;
-
+
if ((fp = fopen (fname, "r")) == NULL)
return (false);
-
+
m_name = fname;
-
+
while (1) {
double cx, cy, u, v, rot, dens;
char pelemtype[80];
-
+
int status = fscanf (fp, "%79s %lf %lf %lf %lf %lf %lf", pelemtype, &cx, &cy, &u, &v, &rot, &dens);
-
- if (status == static_cast<int>(EOF))
+
+ if (status == static_cast<int>(EOF))
break;
else if (status != 7) {
sys_error (ERR_WARNING, "Insufficient fields reading phantom file %s [Phantom::createFromFile]", fname);
}
addPElem (pelemtype, cx, cy, u, v, rot, dens);
}
-
+
fclose (fp);
-
+
return (bGoodFile);
}
Phantom::fileWrite (const char* const fname)
{
fstream file (fname, std::ios::out);
-
+
if (! file.fail())
printDefinitions (file);
return ! file.fail();
}
/* NAME
-* addPElem Add pelem
+* addPElem Add pelem
*
* SYNOPSIS
* addPElem (type, cx, cy, u, v, rot, atten)
-* char *type type of pelem (box, ellipse, etc)
-* double cx, cy pelem center
-* double u,v pelem size
-* double rot rotation angle of pelem (in degrees)
-* double atten x-ray attenuation cooefficient
+* char *type type of pelem (box, ellipse, etc)
+* double cx, cy pelem center
+* double u,v pelem size
+* double rot rotation angle of pelem (in degrees)
+* double atten x-ray attenuation cooefficient
*/
-void
+void
Phantom::addPElem (const char *type, const double cx, const double cy, const double u, const double v, const double rot, const double atten)
{
PhmElemType pe_type = PhantomElement::convertNameToType (type);
sys_error (ERR_WARNING, "Unknown PhantomElement type %s [PhantomElement::PhantomElement]", type);
return;
}
-
+
PhantomElement *pelem = new PhantomElement (type, cx, cy, u, v, rot, atten);
m_listPElem.push_front (pelem);
-
+
// update phantom limits
if (m_xmin > pelem->xmin()) m_xmin = pelem->xmin();
if (m_xmax < pelem->xmax()) m_xmax = pelem->xmax();
if (m_ymin > pelem->ymin()) m_ymin = pelem->ymin();
if (m_ymax < pelem->ymax()) m_ymax = pelem->ymax();
-
+
m_nPElem++;
}
/*----------------------------------------------------------------------*/
-/* Input-Output Routines */
+/* Input-Output Routines */
/*----------------------------------------------------------------------*/
/* NAME
-* print Print vertices of Phantom pelems
+* print Print vertices of Phantom pelems
*
* SYNOPSIS
* print (phm)
*/
-void
+void
Phantom::print (std::ostream& os) const
{
os << "Number of PElements: " << m_nPElem << "\n";
os << "Limits: xmin=" << m_xmin << ", ymin=" << m_ymin << ", xmax=" << m_xmax << ", ymax=" << m_ymax << "\n";
-
+
for (PElemConstIterator i = m_listPElem.begin(); i != m_listPElem.end(); i++) {
const PhantomElement& rPE = **i;
os << "PhantomElement: nPoints=" << rPE.nOutlinePoints();
os << ", atten=" << rPE.atten() << " rot=" << convertRadiansToDegrees (rPE.rot()) << "\n";
os << "xmin=" << rPE.xmin() << ", ymin=" << rPE.ymin() << ", xmax=" << rPE.xmax() << ", ymax=" << rPE.ymax() << "\n";
-
+
if (false)
for (int i = 0; i < rPE.nOutlinePoints(); i++)
os << rPE.xOutline()[i] << "," << rPE.yOutline()[i] << "\n";
}
}
-void
+void
Phantom::print (std::ostringstream& os) const
{
os << "Number of PElements: " << m_nPElem << "\n";
os << "Limits: xmin=" << m_xmin << ", ymin=" << m_ymin << ", xmax=" << m_xmax << ", ymax=" << m_ymax << "\n";
-
+
for (PElemConstIterator i = m_listPElem.begin(); i != m_listPElem.end(); i++) {
const PhantomElement& rPE = **i;
os << "PhantomElement: nPoints=" << rPE.nOutlinePoints();
os << ", atten=" << rPE.atten() << " rot=" << convertRadiansToDegrees (rPE.rot()) << "\n";
os << "xmin=" << rPE.xmin() << ", ymin=" << rPE.ymin() << ", xmax=" << rPE.xmax() << ", ymax=" << rPE.ymax() << "\n";
-
+
if (false)
for (int i = 0; i < rPE.nOutlinePoints(); i++)
os << rPE.xOutline()[i] << "," << rPE.yOutline()[i] << "\n";
/* NAME
-* show Show vector outline of Phantom to user
+* show Show vector outline of Phantom to user
*
* SYNOPSIS
* show (pic)
*/
#ifdef HAVE_SGP
-void
+void
Phantom::show () const
{
SGPDriver driverSGP ("Phantom Show");
SGP sgp (driverSGP);
-
+
show (sgp);
-
+
std::cout << "Press return to continue";
cio_kb_getc();
}
-void
+void
Phantom::show (SGP& sgp) const
{
double wsize = m_xmax - m_xmin;
- if ((m_ymax - m_ymin) > wsize)
+ if ((m_ymax - m_ymin) > wsize)
wsize = m_ymax - m_ymin;
wsize *= 1.01;
double halfWindow = wsize / 2;
-
+
double xcent = m_xmin + (m_xmax - m_xmin) / 2;
double ycent = m_ymin + (m_ymax - m_ymin) / 2;
-
+
sgp.setWindow (xcent - halfWindow, ycent - halfWindow, xcent + halfWindow, ycent + halfWindow);
-
+
draw (sgp);
}
#endif
/* NAME
-* draw Draw vector outline of Phantom
+* draw Draw vector outline of Phantom
*
* SYNOPSIS
* draw ()
*/
#ifdef HAVE_SGP
-void
+void
Phantom::draw (SGP& sgp) const
{
for (PElemIterator i = m_listPElem.begin(); i != m_listPElem.end(); i++)
/* NAME
-* addStdSheppLogan Make head phantom of Shepp-Logan
+* addStdSheppLogan Make head phantom of Shepp-Logan
*
* REFERENCES
* S. W. Rowland, "Computer Implementation of Image Reconstruction
-* Formulas", in "Image Reconstruction from Projections: Implementation
-* and Applications", edited by G. T. Herman, 1978.
+* Formulas", in "Image Reconstruction from Projections: Implementation
+* and Applications", edited by G. T. Herman, 1978.
*/
-void
+void
Phantom::addStdSheppLogan ()
{
addPElem ("ellipse", 0.0000, 0.0000, 0.6900, 0.9200, 0.0, 1.00);
/* NAME
-* addStdHerman Standard head phantom of G. T. Herman
+* addStdHerman Standard head phantom of G. T. Herman
*
* REFERENCES
* G. T. Herman, "Image Reconstructions from Projections: The Fundementals
-* of Computed Tomography", 1979.
+* of Computed Tomography", 1979.
*/
-void
+void
Phantom::addStdHerman ()
{
addPElem ("ellipse", 0.000, 1.50, 0.375, 0.3000, 90.00, -0.003);
/* NAME
-* convertToImagefile Make image array from Phantom
+* convertToImagefile Make image array from Phantom
*
* SYNOPSIS
* pic_to_imagefile (pic, im, nsample)
-* Phantom& pic Phantom definitions
-* ImageFile *im Computed pixel array
-* int nsample Number of samples along each axis for each pixel
-* (total samples per pixel = nsample * nsample)
+* Phantom& pic Phantom definitions
+* ImageFile *im Computed pixel array
+* int nsample Number of samples along each axis for each pixel
+* (total samples per pixel = nsample * nsample)
*/
void
convertToImagefile (im, dViewRatio, in_nsample, trace, 0, im.nx(), true);
}
-void
-Phantom::convertToImagefile (ImageFile& im, const double dViewRatio, const int in_nsample, const int trace,
+void
+Phantom::convertToImagefile (ImageFile& im, const double dViewRatio, const int in_nsample, const int trace,
const int colStart, const int colCount, bool bStoreAtColumnPos) const
{
int iStorageOffset = (bStoreAtColumnPos ? colStart : 0);
convertToImagefile (im, im.nx(), dViewRatio, in_nsample, trace, colStart, colCount, iStorageOffset);
}
-void
-Phantom::convertToImagefile (ImageFile& im, const int iTotalRasterCols, const double dViewRatio,
+void
+Phantom::convertToImagefile (ImageFile& im, const int iTotalRasterCols, const double dViewRatio,
const int in_nsample, const int trace, const int colStart, const int colCount, int iStorageOffset) const
{
const int nx = im.nx();
const int ny = im.ny();
if (nx < 2 || ny < 2)
return;
-
+
int nsample = in_nsample;
- if (nsample < 1)
+ if (nsample < 1)
nsample = 1;
-
+
double dx = m_xmax - m_xmin;
double dy = m_ymax - m_ymin;
double xcent = m_xmin + dx / 2;
double ycent = m_ymin + dy / 2;
double dHalflen = dViewRatio * (getDiameterBoundaryCircle() / SQRT2 / 2);
-
+
double xmin = xcent - dHalflen;
double xmax = xcent + dHalflen;
double ymin = ycent - dHalflen;
double ymax = ycent + dHalflen;
-
+
// Each pixel holds the average of the intensity of the cell with (ix,iy) at the center of the pixel
// Set major increments so that the last cell v[nx-1][ny-1] will start at xmax - xinc, ymax - yinc).
// Set minor increments so that sample points are centered in cell
-
+
double xinc = (xmax - xmin) / (iTotalRasterCols);
double yinc = (ymax - ymin) / ny;
-
- double kxinc = xinc / nsample; /* interval between samples */
+
+ double kxinc = xinc / nsample; /* interval between samples */
double kyinc = yinc / nsample;
- double kxofs = kxinc / 2; /* offset of 1st point */
+ double kxofs = kxinc / 2; /* offset of 1st point */
double kyofs = kyinc / 2;
-
+
im.setAxisExtent (xmin, xmax, ymin, ymax);
im.setAxisIncrement (xinc, yinc);
-
+
ImageFileArray v = im.getArray();
-
+
for (int ix = 0; ix < colCount; ix++) {
int iColStore = ix + iStorageOffset;
ImageFileColumn vCol = v[iColStore];
for (int iy = 0; iy < ny; iy++)
*vCol++ = 0;
}
-
+
double x_start = xmin + (colStart * xinc);
for (PElemConstIterator pelem = m_listPElem.begin(); pelem != m_listPElem.end(); pelem++) {
const PhantomElement& rPElem = **pelem;
} /* for iy */
} /* for ix */
} /* for pelem */
-
-
+
+
if (nsample > 1) {
double factor = 1.0 / static_cast<double>(nsample * nsample);
-
-
+
+
for (int ix = 0; ix < colCount; ix++) {
int iColStore = ix + iStorageOffset;
ImageFileColumn vCol = v[iColStore];
: m_cx(cx), m_cy(cy), m_u(u), m_v(v), m_atten(atten), m_nPoints(0), m_xOutline(0), m_yOutline(0)
{
m_rot = convertDegreesToRadians (rot); // convert angle to radians
-
+
m_type = convertNameToType (type);
-
+
makeTransformMatrices (); // calc transform matrices between phantom and normalized phantomelement
- makeVectorOutline (); // calculate vector outline of pelem
-
+ makeVectorOutline (); // calculate vector outline of pelem
+
m_rectLimits[0] = m_xmin; m_rectLimits[1] = m_ymin;
m_rectLimits[2] = m_xmax; m_rectLimits[3] = m_ymax;
}
PhantomElement::convertNameToType (const char* const typeName)
{
PhmElemType type = PELEM_INVALID;
-
+
if (strcasecmp (typeName, "rectangle") == 0)
type = PELEM_RECTANGLE;
else if (strcasecmp (typeName, "triangle") == 0)
type = PELEM_SECTOR;
else if (strcasecmp (typeName, "segment") == 0)
type = PELEM_SEGMENT;
-
+
return (type);
}
PhantomElement::convertTypeToName (PhmElemType iType)
{
static char* pszType = "Unknown";
-
+
if (iType == PELEM_RECTANGLE)
pszType = "rectangle";
else if (iType == PELEM_TRIANGLE)
pszType = "sector";
else if (iType == PELEM_SEGMENT)
pszType = "segment";
-
+
return pszType;
}
-void
+void
PhantomElement::makeTransformMatrices ()
{
GRFMTX_2D temp;
-
- // To map normalized Pelem coords to world Phantom
- // scale by (u, v)
- // rotate by rot
- // translate by (cx, cy)
-
+
+ // To map normalized Pelem coords to world Phantom
+ // scale by (u, v)
+ // rotate by rot
+ // translate by (cx, cy)
+
scale_mtx2 (m_xformObjToPhm, m_u, m_v);
rot_mtx2 (temp, m_rot);
mult_mtx2 (m_xformObjToPhm, temp, m_xformObjToPhm);
xlat_mtx2 (temp, m_cx, m_cy);
mult_mtx2 (m_xformObjToPhm, temp, m_xformObjToPhm);
-
+
// to map world Phantom coodinates to normalized PElem coords
// translate by (-cx, -cy)
// rotate by -rot
// scale by (1/u, 1/v)
-
+
xlat_mtx2 (m_xformPhmToObj, -m_cx, -m_cy);
rot_mtx2 (temp, -m_rot);
mult_mtx2 (m_xformPhmToObj, temp, m_xformPhmToObj);
/* NAME
-* pelem_make_points INTERNAL routine to calculate point array for an pelem
+* pelem_make_points INTERNAL routine to calculate point array for an pelem
*
* SYNOPSIS
* makepelempts (pelem)
-* PELEM *pelem pelem whose points we are calculating
+* PELEM *pelem pelem whose points we are calculating
*
* NOTES
* Called by phm_add_pelem()
double radius, theta, start, stop;
double xfact, yfact;
int cpts;
-
+
m_nPoints = 0;
switch (m_type) {
case PELEM_RECTANGLE:
m_nPoints = 5;
m_xOutline = new double [m_nPoints];
m_yOutline = new double [m_nPoints];
- m_xOutline[0] =-m_u; m_yOutline[0] =-m_v;
- m_xOutline[1] = m_u; m_yOutline[1] =-m_v;
- m_xOutline[2] = m_u; m_yOutline[2] = m_v;
- m_xOutline[3] =-m_u; m_yOutline[3] = m_v;
- m_xOutline[4] =-m_u; m_yOutline[4] =-m_v;
+ m_xOutline[0] =-m_u; m_yOutline[0] =-m_v;
+ m_xOutline[1] = m_u; m_yOutline[1] =-m_v;
+ m_xOutline[2] = m_u; m_yOutline[2] = m_v;
+ m_xOutline[3] =-m_u; m_yOutline[3] = m_v;
+ m_xOutline[4] =-m_u; m_yOutline[4] =-m_v;
break;
case PELEM_TRIANGLE:
m_nPoints = 4;
m_xOutline = new double [m_nPoints];
m_yOutline = new double [m_nPoints];
- m_xOutline[0] =-m_u; m_yOutline[0] = 0.0;
- m_xOutline[1] = m_u; m_yOutline[1] = 0.0;
- m_xOutline[2] = 0.0; m_yOutline[2] = m_v;
- m_xOutline[3] =-m_u; m_yOutline[3] = 0.0;
+ m_xOutline[0] =-m_u; m_yOutline[0] = 0.0;
+ m_xOutline[1] = m_u; m_yOutline[1] = 0.0;
+ m_xOutline[2] = 0.0; m_yOutline[2] = m_v;
+ m_xOutline[3] =-m_u; m_yOutline[3] = 0.0;
break;
case PELEM_ELLIPSE:
cpts = numCirclePoints (TWOPI);
break;
case PELEM_SECTOR:
radius = sqrt(m_u * m_u + m_v * m_v);
- theta = atan(m_u / m_v); // angle with y-axis
+ theta = atan(m_u / m_v); // angle with y-axis
start = 3.0 * HALFPI - theta;
stop = 3.0 * HALFPI + theta;
cpts = numCirclePoints (stop - start);
m_nPoints = 3 + cpts;
m_xOutline = new double [m_nPoints];
m_yOutline = new double [m_nPoints];
-
- m_xOutline[0] = 0.0; m_yOutline[0] = m_v;
- m_xOutline[1] =-m_u; m_yOutline[1] = 0.0;
+
+ m_xOutline[0] = 0.0; m_yOutline[0] = m_v;
+ m_xOutline[1] =-m_u; m_yOutline[1] = 0.0;
calcArcPoints (&m_xOutline[2], &m_yOutline[2], cpts, 0.0, m_v, radius, start, stop);
m_xOutline[cpts + 2] = 0.0;
m_yOutline[cpts + 2] = m_v;
break;
case PELEM_SEGMENT:
radius = sqrt(m_u * m_u + m_v * m_v);
- theta = atan (m_u / m_v); // angle with y-axis
+ theta = atan (m_u / m_v); // angle with y-axis
start = 3.0 * HALFPI - theta;
stop = 3.0 * HALFPI + theta;
-
+
cpts = numCirclePoints (stop - start);
m_nPoints = cpts + 1;
m_xOutline = new double [m_nPoints];
m_yOutline = new double [m_nPoints];
-
+
calcArcPoints (m_xOutline, m_yOutline, cpts, 0.0, m_v, radius, start, stop);
m_xOutline[cpts] = -m_u;
m_yOutline[cpts] = 0.0;
sys_error(ERR_WARNING, "Illegal phantom element type %d [makeVectorOutline]", m_type);
return;
}
-
+
rotate2d (m_xOutline, m_yOutline, m_nPoints, m_rot);
xlat2d (m_xOutline, m_yOutline, m_nPoints, m_cx, m_cy);
-
+
minmax_array (m_xOutline, m_nPoints, m_xmin, m_xmax);
minmax_array (m_yOutline, m_nPoints, m_ymin, m_ymax);
-
+
// increase pelem extent by SCALE_PELEM_EXTENT to eliminate chance of
- // missing actual pelem maximum due to polygonal sampling
-
+ // missing actual pelem maximum due to polygonal sampling
+
xfact = (m_xmax - m_xmin) * SCALE_PELEM_EXTENT;
yfact = (m_ymax - m_ymin) * SCALE_PELEM_EXTENT;
-
+
m_xmin -= xfact;
m_ymin -= yfact;
m_xmax += xfact;
/* NAME
-* calc_arc Calculate outline of a arc of a circle
+* calc_arc Calculate outline of a arc of a circle
*
* SYNOPSIS
* calc_arc (x, y, xcent, ycent, pts, r, start, stop)
-* double x[], y[]; Array of points
-* int pts Number of points in array
-* double xcent, ycent Center of cirlce
-* double r Radius of circle
-* double start, stop Beginning & ending angles
+* double x[], y[]; Array of points
+* int pts Number of points in array
+* double xcent, ycent Center of cirlce
+* double r Radius of circle
+* double start, stop Beginning & ending angles
*/
-void
+void
PhantomElement::calcArcPoints (double x[], double y[], const int pts, const double xcent, const double ycent, const double r, const double start, const double stop)
{
if (r <= 0.0)
sys_error (ERR_WARNING, "negative or zero radius in calc_arc()");
-
- double theta = (stop - start) / (pts - 1); // angle incr. between points
+
+ double theta = (stop - start) / (pts - 1); // angle incr. between points
double c = cos(theta);
double s = sin(theta);
-
+
x[0] = r * cos (start) + xcent;
y[0] = r * sin (start) + ycent;
-
+
double xp = x[0] - xcent;
double yp = y[0] - ycent;
for (int i = 1; i < pts; i++) {
//
-void
+void
PhantomElement::calcEllipsePoints (double x[], double y[], const int pts, const double u, const double v)
{
- calcArcPoints (x, y, m_nPoints, 0.0, 0.0, 1.0, 0.0, TWOPI); // make a unit circle
- scale2d (x, y, m_nPoints, m_u, m_v); // scale to ellipse
+ calcArcPoints (x, y, m_nPoints, 0.0, 0.0, 1.0, 0.0, TWOPI); // make a unit circle
+ scale2d (x, y, m_nPoints, m_u, m_v); // scale to ellipse
}
/* NAME
-* circle_pts Calculate number of points to use for circle segment
+* circle_pts Calculate number of points to use for circle segment
*
* SYNOPSIS
* n = circle_pts (theta)
-* int n Number of points to use for arc
-* double theta Length of arc in radians
+* int n Number of points to use for arc
+* double theta Length of arc in radians
*/
-int
+int
PhantomElement::numCirclePoints (double theta)
{
theta = clamp (theta, 0., TWOPI);
-
+
return static_cast<int> (POINTS_PER_CIRCLE * theta / TWOPI + 1.5);
}
double cx1 = x1, cy1 = y1, cx2 = x2, cy2 = y2;
if (! clip_rect (cx1, cy1, cx2, cy2, m_rectLimits))
return false;
-
- // convert phantom coordinates to pelem coordinates
+
+ // convert phantom coordinates to pelem coordinates
xform_mtx2 (m_xformPhmToObj, x1, y1);
xform_mtx2 (m_xformPhmToObj, x2, y2);
-
+
if (! clipLineNormalizedCoords (x1, y1, x2, y2))
return false;
-
- // convert standard pelem coordinates back to phantom coordinates
+
+ // convert standard pelem coordinates back to phantom coordinates
xform_mtx2 (m_xformObjToPhm, x1, y1);
xform_mtx2 (m_xformObjToPhm, x2, y2);
-
+
return true;
}
/* NAME
-* pelem_clip_line Clip pelem against an arbitrary line
+* pelem_clip_line Clip pelem against an arbitrary line
*
* SYNOPSIS
* pelem_clip_line (pelem, x1, y1, x2, y2)
-* PhantomElement& pelem; Pelem to be clipped
-* double *x1, *y1, *x2, *y2 Endpoints of line to be clipped
+* PhantomElement& pelem; Pelem to be clipped
+* double *x1, *y1, *x2, *y2 Endpoints of line to be clipped
*
* RETURNS
* true if line passes through pelem
-* (x1, y1, x2, y2 hold coordinates of new line)
+* (x1, y1, x2, y2 hold coordinates of new line)
* false if line do not pass through pelem
-* (x1, y1, x2, y2 are undefined)
+* (x1, y1, x2, y2 are undefined)
*/
bool
PhantomElement::clipLineNormalizedCoords (double& x1, double& y1, double& x2, double& y2) const
{
bool accept = false;
-
+
switch (m_type) {
case PELEM_RECTANGLE:
double rect[4];
sys_error (ERR_WARNING, "Illegal pelem type %d [pelem_clip_line]", m_type);
break;
}
-
+
return(accept);
}
-// METHOD IDENTIFICATION
-// PhantomElement::isPointInside Check if point is inside pelem
+// METHOD IDENTIFICATION
+// PhantomElement::isPointInside Check if point is inside pelem
//
// SYNOPSIS
// is_point_inside (pelem, x, y, coord_type)
-// double x, y Point to see if lies in pelem
-// int coord_type Coordinate type (PELEM_COORD or PHM_COORD)
+// double x, y Point to see if lies in pelem
+// int coord_type Coordinate type (PELEM_COORD or PHM_COORD)
//
// RETURNS
// true if point lies within pelem
sys_error(ERR_WARNING, "Illegal coordinate type in pelem_is_point_inside");
return (false);
}
-
+
switch (m_type) {
case PELEM_RECTANGLE:
if (x > 1. || x < -1. || y > 1. || y < -1.)
case PELEM_ELLIPSE:
if (x > 1. || x < -1. || y > 1. || y < -1.)
return (false);
- if (x * x + y * y > 1.) // check if inside unit circle
+ if (x * x + y * y > 1.) // check if inside unit circle
return (false);
else
return (true);
break;
-
+
// for clipping segments & sectors, must NOT scale by (1/u, 1/v)
- // because this destroys information about size of arc component
-
+ // because this destroys information about size of arc component
+
case PELEM_SEGMENT:
if (x > 1. || x < -1. || y > 0.)
- return (false); // clip against y > 0
- x *= m_u; // put back u & v scale
+ return (false); // clip against y > 0
+ x *= m_u; // put back u & v scale
y *= m_v;
if (x * x + (y-m_v) * (y-m_v) > m_u * m_u + m_v * m_v)
- return (false); // clip against circle, r = sqrt(@)
+ return (false); // clip against circle, r = sqrt(@)
else
return (true);
break;
case PELEM_SECTOR:
- if (x > 1. || x < -1. || y > 1.) // extent
+ if (x > 1. || x < -1. || y > 1.) // extent
return (false);
- if (y > 1. - x || y > 1. + x) // triangle
- return (false); // clip against triangle
- x *= m_u; // circle: put back u & v scale
+ if (y > 1. - x || y > 1. + x) // triangle
+ return (false); // clip against triangle
+ x *= m_u; // circle: put back u & v scale
y *= m_v;
if (x * x + (y-m_v) * (y-m_v) > m_u * m_u + m_v * m_v)
- return (false); // clip against circle
+ return (false); // clip against circle
else
return (true);
break;
sys_error (ERR_WARNING, "Illegal pelem type in pelem_is_point_inside()");
break;
}
-
+
return (false);
}
projects / ctsim.git / blobdiff