apdf/splash/SplashPath.h

   1 //========================================================================
   2 //
   3 // SplashPath.h
   4 //
   5 //========================================================================
   6
   7 #ifndef SPLASHPATH_H
   8 #define SPLASHPATH_H
   9
  10 #include <aconf.h>
  11
  12 #ifdef USE_GCC_PRAGMAS
  13 #pragma interface
  14 #endif
  15
  16 #include "SplashTypes.h"
  17
  18 //------------------------------------------------------------------------
  19 // SplashPathPoint
  20 //------------------------------------------------------------------------
  21
  22 struct SplashPathPoint {
  23   SplashCoord x, y;
  24 };
  25
  26 //------------------------------------------------------------------------
  27 // SplashPath.flags
  28 //------------------------------------------------------------------------
  29
  30 // first point on each subpath sets this flag
  31 #define splashPathFirst  0x01
  32
  33 // last point on each subpath sets this flag
  34 #define splashPathLast   0x02
  35
  36 // if the subpath is closed, its first and last points must be
  37 // identical, and must set this flag
  38 #define splashPathClosed 0x04
  39
  40 // curve control points set this flag
  41 #define splashPathCurve  0x08
  42
  43 // clockwise arc center points set this flag
  44 #define splashPathArcCW  0x10
  45
  46 //------------------------------------------------------------------------
  47 // SplashPath
  48 //------------------------------------------------------------------------
  49
  50 class SplashPath {
  51 public:
  52
  53   // Create an empty path.
  54   SplashPath();
  55
  56   // Copy a path.
  57   SplashPath *copy() { return new SplashPath(this); }
  58
  59   ~SplashPath();
  60
  61   // Append <path> to <this>.
  62   void append(SplashPath *path);
  63
  64   // Start a new subpath.
  65   SplashError moveTo(SplashCoord x, SplashCoord y);
  66
  67   // Add a line segment to the last subpath.
  68   SplashError lineTo(SplashCoord x, SplashCoord y);
  69
  70   // Add a third-order (cubic) Bezier curve segment to the last
  71   // subpath.
  72   SplashError curveTo(SplashCoord x1, SplashCoord y1,
  73                       SplashCoord x2, SplashCoord y2,
  74                       SplashCoord x3, SplashCoord y3);
  75
  76   // Add a clockwise circular arc with center (xc, yc) and endpoint
  77   // (x1, y1).
  78   SplashError arcCWTo(SplashCoord x1, SplashCoord y1,
  79                       SplashCoord xc, SplashCoord yc);
  80
  81   // Close the last subpath, adding a line segment if necessary.
  82   SplashError close();
  83
  84   // Add (<dx>, <dy>) to every point on this path.
  85   void offset(SplashCoord dx, SplashCoord dy);
  86
  87   // Get the points on the path.
  88   int getLength() { return length; }
  89   void getPoint(int i, double *x, double *y, Guchar *f)
  90     { *x = pts[i].x; *y = pts[i].y; *f = flags[i]; }
  91
  92   // Get the current point.
  93   GBool getCurPt(SplashCoord *x, SplashCoord *y);
  94
  95 private:
  96
  97   SplashPath(SplashPath *path);
  98   void grow(int nPts);
  99   GBool noCurrentPoint() { return curSubpath == length; }
 100   GBool onePointSubpath() { return curSubpath == length - 1; }
 101   GBool openSubpath() { return curSubpath < length - 1; }
 102
 103   SplashPathPoint *pts;         // array of points
 104   Guchar *flags;                // array of flags
 105   int length, size;             // length/size of the pts and flags arrays
 106   int curSubpath;               // index of first point in last subpath
 107
 108   friend class SplashXPath;
 109   friend class Splash;
 110 };
 111
 112 #endif