fish/surf/bezpt.h

   1 #include "fasttrig.h"
   2 /*
   3  * structures and such for manipulating bezier curves
   4  */
   5
   6 #define MaxSegs  50  /* max number of bezier segments */
   7
   8 typedef struct {
   9     int prev2;  /* second control point of segment n-1 */
  10     int cur0;   /* begin of segment n, end of segment n-1 */
  11     int cur1;   /* first control point of segment n */
  12 } BezVal;
  13
  14
  15 typedef struct {
  16     BezVal  x, y;
  17 } BezCoord;
  18
  19 #define DefBezMeshVal 10
  20
  21 extern BezCoord Bezpt[MaxSegs+1];
  22 extern void SetBezMesh( /* Panel_item, int, struct input_event */);
  23 extern int BezMesh;
  24 extern float BezStepSize;
  25
  26 extern void InitCalcBez( /* void */ );
  27 extern void CalcBezPt(/* float, float *, float * */);
  28 extern void XdrawAllBezSegs(/* void */);
  29 extern void XdrawBezSeg(/* void */);
  30 extern void InitBezPt( /* int, int */);
  31 extern void EditBezPt( /* int, int */);
  32 extern void ResetCurve( /* void */ );
  33
  34 extern int NumBezPts;
  35 extern int ActSeg;
  36 #define BezRings() (GetNumSegs() * BezMesh + 1)
  37 #define GetFirstSeg()   (0)
  38 #define GetNumSegs()    (NumBezPts-1)
  39 #define ResetActSeg()   { ActSeg = GetFirstSeg(); }
  40 #define GetCurSeg()     (ActSeg)
  41 #define PrevSegNo()   (ActSeg -1 < 0 ? GetNumSegs(): ActSeg -1 )
  42 #define PrevSeg()   { ActSeg = PrevSegNo(); }
  43 #define NextSegNo() ((ActSeg+1) % GetNumSegs())
  44 #define NextSeg()       { ActSeg = NextSegNo(); }
  45
  46 enum BezPtEnum { BPEStartPt, BPEEndPt, BPECntrlPt1, BPECntrlPt2 };
  47
  48 #define StartPtX(XSegNo) Bezpt[XSegNo].x.cur0
  49 #define StartPtY(XSegNo) Bezpt[XSegNo].y.cur0
  50
  51 #define Cntrl1X(XSegNo) Bezpt[XSegNo].x.cur1
  52 #define Cntrl1Y(XSegNo) Bezpt[XSegNo].y.cur1
  53
  54 #define Cntrl2X(XSegNo) Bezpt[XSegNo+1].x.prev2
  55 #define Cntrl2Y(XSegNo) Bezpt[XSegNo+1].y.prev2
  56
  57 #define EndPtX(XSegNo) Bezpt[XSegNo+1].x.cur0
  58 #define EndPtY(XSegNo) Bezpt[XSegNo+1].y.cur0
  59
  60 #define DrawStartPt() DrawBox( Bezpt[ActSeg].x.cur0, \
  61                                Bezpt[ActSeg].y.cur0, XOR )
  62
  63 #define DrawEndPt() DrawBox( Bezpt[ActSeg+1].x.cur0, \
  64                                Bezpt[ActSeg+1].y.cur0, XOR )
  65
  66 #define DrawControl0() DrawSqr( Bezpt[ActSeg].x.cur1,\
  67                                 Bezpt[ActSeg].y.cur1, XOR )
  68
  69 #define DrawControl1() DrawSqr( Bezpt[ActSeg+1].x.prev2,\
  70                                 Bezpt[ActSeg+1].y.prev2, XOR )
  71