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ppmdraw.h
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/* ppmdraw.h - header file for simple drawing routines in libppm ** ** Simple, yes, and also fairly slow if the truth be told; but also very ** flexible and powerful. ** ** The two basic concepts are the drawproc and clientdata. All the drawing ** routines take a drawproc that does the actual drawing. A drawproc draws ** a single point, and it looks like this: */ #include <netpbm/pm_config.h> #include <netpbm/ppm.h> #ifdef __cplusplus extern "C" { #endif #if 0 } /* to fake out automatic code indenters */ #endif typedef struct { int x; int y; } ppmd_point; static __inline__ ppmd_point ppmd_makePoint(int const x, int const y) { ppmd_point p; p.x = x; p.y = y; return p; } void ppmd_validateCoord(int const c); void ppmd_validatePoint(ppmd_point const p); typedef enum { PPMD_PATHLEG_LINE } ppmd_pathlegtype; struct ppmd_linelegparms { ppmd_point end; }; typedef struct { /*---------------------------------------------------------------------------- A leg of a ppmd_path. -----------------------------------------------------------------------------*/ ppmd_pathlegtype type; union { struct ppmd_linelegparms linelegparms; } u; } ppmd_pathleg; ppmd_pathleg ppmd_makeLineLeg(ppmd_point const point); typedef struct { /*---------------------------------------------------------------------------- A closed path -----------------------------------------------------------------------------*/ unsigned int version; /* Must be zero. For future expansion. */ ppmd_point begPoint; unsigned int legCount; /* Number of legs in the path; i.e. size of 'legs' array */ size_t legSize; /* Size of storage occupied by one ppmd_pathleg. I.e. sizeof(ppmd_pathleg). Used for binary backward compatibility between callers and libppmd as the definition of ppmd_pathleg changes. */ ppmd_pathleg * legs; /* An array of the legs of the path, in order, starting at 'begPoint'. */ } ppmd_path; typedef struct { ppmd_path path; /* The path we are building (or have built). Null for path.legs means we don't have a leg array yet. */ bool begIsSet; /* User has set path.begPoint. If this is false, path.begPoint is meaningless. */ unsigned int legsAllocSize; /* How many legs of space is allocated in the leg array path.legs */ bool legsAreAutoAllocated; /* The array 'legs' is allocated or reallocated automatically by ppmd_path_addlineline(), as opposed to being supplied by the user as part of initializing this structure, never to be altered. */ } ppmd_pathbuilder; ppmd_pathbuilder * ppmd_pathbuilder_create(void); void ppmd_pathbuilder_destroy(ppmd_pathbuilder * const pathBuilderP); void ppmd_pathbuilder_setLegArray(ppmd_pathbuilder * const pathBuilderP, ppmd_pathleg * const legs, unsigned int const legCount); void ppmd_pathbuilder_preallocLegArray(ppmd_pathbuilder * const pathBuilderP, unsigned int const legCount); void ppmd_pathbuilder_setBegPoint(ppmd_pathbuilder * const pathBuilderP, ppmd_point const begPoint); void ppmd_pathbuilder_addLineLeg(ppmd_pathbuilder * const pathBuilderP, ppmd_pathleg const leg); const ppmd_path * ppmd_pathbuilder_pathP(ppmd_pathbuilder * const pathBuilderP); typedef void ppmd_drawprocp(pixel **, unsigned int, unsigned int, pixval, ppmd_point, const void *); typedef void ppmd_drawproc(pixel **, int, int, pixval, int, int, const void *); ppmd_drawprocp ppmd_point_drawprocp; ppmd_drawproc ppmd_point_drawproc; /* ** So, you call a drawing routine, e.g. ppmd_line(), and pass it a drawproc; ** it calls the drawproc for each point it wants to draw. Why so complicated? ** Because you can define your own drawprocs to do more interesting things than ** simply draw the point. For example, you could make one that calls back into ** another drawing routine, say ppmd_circle() to draw a circle at each point ** of a line. ** ** Slow? Well sure, we're talking results here, not realtime. You can do ** tricks with this arrangement that you couldn't even think of before. ** Still, to speed things up for the 90% case you can use this: */ #define PPMD_NULLDRAWPROC NULL /* ** Just like ppmd_point_drawproc() it simply draws the point, but it's done ** inline, and clipping is assumed to be handled at a higher level. ** ** Now, what about clientdata. Well, it's an arbitrary pointer, and can ** mean something different to each different drawproc. For the above two ** drawprocs, clientdata should be a pointer to a pixel holding the color ** to be drawn. Other drawprocs can use it to point to something else, ** e.g. some structure to be modified, or they can ignore it. */ /* Outline drawing routines. Lines, splines, circles, etc. */ int ppmd_setlinetype(int const type); #define PPMD_LINETYPE_NORMAL 0 #define PPMD_LINETYPE_NODIAGS 1 /* If you set NODIAGS, all pixels drawn by ppmd_line() will be 4-connected ** instead of 8-connected; in other words, no diagonals. This is useful ** for some applications, for example when you draw many parallel lines ** and you want them to fit together without gaps. */ int ppmd_setlineclip(int const clip); #define ppmd_setlineclipping(x) ppmd_setlineclip(x) /* Normally, ppmd_line() clips to the edges of the pixmap. You can use this ** routine to disable the clipping, for example if you are using a drawproc ** that wants to do its own clipping. */ void ppmd_linep(pixel ** const pixels, int const cols, int const rows, pixval const maxval, ppmd_point const p0, ppmd_point const p1, ppmd_drawprocp drawProc, const void * const clientdata); /* Draws a line from p0 to p1. */ void ppmd_line(pixel** const pixels, int const cols, int const rows, pixval const maxval, int const x0, int const y0, int const x1, int const y1, ppmd_drawproc drawproc, const void * const clientdata); /* Draws a line from (x0, y0) to (x1, y1). */ void ppmd_spline3p(pixel ** const pixels, int const cols, int const rows, pixval const maxval, ppmd_point const p0, ppmd_point const p1, ppmd_point const p2, ppmd_drawprocp drawProc, const void * const clientdata); /* Draws a three-point spline from p0 to p2, with p1 as the control point. All drawing is done via ppmd_linep(), so the routines that control it control ppmd_spline3p() as well. */ void ppmd_spline3(pixel ** const pixels, int const cols, int const rows, pixval const maxval, int const x0, int const y0, int const x1, int const y1, int const x2, int const y2, ppmd_drawproc drawproc, const void * const clientdata); void ppmd_polysplinep(pixel ** const pixels, unsigned int const cols, unsigned int const rows, pixval const maxval, ppmd_point const p0, unsigned int const nc, ppmd_point * const c, ppmd_point const p1, ppmd_drawprocp drawProc, const void * const clientdata); /* Draws a bunch of splines end to end. p0 and p1 are the initial and final points, and the c[] are the intermediate control points. nc is the number of these control points. */ void ppmd_polyspline(pixel ** const pixels, int const cols, int const rows, pixval const maxval, int const x0, int const y0, int const nc, int * const xc, int * const yc, int const x1, int const y1, ppmd_drawproc drawProc, const void * const clientdata); void ppmd_spline4p(pixel ** const pixels, unsigned int const cols, unsigned int const rows, pixval const maxval, ppmd_point const endPt0, ppmd_point const endPt1, ppmd_point const ctlPt0, ppmd_point const ctlPt1, ppmd_drawprocp drawproc, const void * const clientdata); void ppmd_circlep(pixel ** const pixels, unsigned int const cols, unsigned int const rows, pixval const maxval, ppmd_point const center, unsigned int const radius, ppmd_drawprocp drawProc, const void * const clientData); /* Draws a circle centered at 'center' with radius 'radius' */ void ppmd_circle(pixel ** const pixels, int const cols, int const rows, pixval const maxval, int const cx, int const cy, int const radius, ppmd_drawproc drawProc, const void * const clientdata); /* Simple filling routines. */ void ppmd_filledrectangle(pixel ** const pixels, int const cols, int const rows, pixval const maxval, int const x, int const y, int const width, int const height, ppmd_drawproc drawproc, const void * const clientdata ); /* Fills in the rectangle [x, y, width, height]. */ void ppmd_fill_path(pixel ** const pixels, int const cols, int const rows, pixval const maxval, const ppmd_path * const pathP, pixel const color); /* Fills in a closed path. Not much different from ppmd_fill(), but with a different interface. */ /* Arbitrary filling routines. With these you can fill any outline that ** you can draw with the outline routines. */ struct fillobj; struct fillobj * ppmd_fill_create(void); /* Returns a blank fillhandle. */ void ppmd_fill_destroy(struct fillobj * fillObjP); /* For backward compatibility only: */ char * ppmd_fill_init(void); void ppmd_fill_drawprocp(pixel ** const pixels, unsigned int const cols, unsigned int const rows, pixval const maxval, ppmd_point const p, const void * const clientdata); /* Use this drawproc to trace the outline you want filled. Use the fillhandle as the clientdata. */ void ppmd_fill_drawproc(pixel ** const pixels, int const cols, int const rows, pixval const maxval, int const x, int const y, const void * const clientdata); void ppmd_fill(pixel ** const pixels, int const cols, int const rows, pixval const maxval, struct fillobj * const fh, ppmd_drawproc drawProc, const void * const clientdata); /* Once you've traced the outline, give the fillhandle to this routine to ** do the actual drawing. As usual, it takes a drawproc and clientdata; ** you could define drawprocs to do stipple fills and such. */ /* Text drawing routines. */ void ppmd_textp(pixel** const pixels, int const cols, int const rows, pixval const maxval, ppmd_point const pos, int const height, int const angle, const char * const sArg, ppmd_drawprocp drawProc, const void * const clientdata); void ppmd_text(pixel** const pixels, int const cols, int const rows, pixval const maxval, int const xpos, int const ypos, int const height, int const angle, const char * const sArg, ppmd_drawproc drawProc, const void * const clientdata); /* Draws the null-terminated string 's' left justified at the point ('x', 'y'). The text will be 'height' pixels high and will be aligned on a baseline inclined 'angle' degrees with the X axis. The supplied drawproc and clientdata are passed to ppmd_line() which performs the actual drawing. */ void ppmd_text_box(int const height, int const angle, const char * const s, int * const leftP, int * const topP, int * const rightP, int * const bottomP); /* Calculates the extents box for text drawn by ppm_text with the given string, size, and orientation. Most extent box calculations should use an angle specification of zero to calculate the unrotated box enclosing the text. If you need the extents of rotated text, however, you can call ppmd_text_box with a nonzero angle. */ #ifdef __cplusplus } #endif