PostScriptBezier

Syntax

int PostScriptBezier(struct PostScript *ptr, float x1,float y1,float x2,float y2,float x3,float y3, float x4,float y4, unsigned int color,float width, struct PostScriptDash *dash,struct PostScriptClip *clip);

Header

base/rps.h

Library

rps

Description

The PostScriptBezier function plots a bezier curve.

The argument ptr is a pointer to the PostScript control structure.

The coordinates of the four points that define the bezier curve are given by the arguments x1, y1,x2, y2,x2, y3, and x4, y4. The two end points are defined by x1, y1 and x4,y4. The other two coordinates are the control points.

The color used to plot the curve is given by the color which is a 24-bit number that represents the red,green and blue components of the color as 8-bit numbers. The red channel occupies the most significant bits and the blue channel occupies the least significant bits.

The width of the line used to plot the curve is controlled using the argument width, a value of zero will plot a hairline. The dot-dash pattern is given by dash. If this is set to a NULL pointer, a solid line is plotted.

The clipping polygon is given by the argument clip. If this is set to a NULL pointer, no clipping is performed.

Returns

Returns zero on success. On error, (-1) is returned.

Errors

On error, (-1) is returned.

Example

PostScriptBezier
Source Code: PostScriptBezier.c

/* PostScriptBezier.c
   ==================
   Author: R.J.Barnes
 Copyright (c) 2012 The Johns Hopkins University/Applied Physics Laboratory

This file is part of the Radar Software Toolkit (RST).

RST is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

Modifications:




#include <stdio.h>
#include <stdlib.h>
#include "rfbuffer.h"
#include "rps.h"

int stream(char *buf,int sze,void *data) {
  FILE *fp;
  fp=(FILE *) data;
  fwrite(buf,sze,1,stdout);
  return 0;
} 


int main(int argc,char *argv[]) {

  struct PostScript *ps=NULL;

  float wdt=400,hgt=400;
  float xoff=50,yoff=50;

  unsigned int fgcol=0xff000000;

  ps=PostScriptMake();
  PostScriptSetText(ps,stream,stdout);   
  PostScriptMakeDocument(ps,xoff,yoff,wdt,hgt,0);
  PostScriptMakePlot(ps);

  PostScriptBezier(ps,20,20,0,hgt/2,wdt,hgt/2,wdt-20,hgt-20,
              fgcol,1.0,NULL,NULL);

  PostScriptEndPlot(ps);
  PostScriptEndDocument(ps);
  return 0;
}