Added GIFPlot example

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@219 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/GIFPlot/Lib/color.c

@@ -0,0 +1,140 @@
+/* ----------------------------------------------------------------------------- 
+ * color.c
+ *
+ *     Colormaps
+ * 
+ * Author(s) : David Beazley (beazley@cs.uchicago.edu)
+ * Copyright (C) 1995-1996
+ *
+ * See the file LICENSE for information on usage and redistribution.	
+ * ----------------------------------------------------------------------------- */
+
+#define COLORMAP
+#include "gifplot.h"
+#include <string.h>
+
+/* ------------------------------------------------------------------------
+   ColorMap *new_ColorMap(char *filename)
+
+   Read a colormap from a file.
+   ------------------------------------------------------------------------ */
+
+ColorMap *new_ColorMap(char *filename) {
+  ColorMap *c;
+  FILE *cm;
+  void ColorMap_default(ColorMap *);
+  
+  if (!filename) {
+    c = (ColorMap *) malloc(sizeof(ColorMap));
+    c->cmap = (unsigned char *) malloc(768*sizeof(char));
+    c->name = 0;
+    ColorMap_default(c);
+    return c;
+  }
+  if (strlen(filename) == 0) {
+    c = (ColorMap *) malloc(sizeof(ColorMap));
+    c->cmap = (unsigned char *) malloc(768*sizeof(char));
+    ColorMap_default(c);
+    return c;
+  }
+  if ((cm = fopen(filename,"rb")) == NULL) {
+    return (ColorMap *) 0;
+  }
+  c = (ColorMap *) malloc(sizeof(ColorMap));
+  c->cmap = (unsigned char *) malloc(768*sizeof(char));
+  if (fread(c->cmap, 768, 1, cm) != 1) {
+    free((char *)c->cmap);
+    free((char *)c);
+    fclose(cm);
+    return (ColorMap *) 0;
+  }
+  fclose(cm);
+  c->name = (char *) malloc(strlen(filename)+1);
+  strcpy(c->name, filename);
+  ColorMap_default(c);
+  return c;
+}
+
+/* --------------------------------------------------------------------------
+   delete_ColorMap(ColorMap *cm)
+
+   Destroy a ColorMap
+   -------------------------------------------------------------------------- */
+
+void delete_ColorMap(ColorMap *cm) {
+  if (cm) {
+    free((char *)cm->cmap);
+    if (cm->name)
+      free((char *)cm->name);
+    free((char *)cm);
+  }
+}
+
+/* --------------------------------------------------------------------------
+   ColorMap_default(ColorMap *cm)
+
+   This function fills in default values for the first 8 entries of the
+   colormap.  These are *fixed* values---used internally.
+   -------------------------------------------------------------------------- */
+
+void ColorMap_default(ColorMap *cm) {
+  unsigned char *r,*g,*b;
+  if (cm) {
+    r = cm->cmap;
+    g = cm->cmap+256;
+    b = cm->cmap+512;
+
+    r[0] = 0;   g[0] = 0;   b[0] = 0;      /* BLACK */
+    r[1] = 255; g[1] = 255; b[1] = 255;    /* WHITE */
+    r[2] = 255; g[2] = 0;   b[2] = 0;      /* RED   */
+    r[3] = 0;   g[3] = 255; b[3] = 0;      /* GREEN */
+    r[4] = 0;   g[4] = 0;   b[4] = 255;    /* BLUE  */
+    r[5] = 255; g[5] = 255; b[5] = 0;      /* YELLOW */
+    r[6] = 0;   g[6] = 255; b[6] = 255;    /* CYAN   */
+    r[7] = 255; g[7] = 0;   b[7] = 255;    /* MAGENTA */
+  }
+}
+
+void ColorMap_assign(ColorMap *cm, int index, int r, int g, int b) {
+  unsigned char *rb,*gb,*bb;
+
+  rb = cm->cmap;
+  gb = cm->cmap+256;
+  bb = cm->cmap+512;
+
+  rb[index] = r;
+  gb[index] = g;
+  bb[index] = b;
+}
+
+int ColorMap_getitem(ColorMap *cm, int index) {
+  if ((index < 0) && (index >= 768)) return -1;
+  return cm->cmap[index];
+}
+
+void ColorMap_setitem(ColorMap *cm, int index, int value) {
+  if ((index < 0) && (index >= 768)) return;
+  cm->cmap[index]=value;
+}  
+
+/* --------------------------------------------------------------------
+   ColorMap_write(ColorMap *cm, char *filename)
+
+   Write out a colormap to disk.
+   -------------------------------------------------------------------- */
+
+int ColorMap_write(ColorMap *cm, char *filename) {
+
+  FILE *f;
+  if (!cm) return -1;
+  if (!filename) return -1;
+  if (strlen(filename) == 0) return -1;
+
+  f = fopen(filename,"w");
+  
+  fwrite(cm->cmap,768,1,f);
+  fclose(f);
+  return 0;
+}
+
+#undef COLORMAP