Added ripples magic.

Added (not finished) (new) sparkles magic.
Fixed printf localization bug in postscript printing.
Got Text tool working when Pango is used.

magic/src/ripples.c

@@ -0,0 +1,149 @@
+#include <stdio.h>
+#include <string.h>
+#include <libintl.h>
+#include "tp_magic_api.h"
+#include "SDL_image.h"
+#include "SDL_mixer.h"
+
+#include <math.h>
+
+/* Our globals: */
+
+Mix_Chunk * ripples_snd;
+
+int ripples_z, ripples_brite;
+
+Uint32 ripples_api_version(void) { return(TP_MAGIC_API_VERSION); }
+
+#define deg_cos(x) cos((x) * M_PI / 180.0)
+#define deg_sin(x) sin((x) * M_PI / 180.0)
+
+// No setup required:
+int ripples_init(magic_api * api)
+{
+  char fname[1024];
+
+  snprintf(fname, sizeof(fname), "%s/sounds/magic/ripples.wav",
+	    api->data_directory);
+  ripples_snd = Mix_LoadWAV(fname);
+
+  return(1);
+}
+
+// We have multiple tools:
+int ripples_get_tool_count(magic_api * api)
+{
+  return(1);
+}
+
+// Load our icons:
+SDL_Surface * ripples_get_icon(magic_api * api, int which)
+{
+  char fname[1024];
+
+  snprintf(fname, sizeof(fname), "%s/images/magic/ripples.png",
+	   api->data_directory);
+
+  return(IMG_Load(fname));
+}
+
+// Return our names, localized:
+char * ripples_get_name(magic_api * api, int which)
+{
+  return(strdup(gettext("Ripples")));
+}
+
+// Return our descriptions, localized:
+char * ripples_get_description(magic_api * api, int which)
+{
+  return(strdup(gettext("Click to make ripples appear over your picture.")));
+}
+
+// Affect the canvas on drag:
+void ripples_drag(magic_api * api, int which, SDL_Surface * canvas,
+	          SDL_Surface * last, int ox, int oy, int x, int y,
+		  SDL_Rect * update_rect)
+{
+}
+
+void ripples_linecb(void * ptr, int which,
+                    SDL_Surface * canvas, SDL_Surface * last,
+                    int x, int y)
+{
+  magic_api * api = (magic_api *) ptr;
+  Uint8 r, g, b;
+  Uint32 pix;
+
+  pix = api->getpixel(last, x + ripples_z, y + ripples_z);
+  SDL_GetRGB(pix, last->format, &r, &g, &b);
+
+  r = max(0, min(255, r + ripples_brite));
+  g = max(0, min(255, g + ripples_brite));
+  b = max(0, min(255, b + ripples_brite));
+
+  api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, r, g, b));
+}
+
+// Affect the canvas on click:
+void ripples_click(magic_api * api, int which,
+	           SDL_Surface * canvas, SDL_Surface * last,
+	           int x, int y, SDL_Rect * update_rect)
+{
+  float radius;
+  float fli;
+  int ox, oy, nx, ny, d;
+
+  radius = 100;
+
+  for (fli = 0; fli < radius; fli = fli + .25)
+  {
+    ripples_z = (10 * deg_sin(((50 * 50) / (fli + 4)) * 10));
+	  
+    ox = fli * deg_cos(0) + x;
+    oy = -fli * deg_sin(0) + y;
+	  
+    for (d = 0; d <= 360 + (360 / (fli + 1)); d = d + 360 / (fli + 1))
+    {
+      nx = fli * deg_cos(d) + x;
+      ny = -fli * deg_sin(d) + y;
+	      
+      ripples_brite = (ripples_z * 20 * deg_sin(d + 45)) / ((fli / 4) + 1);
+
+      api->line(which, canvas, last, ox, oy, nx, ny, 1, ripples_linecb);
+	      
+      ox = nx;
+      oy = ny;
+    }
+  }
+
+  update_rect->x = x - 100;
+  update_rect->y = y - 100;
+  update_rect->w = 200;
+  update_rect->h = 200;
+}
+
+// Affect the canvas on release:
+void ripples_release(magic_api * api, int which,
+	           SDL_Surface * canvas, SDL_Surface * last,
+	           int x, int y, SDL_Rect * update_rect)
+{
+}
+
+// No setup happened:
+void ripples_shutdown(magic_api * api)
+{
+  if (ripples_snd != NULL)
+    Mix_FreeChunk(ripples_snd);
+}
+
+// Record the color from Tux Paint:
+void ripples_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
+{
+}
+
+// Use colors:
+int ripples_requires_colors(magic_api * api, int which)
+{
+  return 0;
+}
+