first start of fallin' demo

doc/man/man1/notcurses-demo.1.md

@@ -56,7 +56,7 @@ At any time, press 'q' to quit. The demo is best run in at least a 80x45 termina
 
 **-V**: Print the program name and version, and exit with success.
 
-demospec: Select which demos to run, and what order to run them in. The default is **ixetcgswubvlpo**. See above for a list of demos.
+demospec: Select which demos to run, and what order to run them in. The default is **ixetcgpwubvlfso**. See above for a list of demos.
 
 # NOTES
 Proper display requires:

src/demo/demo.c

@@ -21,7 +21,7 @@ static demoresult* results;
 static char datadir[PATH_MAX];
 static atomic_bool interrupted = ATOMIC_VAR_INIT(false);
 
-static const char DEFAULT_DEMO[] = "ixetcgswubvlpo";
+static const char DEFAULT_DEMO[] = "ixetcgpwubvlfso";
 
 void interrupt_demo(void){
   atomic_store(&interrupted, true);
@@ -201,7 +201,7 @@ static const char* demonames[26] = {
   "chunli",
   "",
   "eagle",
-  "",
+  "fallin",
   "grid",
   "",
   "intro",
@@ -259,6 +259,7 @@ ext_demos(struct notcurses* nc, const char* demos){
       case 'c': ret = chunli_demo(nc); break;
       case 'g': ret = grid_demo(nc); break;
       case 'l': ret = luigi_demo(nc); break;
+      case 'f': ret = fallin_demo(nc); break;
       case 'v': ret = view_demo(nc); break;
       case 'e': ret = eagle_demo(nc); break;
       case 'x': ret = xray_demo(nc); break;

src/demo/fallin.c

@@ -1,6 +1,27 @@
 #include "demo.h"
 
 int fallin_demo(struct notcurses* nc){
-
+  // make a copy of the standard plane so that we don't need rederive the
+  // world in the event of a resize event
+  struct ncplane* ndup = ncplane_dup(notcurses_stdplane(nc), NULL);
+  if(!ndup){
+    return -1;
+  }
+  ncplane_erase(notcurses_stdplane(nc));
+  int dimx, dimy, atotal;
+  ncplane_dim_yx(ndup, &dimy, &dimx);
+  atotal = dimy * dimx;
+  // FIXME shuffle up a list of all coordinates, then walk through them. each
+  // one ought be turned into its own small ncplane, erased from ndup, and the
+  // plane set falling.
+  while(atotal--){
+    if(notcurses_render(nc)){
+      ncplane_destroy(ndup);
+      return -1;
+    }
+  }
+  if(ncplane_destroy(ndup)){
+    return -1;
+  }
   return 0;
 }

src/poc/visual.cpp

@@ -0,0 +1,40 @@
+#include <cstdio>
+#include <cstdlib>
+#include <clocale>
+#include <cassert>
+#include <unistd.h>
+#include <notcurses.h>
+
+int main(int argc, char** argv){
+  setlocale(LC_ALL, "");
+  notcurses_options opts{};
+  opts.inhibit_alternate_screen = true;
+  struct notcurses* nc;
+  if((nc = notcurses_init(&opts, stdout)) == nullptr){
+    return EXIT_FAILURE;
+  }
+  struct ncplane* n = notcurses_stdplane(nc);
+  int dimx, dimy;
+  ncplane_dim_yx(n, &dimy, &dimx);
+
+  int averr;
+  auto ncv = ncplane_visual_open(n, "../data/dsscaw-purp.png", &averr);
+  if(!ncv){
+    goto err;
+  }
+  if(!ncvisual_decode(ncv, &averr)){
+    goto err;
+  }
+  if(ncvisual_render(ncv, 0, 0, 0, 0)){
+    goto err;
+  }
+  if(notcurses_render(nc)){
+    goto err;
+  }
+  sleep(1);
+  return notcurses_stop(nc) ? EXIT_FAILURE : EXIT_SUCCESS;
+
+err:
+  notcurses_stop(nc);
+  return EXIT_FAILURE;
+}