From 7173f628ee6034326416f794e3f2b9bcd355f501 Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Sun, 24 Nov 2019 21:10:54 -0500
Subject: [PATCH] griddemo: inverse

---
 src/bin/grid.c | 81 +++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 74 insertions(+), 7 deletions(-)

diff --git a/src/bin/grid.c b/src/bin/grid.c
index 729a0b4f7..34ff018b7 100644
--- a/src/bin/grid.c
+++ b/src/bin/grid.c
@@ -1,6 +1,70 @@
 #include <unistd.h>
 #include "demo.h"
 
+static int
+gridinv_demo(struct notcurses* nc, struct ncplane *n,
+             cell* ul, cell* uc, cell* ur,
+             cell* cl, cell* cc, cell* cr,
+             cell* ll, cell* lc, cell* lr){
+  int maxx, maxy;
+  notcurses_term_dimyx(nc, &maxy, &maxx);
+  int rs = 256 / maxx;
+  int gs = 256 / (maxx + maxy);
+  int bs = 256 / maxy;
+  int x = 0;
+  int y = 0;
+  if(ncplane_cursor_move_yx(n, y, x)){
+    return -1;
+  }
+  // top line
+  cell_set_fg(ul, 0, 0, 0);
+  cell_set_bg(ul, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+  ncplane_putc(n, ul);
+  for(x = 1 ; x < maxx - 1 ; ++x){
+    cell_set_fg(uc, 0, 0, 0);
+    cell_set_bg(uc, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+    ncplane_putc(n, uc);
+  }
+  cell_set_fg(ur, 0, 0, 0);
+  cell_set_bg(ur, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+  ncplane_putc(n, ur);
+
+  // center
+  x = 0;
+  for(y = 1 ; y < maxy - 1 ; ++y){
+    cell_set_fg(cl, 0, 0, 0);
+    cell_set_bg(cl, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+    ncplane_putc(n, cl);
+    for(x = 1 ; x < maxx - 1 ; ++x){
+      cell_set_fg(cc, 0, 0, 0);
+      cell_set_bg(cc, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+      ncplane_putc(n, cc);
+    }
+    cell_set_fg(cr, 0, 0, 0);
+    cell_set_bg(cr, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+    ncplane_putc(n, cr);
+  }
+
+  // bottom line
+  x = 0;
+  cell_set_fg(ll, 0, 0, 0);
+  cell_set_bg(ll, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+  ncplane_putc(n, ll);
+  for(x = 1 ; x < maxx - 1 ; ++x){
+    cell_set_fg(lc, 0, 0, 0);
+    cell_set_bg(lc, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+    ncplane_putc(n, lc);
+  }
+  cell_set_fg(lr, 0, 0, 0);
+  cell_set_bg(lr, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
+  ncplane_putc(n, lr);
+
+  // render!
+  notcurses_render(nc);
+  sleep(1);
+  return 0;
+}
+
 // red across, blue down, green from UL to LR
 int grid_demo(struct notcurses* nc){
   int maxx, maxy;
@@ -33,39 +97,42 @@ int grid_demo(struct notcurses* nc){
   y = 0;
 
   // top line
-  cell_set_fg(&ul, 255, 255, 255);
+  x = 0;
+  cell_set_fg(&ul, 255 - rs * x, 255, 255);
   ncplane_putc(n, &ul);
   for(x = 1 ; x < maxx - 1 ; ++x){
     cell_set_fg(&uc, 255 - rs * x, 255 - gs * (x + y), 255);
     ncplane_putc(n, &uc);
   }
-  cell_set_fg(&ur, 1, 255 - gs * (x + y), 255);
+  cell_set_fg(&ur, 255 - rs * x, 255 - gs * (x + y), 255);
   ncplane_putc(n, &ur);
 
   // center
+  x = 0;
   for(y = 1 ; y < maxy - 1 ; ++y){
-    cell_set_fg(&cl, 255, 255 - gs * (x + y), 255 - bs * y);
+    cell_set_fg(&cl, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
     ncplane_putc(n, &cl);
     for(x = 1 ; x < maxx - 1 ; ++x){
       cell_set_fg(&cc, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
       ncplane_putc(n, &cc);
     }
-    cell_set_fg(&cr, 1, 255 - gs * (x + y), 255 - bs * y);
+    cell_set_fg(&cr, 255 - rs * x, 255 - gs * (x + y), 255 - bs * y);
     ncplane_putc(n, &cr);
   }
 
   // bottom line
-  cell_set_fg(&ll, 255, 255 - gs * (x + y), 1);
+  x = 0;
+  cell_set_fg(&ll, 255 - rs * x, 255 - gs * (x + y), 1);
   ncplane_putc(n, &ll);
   for(x = 1 ; x < maxx - 1 ; ++x){
     cell_set_fg(&lc, 255 - rs * x, 255 - gs * (x + y), 1);
     ncplane_putc(n, &lc);
   }
-  cell_set_fg(&lr, 1, 255 - gs * (x + y), 1);
+  cell_set_fg(&lr, 255 - rs * x, 255 - gs * (x + y), 1);
   ncplane_putc(n, &lr);
 
   // render!
   notcurses_render(nc);
   sleep(1);
-  return 0;
+  return gridinv_demo(nc, n, &ul, &uc, &ur, &cl, &cc, &cr, &ll, &lc, &lr);
 }