Fixed the overflows and make the render handle SFML's weird window coordinates not matching world coordinates.

render.cpp

@@ -92,7 +92,6 @@ void SFMLRender::render_grid(const std::wstring &text, sf::Color default_fg, sf:
   sf::Color cur_fg = default_fg;
   sf::Color cur_bg = default_bg;
 
-  // make a copy so we don't modify the cached one
   $ansi.parse(text, [&](auto fg, auto bg) {
       cur_fg = fg;
       cur_bg = bg;
@@ -235,9 +234,14 @@ void SFMLRender::draw(Panel &panel, float x_offset, float y_offset) {
 }
 
 bool SFMLRender::mouse_position(Panel &panel, Point &out) {
-  sf::Vector2i pos = sf::Mouse::getPosition($window);
+  // yes, you have to do this in sfml
+  sf::Vector2f pos = $window.mapPixelToCoords(sf::Mouse::getPosition($window));
+
   auto bounds = panel.grid ? $grid_bounds : $text_bounds;
 
+  println("mouse position pos={},{} panel.pos={},{} panel.size={},{}",
+      pos.x, pos.y, panel.x, panel.y, panel.width, panel.height);
+
   if(pos.x >= panel.x && pos.y >= panel.y
       && pos.x <= (panel.x + panel.width * bounds.width)
       && pos.y <= (panel.y + panel.height * bounds.height))

status.txt

@@ -1,9 +1,6 @@
 TODAY'S GOAL:
 
-====
+0. \ua3fd causes the character immediately after to vanish.
-Font Extractor
-===
-
 1. Why do Sliders only have to be kept around forever and can't go in containers like everything else?
 2. Why are sliders not selected when I click on them? Is it a hover?
 3. Why do fonts render blank? Also when I scroll they slowly disappear until there's a column.

tools/designer.cpp

@@ -65,6 +65,7 @@ struct FontGrid {
   }
 
   void render(size_t start_char, bool fill) {
+    dbc::check(start_char > 0 && start_char < $charmap.size(), format("attempt render from bad start {}", start_char));
     size_t next_char = start_char;
 
     for(size_t y = 0; y < height; ++y) {
@@ -73,6 +74,9 @@ struct FontGrid {
           next_char++;
         }
 
+        // just get out of here, nothing more to render
+        if(next_char >= $charmap.size()) return;
+
         $grid[y][x] = {
           .cm_index = next_char,
           .as_string = $charmap[next_char],
@@ -122,8 +126,8 @@ class GUI {
   Canvas $canvas;
   SFMLRender $renderer;
   FontGrid $font_grid;
-  size_t $start_char = 0;
+  size_t $start_char = 1;
-  size_t $fill_char = 0;
+  size_t $fill_char = 1;
   WhatTheColor $fg_color;
   WhatTheColor $bg_color;
   Component $fg_settings;
@@ -157,8 +161,8 @@ class GUI {
     for(size_t y = 0; y < $font_grid.height; y++) {
       for(size_t x = 0; x < $font_grid.width; x++, flip_it++) {
         $canvas.DrawText(x * 2, y * 4, $font_grid.as_string(x, y), [&](auto &pixel) {
-          pixel.foreground_color = Color::HSV($fg_color.h, $fg_color.s, $fg_color.v);
+          pixel.foreground_color = Color::HSV($fg_color.h, $fg_color.s, $fg_color.v / (flip_it % 2 + 1));
-          pixel.background_color = Color::HSV($bg_color.h, $bg_color.s, $bg_color.v / (flip_it % 2 * 2 + 1));
+          pixel.background_color = Color::HSV($bg_color.h, $bg_color.s, $bg_color.v / (flip_it % 2 + 1));
         });
       }
     }
@@ -235,6 +239,7 @@ class GUI {
     using KB = sf::Keyboard;
     sf::Event event;
     int font_size = $renderer.font_size();
+    int page_size = $font_grid.page_size();
 
     while($renderer.poll_event(event)) {
       if(event.type == sf::Event::Closed) {
@@ -242,12 +247,12 @@ class GUI {
         return true;
       } else if(event.type ==  sf::Event::KeyPressed) {
         if(KB::isKeyPressed(KB::Up)) {
-          $start_char = std::max(size_t(1), $start_char - $font_grid.page_size());
+          $start_char = std::max(1, int($start_char) - page_size);
           render_grid($start_char, false);
           event_happened = true;
           $renderer.clear_cache();
         } else if(KB::isKeyPressed(KB::Down)) {
-          $start_char = std::min($font_grid.max_chars(), $start_char + $font_grid.page_size());
+          $start_char = std::min($font_grid.max_chars() - page_size, $start_char + page_size);
           render_grid($start_char, false);
           $renderer.clear_cache();
         } else if(KB::isKeyPressed(KB::Equal)) {