From 7686e759186519d6230c7f32c815bad16223c547 Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Sat, 10 Aug 2024 19:31:37 +0200
Subject: Text area

---
 examples/ui.c | 59 ++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 38 insertions(+), 21 deletions(-)

diff --git a/examples/ui.c b/examples/ui.c
index afb9dbf..95a3235 100755
--- a/examples/ui.c
+++ b/examples/ui.c
@@ -264,13 +264,19 @@ i64 enum_text_columns(i64 num_chars, c8 *text) {
 
   for (i64 i = 0; i < num_chars; ++i) {
     if (text[i] <= ' ') {
-      if (text[i] == '\n')
+      if (text[i] == '\n') {
+        if (cols < n)
+          cols = n;
         n = 0;
-      else if (text[i] == '\b' && i > 0)
+      } else if (text[i] == '\b' && i > 0) {
+        if (cols < n)
+          cols = n;
         n -= char_width(text[i - 1]) + char_spacing(num_chars, text, i - 1);
-      else if (text[i] == '\r')
+      } else if (text[i] == '\r') {
+        if (cols < n)
+          cols = n;
         n = 0;
-      else
+      } else
         n += char_width(' ') + char_spacing(num_chars, text, i);
       continue;
     }
@@ -288,30 +294,30 @@ i64 enum_text_rows(i64 num_chars, c8 *text) {
 
   i64 rows = 0;
 
-  for (i64 i = 0; i < num_chars; ++i)
-    if (text[i] == '\n')
-      ++rows;
-
-  if (num_chars > 0 && text[num_chars - 1] != '\n')
-    ++rows;
+  for (i64 i = 0; i <= num_chars; ++i)
+    if (i == num_chars || text[i] == '\n') {
+      if (rows > 0)
+        ++rows;
+      rows += CHAR_NUM_BITS_Y;
+    }
 
   return rows;
 }
 
-void print_text(u32 color, i64 x0, i64 y0, f64 scale_x, f64 scale_y, i64 num_chars, c8 *text) {
+void print_text(u32 color, f64 x0, f64 y0, f64 scale_x, f64 scale_y, i64 num_chars, c8 *text) {
   assert(text != NULL);
 
   f64 x = x0;
   f64 y = y0;
 
-  f64 kx =  scale_x / (CHAR_NUM_BITS_X + 1);
-  f64 h  = (scale_y * CHAR_NUM_BITS_Y) / (CHAR_NUM_BITS_Y + 1);
+  f64 kx = scale_x;
+  f64 h  = scale_y * CHAR_NUM_BITS_Y;
 
   for (i64 n = 0; n < num_chars; ++n) {
     if (text[n] <= ' ') {
       if (text[n] == '\n') {
         x  = x0;
-        y += scale_y;
+        y += scale_y * (CHAR_NUM_BITS_Y + 1);
       }
       else if (text[n] == '\b' && n > 0)
         x -= kx * (char_width(text[n - 1]) + char_spacing(num_chars, text, n - 1));
@@ -350,6 +356,16 @@ void print_text(u32 color, i64 x0, i64 y0, f64 scale_x, f64 scale_y, i64 num_cha
   }
 }
 
+void draw_text_area(u32 color, f64 x0, f64 y0, f64 width, f64 height, i64 num_chars, c8 *text) {
+  i64 num_columns = enum_text_columns(num_chars, text);
+  i64 num_rows    = enum_text_rows(num_chars, text);
+
+  f64 scale_x = width  / num_columns;
+  f64 scale_y = height / num_rows;
+
+  print_text(color, x0, y0, scale_x, scale_y, num_chars, text);
+}
+
 i32 main(i32 argc, c8 **argv) {
   (void) argc;
   (void) argv;
@@ -369,17 +385,18 @@ i32 main(i32 argc, c8 **argv) {
       for (i32 i = 0; i < platform.frame_width; ++i)
         platform.pixels[j * platform.frame_width + i] = 0x302000;
 
+    i64 w  = platform.frame_width  / 2;
+    i64 h  = platform.frame_height / 2;
+    i64 x0 = w / 2;
+    i64 y0 = h / 2;
+
     i64 color = 0xff7f7f;
 
-    if (platform.cursor_x >= 80 && platform.cursor_x < 80 + (enum_text_columns(14, "Hello, Sailor!") * 80) / (CHAR_NUM_BITS_X + 1) &&
-        platform.cursor_y >= 80 && platform.cursor_y < 180)
+    if (platform.cursor_x >= x0 && platform.cursor_x < x0 + w &&
+        platform.cursor_y >= y0 && platform.cursor_y < y0 + h)
       color = 0xffffff;
 
-    print_text(color, 80, 80, 80., 80., 14, "Hello, Sailor!");
-
-    c8 chars[] = "\"#$%&'()*+,-./\n0123456789:;<=>?@\nABCDEFGHIJKLMNOPQRSTUVWXYZ\n[\\]^_`\nabcdefghijklmnopqrstuvwxyz\n{|}~";
-
-    print_text(0x7fffff, 80, 200, 80., 80., sizeof chars - 1, chars);
+    draw_text_area(color, x0, y0, w, h, 27, "Hello, Sailor!\nUI edit text");
 
     p_render_frame();
   }
-- 
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