Basic multiline buffer concept

src/text_editor/main.cpp

@@ -1,17 +1,104 @@
 #define BASIC_IMPL
 #include "../pdf_browser/basic.h"
-
 #include "raylib.h"
+#include "raymath.h"
+
+#include "buffer.cpp"
+
+using Vec2 = Vector2;
+struct Rect2 {
+    Vec2 min;
+    Vec2 max;
+};
+
+Rectangle ToRectangle(Rect2 r) {
+    Rectangle result = {r.min.x, r.min.y, r.max.x - r.min.x, r.max.y - r.min.y};
+    return result;
+}
+
+// Render units - positions ready to draw, y
+// World units - positions offset by screen movement
+// Window units - positions inside the window (starts in left top of window)
+// World window units
+
+struct Window {
+    Rect2 rect_in_world_units;
+};
+
+Vec2 WorldToRenderUnits(Vec2 value, Vec2 camera_offset_world_to_render_units) {
+    Vec2 result = Vector2Subtract(value, camera_offset_world_to_render_units);
+    return result;
+}
+
+Vec2 WindowToWorldUnits(Vec2 value, const Window &window) {
+    Vector2 result = Vector2Add(value, window.rect_in_world_units.min);
+    return result;
+}
+
+Rect2 GetScreenRectRenderUnits() {
+    Rect2 result = {
+        {                      0,                        0},
+        {(float)GetRenderWidth(), (float)GetRenderHeight()}
+    };
+    return result;
+}
 
 int main() {
-    InitWindow(1280, 720, "Text editor");
-    SetWindowState(FLAG_WINDOW_RESIZABLE);
+    InitScratch();
+    RunBufferTests();
+
+    return 0;
+    InitWindow(800, 600, "Hello");
     SetTargetFPS(60);
 
+    float font_size    = 14;
+    float font_spacing = 1;
+    Font  font         = LoadFontEx("C:/Windows/Fonts/consola.ttf", (int)font_size, NULL, 250);
+
+    Array<char>   buffer  = {};
+    Array<Window> windows = {};
+    windows.add({GetScreenRectRenderUnits()});
+
+    Vec2 camera_offset_world_to_render_units = {};
     while (!WindowShouldClose()) {
+        if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) || IsKeyDown(KEY_SPACE)) {
+            camera_offset_world_to_render_units = Vector2Subtract(camera_offset_world_to_render_units, GetMouseDelta());
+        }
+
+        for (int c = GetCharPressed(); c; c = GetCharPressed()) {
+            Assert(c >= ' ' && c <= '~');
+            buffer.add((char)c);
+        }
+
         BeginDrawing();
         ClearBackground(RAYWHITE);
+
+        For(windows) {
+            Rect2 rect_in_render_units = {
+                WorldToRenderUnits(it.rect_in_world_units.min, camera_offset_world_to_render_units),
+                WorldToRenderUnits(it.rect_in_world_units.max, camera_offset_world_to_render_units),
+            };
+            Rectangle rectangle_in_render_units = ToRectangle(rect_in_render_units);
+            DrawRectangleRec(rectangle_in_render_units, WHITE);
+
+            {
+                Vec2 text_position_in_window_units = {};
+                Vec2 text_position_in_world_units  = WindowToWorldUnits(text_position_in_window_units, it);
+                Vec2 text_position_in_render_units = WorldToRenderUnits(text_position_in_world_units, camera_offset_world_to_render_units);
+                DrawTextEx(font, "window 1", text_position_in_render_units, font_size, font_spacing, BLACK);
+            }
+
+            {
+                Vec2 text_position_in_window_units = {0, font_size};
+                Vec2 text_position_in_world_units  = WindowToWorldUnits(text_position_in_window_units, it);
+                Vec2 text_position_in_render_units = WorldToRenderUnits(text_position_in_world_units, camera_offset_world_to_render_units);
+
+                buffer.add('\0');
+                DrawTextEx(font, buffer.data, text_position_in_render_units, font_size, font_spacing, BLACK);
+                buffer.pop();
+            }
+        }
+
         EndDrawing();
     }
-    CloseWindow();
 }