Make the display responsive

1 files changed, 96 insertions, 16 deletions

diff --git a/src/ray.c b/src/ray.c
index f96c626..a655f8c 100644
--- a/src/ray.c
+++ b/src/ray.c
@@ -26,6 +26,10 @@
 #define DEFAULT_HEIGHT 200
 #define DEFAULT_WIDTH 16*DEFAULT_HEIGHT/9
 
+static int current_input = 0;
+static int current_x;
+static int current_y;
+
 void
 init(void)
 {
@@ -63,20 +67,60 @@ min(int x, int y)
 		return y;
 }
 
+static void
+draw_calc(void)
+{
+	char txt[64] = {0};
+	int win_width, win_height;
+	int txt_width;
+	int font_size;
+
+	sprintf(txt, "%d + %d", current_x, current_y);
+
+	win_width = GetScreenWidth();
+	win_height = GetScreenHeight();
+
+	font_size = min(win_height/3, 40);
+	txt_width = MeasureText(txt, font_size);
+
+	if (txt_width > win_width)
+	{
+		float scale = txt_width/win_width;
+		font_size = font_size/scale;
+		txt_width = MeasureText(txt, font_size);
+	}
+
+	DrawText(txt, (win_width-txt_width)/2, win_height/6, font_size, GRAY);
+
+	TraceLog(LOG_INFO, "calulation %d + %d successfully drawn",
+		 current_x, current_y);
+}
+
 void
 display_calc(int x, int y)
 {
-	char txt[32] = {0};
+	current_x = x;
+	current_y = y;
+	BeginDrawing();
+	ClearBackground(RAYWHITE);
+	draw_calc();
+	EndDrawing();
+}
+
+static void
+draw_input(void)
+{
+	char txt[64] = {0};
 	int win_width, win_height;
 	int txt_width;
 	int font_size;
 
-	sprintf(txt, "%d + %d", x, y);
+	sprintf(txt, "%d", current_input);
 
 	win_width = GetScreenWidth();
 	win_height = GetScreenHeight();
 
-	font_size = min(win_height/3, 40);
+	font_size = min(win_height/4, 30);
 	txt_width = MeasureText(txt, font_size);
 
 	if (txt_width > win_width)
@@ -86,38 +130,74 @@ display_calc(int x, int y)
 		txt_width = MeasureText(txt, font_size);
 	}
 
+	DrawText(txt, (win_width-txt_width)/2, win_height*4/6, font_size, DARKGRAY);
+
+	TraceLog(LOG_INFO, "input successfully drawn");
+}
+
+static void
+redraw(void)
+{
 	BeginDrawing();
 	ClearBackground(RAYWHITE);
-	DrawText(txt, (win_width-txt_width)/2, win_height/6, font_size, GRAY);
+	draw_calc();
+	draw_input();
 	EndDrawing();
+}
+
+static void
+add_input_digit(int digit)
+{
+	current_input *= 10;
+	current_input += digit;
+	redraw();
+}
+
+static void
+check_digit(int digit)
+{
+	if (IsKeyPressed(KEY_ZERO + digit))
+	{
+		add_input_digit(digit);
+		TraceLog(LOG_INFO, "digit %d added to input", digit);
+		TraceLog(LOG_INFO, "input is now %d", current_input);
+	}
+}
 
-	TraceLog(LOG_INFO, "calulation %d + %d successfully drawn", x, y);
+static void
+check_digits(void)
+{
+	for (int i = 0; i < 10; i++)
+		check_digit(i);
 }
 
 int
 read_input(void)
 {
 	TraceLog(LOG_INFO, "waiting for user input");
+	current_input = 0;
+
 	while (!WindowShouldClose())
 	{
-		/* BeginDrawing(); */
 		PollInputEvents();
+
+		if (IsWindowResized())
+			redraw();
 		if (IsKeyPressed(KEY_ENTER))
-		{
-			TraceLog(LOG_INFO, "enter key pressed");
+			return current_input;
+		if (IsKeyPressed(KEY_Q) || IsKeyPressed(KEY_A))
 			return DISP_QUIT;
-		}
-		if (IsKeyPressed(KEY_Q))
-		{
-			return DISP_QUIT;
-		}
 		if (IsKeyPressed(KEY_R) || IsKeyPressed(KEY_G))
-		{
 			return DISP_RELOAD;
+		if (IsKeyPressed(KEY_BACKSPACE))
+		{
+			current_input = current_input / 10;
+			redraw();
 		}
-		/* EndDrawing(); */
+		check_digits();
 	}
-	return INT_MAX;
+
+	return DISP_QUIT;
 }
 
 void