From 910c8c55521abc3b8ed415b9d5678e85abb3a408 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 05 Aug 2021 01:56:17 -0400
Subject: tk: Add circle check

---
(limited to 'src/tk/check.c')

diff --git a/src/tk/check.c b/src/tk/check.c
index e84d30a..c8e639c 100644
--- a/src/tk/check.c
+++ b/src/tk/check.c
@@ -18,6 +18,7 @@
  */
 
 #include <SDL.h>
+#include <math.h>
 #include "../tk.h"
 #include "widget.h"
 
@@ -97,6 +98,52 @@ _mftk_check_render_box(SDL_Rect *rect, SDL_Color *color, SDL_Renderer *renderer)
 }
 
 static int
+_mftk_check_render_cir(SDL_Rect *rect, SDL_Color *color, SDL_Renderer *renderer)
+{
+	int e = 0;
+	int r;
+	int x;
+	int y;
+	int i;
+
+	if (SDL_SetRenderDrawColor(renderer,
+				color->r, color->g, color->b, color->a) < 0) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't render widget: %s",
+				SDL_GetError());
+		e = -1;
+	}
+
+#define _mftk_check_px(X, Y) \
+	do { \
+		if (SDL_RenderDrawPoint(renderer, \
+					rect->x + r + X, rect->y + r + Y) < 0){\
+			SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, \
+					"Couldn't render widget: %s", \
+					SDL_GetError()); \
+			e = -1; \
+		} \
+	} while (0)
+
+	r = rect->w / 2;
+	for (x = 0, y = r; y > x; ++x) {
+		y = round(sqrt((r-0.5)*(r-0.5) - (x-0.5)*(x-0.5)) + 0.5);
+		for (i = 0; i <=   y; ++i) _mftk_check_px(  x,   i);
+		for (i = 0; i >= 0-y; --i) _mftk_check_px(  x,   i);
+		for (i = 0; i <=   y; ++i) _mftk_check_px(0-x,   i);
+		for (i = 0; i >= 0-y; --i) _mftk_check_px(0-x,   i);
+		for (i = 0; i <=   y; ++i) _mftk_check_px(  i,   x);
+		for (i = 0; i <=   y; ++i) _mftk_check_px(  i, 0-x);
+		for (i = 0; i >= 0-y; --i) _mftk_check_px(  i,   x);
+		for (i = 0; i >= 0-y; --i) _mftk_check_px(  i, 0-x);
+	}
+
+#undef _mftk_check_px
+
+	return e;
+}
+
+static int
 _mftk_check_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
 {
 	struct mftk_check *c = (struct mftk_check *) w;
@@ -111,6 +158,10 @@ _mftk_check_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
 		if (_mftk_check_render_box(&rect, c->butn_color, renderer) < 0){
 			e = -1;
 		}
+	} else {
+		if (_mftk_check_render_cir(&rect, c->butn_color, renderer) < 0){
+			e = -1;
+		}
 	}
 
 	if (c->state == SDL_TRUE) {
@@ -123,6 +174,11 @@ _mftk_check_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
 						renderer) < 0) {
 				e = -1;
 			}
+		} else {
+			if (_mftk_check_render_cir(&rect, c->mark_color,
+						renderer) < 0) {
+				e = -1;
+			}
 		}
 	}
 
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