Added WidgetRect to draw rectangles

Makefile

@@ -3,6 +3,7 @@ src_files += sdl_helpers.cpp
 
 src_files += Widgets/Widget.cpp
 src_files += Widgets/WidgetText.cpp
+src_files += Widgets/WidgetRect.cpp
 
 all:
 	g++ $(src_files) -Wall -lSDL2 -lSDL2_ttf -lSDL2_image -o trmnl_sdl

Widgets/WidgetRect.cpp

@@ -0,0 +1,204 @@
+#include "WidgetRect.h"
+
+#include <vector>
+
+#include "../sdl_helpers.h"
+
+using std::vector;
+
+WidgetRect::WidgetRect(int x, int y, int width, int height,
+	int radius, int stroke_size, SDL_Color color)
+: Widget(x, y, width, height),
+m_color(color),
+m_stroke_size(stroke_size),
+m_radius(radius)
+{
+}
+
+WidgetRect::WidgetRect(int x, int y, int width, int height,
+		int radius, int stroke_size)
+: Widget(x, y, width, height),
+m_color{.r = 0, .g = 0, .b = 0, .a = SDL_ALPHA_OPAQUE},
+m_stroke_size(stroke_size),
+m_radius(radius)
+{
+}
+
+void WidgetRect::draw()
+{
+	// Clear surface
+	SDL_FillRect(m_surface, nullptr, SDL_MapRGBA(m_surface->format, 255, 255, 255, SDL_ALPHA_TRANSPARENT));
+
+	if (m_radius > 0)
+	{
+		// Draw rounded corners here
+		draw_circle_corner(m_rect.w - m_radius, m_radius - 1, 1);
+		draw_circle_corner(m_radius - 1, m_radius - 1, 2);
+		draw_circle_corner(m_radius - 1, m_rect.h - m_radius, 3);
+		draw_circle_corner(m_rect.w - m_radius, m_rect.h - m_radius, 4);
+
+		// Draw X rect
+		if (m_radius * 2 < m_rect.w)
+		{
+			SDL_Rect rect;
+			rect.x = 0;
+			rect.y = m_radius;
+			rect.w = m_rect.w;
+			rect.h = m_rect.h - 2 * m_radius;
+			SDL_FillRect(m_surface, &rect, SDL_MapRGBA(m_surface->format, m_color.r, m_color.g, m_color.b, m_color.a));
+
+			if (m_stroke_size > 0)
+			{
+				rect.x = m_stroke_size;
+				rect.y = m_radius;
+				rect.w = m_rect.w - 2 * m_stroke_size;
+				rect.h = m_rect.h - 2 * m_radius;
+				SDL_FillRect(m_surface, &rect, SDL_MapRGBA(m_surface->format, 255, 255, 255, SDL_ALPHA_TRANSPARENT));
+			}
+		}
+
+		// Draw Y rect
+		if (m_radius * 2 < m_rect.h)
+		{
+			SDL_Rect rect;
+			rect.x = m_radius;
+			rect.y = 0;
+			rect.w = m_rect.w - 2 * m_radius;
+			rect.h = m_rect.h;
+			SDL_FillRect(m_surface, &rect, SDL_MapRGBA(m_surface->format, m_color.r, m_color.g, m_color.b, m_color.a));
+
+			if (m_stroke_size > 0)
+			{
+				rect.x = m_radius;
+				rect.y = m_stroke_size;
+				rect.w = m_rect.w - 2 * m_radius;
+				rect.h = m_rect.h - 2 * m_stroke_size;
+				SDL_FillRect(m_surface, &rect, SDL_MapRGBA(m_surface->format, 255, 255, 255, SDL_ALPHA_TRANSPARENT));
+			}
+		}
+	}
+	else
+	{
+		SDL_Rect rect;
+		rect.x = 0;
+		rect.y = 0;
+		rect.w = m_rect.w;
+		rect.h = m_rect.h;
+		SDL_FillRect(m_surface, &rect, SDL_MapRGBA(m_surface->format, m_color.r, m_color.g, m_color.b, m_color.a));
+
+		if (m_stroke_size > 0)
+		{
+			rect.x = m_stroke_size;
+			rect.y = m_stroke_size;
+			rect.w = m_rect.w - 2 * m_stroke_size;
+			rect.h = m_rect.h - 2 * m_stroke_size;
+			SDL_FillRect(m_surface, &rect, SDL_MapRGBA(m_surface->format, 255, 255, 255, SDL_ALPHA_TRANSPARENT));
+		}
+	}
+}
+
+Widget* WidgetRect::builder(const nlohmann::json& j)
+{
+	int x = 0;
+	int y = 0;
+	int width = 0;
+	int height = 0;
+	int radius = 0;
+	int stroke_size = -1;
+	SDL_Color color = {.r = 0, .g = 0, .b = 0, .a = SDL_ALPHA_OPAQUE};
+
+	json_extract(j, "x", x);
+	json_extract(j, "y", y);
+	json_extract(j, "width", width);
+	json_extract(j, "height", height);
+	json_extract(j, "radius", radius);
+	json_extract(j, "stroke", stroke_size);
+	json_extract(j, "color", color);
+
+	return new WidgetRect(x, y, width, height, radius, stroke_size, color);
+}
+
+void WidgetRect::draw_circle_corner(int x, int y, int quadrant)
+{
+	if (0 == m_radius)
+	{
+		return;
+	}
+
+	int x_add;
+	int y_add;
+
+	switch (quadrant)
+	{
+	case 1:
+		x_add = 1;
+		y_add = -1;
+		break;
+
+	case 2:
+		x_add = -1;
+		y_add = -1;
+		break;
+
+	case 3:
+		x_add = -1;
+		y_add = 1;
+		break;
+
+	case 4:
+		x_add = 1;
+		y_add = 1;
+		break;
+
+	default:
+		// TODO: Message printing
+		return;
+		break;
+	}
+
+	// Create renderer
+	SDL_Renderer* renderer = SDL_CreateSoftwareRenderer(m_surface);
+	if (nullptr == renderer)
+	{
+		// TODO: Message printing
+		return;
+	}
+	SDL_SetRenderDrawColor(renderer, m_color.r, m_color.g, m_color.b, m_color.a);
+
+	vector<SDL_Point> points;
+
+	int max_dist = m_radius * m_radius;
+	int min_dist = 0;
+	if (m_stroke_size > 0)
+	{
+		min_dist = (m_radius - m_stroke_size) * (m_radius - m_stroke_size);
+	}
+
+	for (int i_x = 0; i_x < m_radius; ++i_x)
+	for (int i_y = 0; i_y < m_radius; ++i_y)
+	{
+		bool should_fill = false;
+
+		// a2 + b2 = c2
+		int dist = i_x * i_x + i_y * i_y;
+
+		// <= c2 (max) && > c2 (min)
+		if ((dist <= max_dist) && (dist >= min_dist))
+		{
+			should_fill = true;
+		}
+
+		if (should_fill)
+		{
+			SDL_Point point =
+			{
+				.x = x + x_add * i_x,
+				.y = y + y_add * i_y
+			};
+
+			points.push_back(point);
+		}
+	}
+	SDL_RenderDrawPoints(renderer, points.data(), points.size());
+	SDL_DestroyRenderer(renderer);
+}

Widgets/WidgetRect.h

@@ -0,0 +1,39 @@
+#ifndef WIDGET_RECT_H_
+#define WIDGET_RECT_H_
+
+#include "Widget.h"
+
+class WidgetRect : public Widget
+{
+protected:
+	// The color of the rectangle
+	// Default - Black (0, 0, 0)
+	SDL_Color m_color;
+
+	// Size of the internal stroke
+	// Set to -1 to fill the space
+	// Default - -1
+	int m_stroke_size;
+
+	// Corner rounding radius
+	// Default - 0;
+	int m_radius;
+
+public:
+	WidgetRect(int x, int y, int width, int height,
+		int radius, int stroke_size, SDL_Color color);
+
+	WidgetRect(int x, int y, int width, int height,
+		int radius = 0, int stroke_size = -1);
+
+	virtual void draw() override;
+
+	static Widget* builder(const nlohmann::json& j);
+
+private:
+	// x, y - center of circle
+	// quadrant - 1--4
+	void draw_circle_corner(int x, int y, int quadrant);
+};
+
+#endif // WIDGET_RECT_H_

main.cpp

@@ -12,6 +12,7 @@
 #include "sdl_helpers.h"
 #include "Widgets/Widget.h"
 #include "Widgets/WidgetText.h"
+#include "Widgets/WidgetRect.h"
 
 using std::cout;
 using std::endl;
@@ -23,6 +24,7 @@ using nlohmann::json;
 void init_builders(map<string, Widget*(*)(const json&)>& widget_builders)
 {
 	widget_builders["text"] = &WidgetText::builder;
+	widget_builders["rect"] = &WidgetRect::builder;
 }
 
 int main(int argc, char **argv)