1 files changed, 103 insertions, 0 deletions
diff --git a/plot.c b/plot.c
new file mode 100644
index 0000000..6a579d6
--- /dev/null
+++ b/plot.c
@@ -0,0 +1,103 @@
+#include <SDL.h>
+
+#include "colour.h"
+#include "plot.h"
+
+static SDL_Window *window = NULL;
+static SDL_Renderer *renderer = NULL;
+
+void plot_update()
+{
+	SDL_RenderPresent(renderer);
+}
+
+void plot_rect(unsigned int x, unsigned int y, unsigned int width, unsigned int height, struct colour *c)
+{
+	SDL_Rect rect;
+
+	SDL_SetRenderDrawColor(renderer, c->r, c->g, c->b, 255);
+
+	rect.x = x;
+	rect.y = y;
+	rect.w = width;
+	rect.h = height;
+
+	SDL_RenderFillRect(renderer, &rect);
+}
+
+void plot_cell(unsigned int x, unsigned int y, struct colour *c)
+{
+	plot_rect(
+		x*CELL_SIZE+(x-1)*BORDER_THICKNESS,
+		y*CELL_SIZE+(y-1)*BORDER_THICKNESS,
+		CELL_SIZE,
+		CELL_SIZE,
+		c
+	);
+}
+
+void plot_cell_borders()
+{
+	int i, j;
+
+	struct colour col = {.r = 0, .g = 0, .b = 0};
+
+	for (i = 1; i < WIDTH_CELLS; i++)
+	{
+		j = i*CELL_SIZE + (i-1)*BORDER_THICKNESS;
+		plot_rect(
+			j, 0,
+			BORDER_THICKNESS, HEIGHT_PIXELS,
+			&col);
+	}
+
+	for (i = 1; i < HEIGHT_CELLS; i++)
+	{
+		j = i*CELL_SIZE + (i-1)*BORDER_THICKNESS;
+		plot_rect(
+			0, j,
+			WIDTH_PIXELS, BORDER_THICKNESS,
+			&col);
+	}
+
+}
+
+
+int plot_init()
+{
+	if (SDL_Init(SDL_INIT_VIDEO) < 0)
+	{
+		fprintf(stderr, "Failed to init SDL video: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	window = SDL_CreateWindow(
+		"Some title",
+		SDL_WINDOWPOS_UNDEFINED,
+		SDL_WINDOWPOS_UNDEFINED,
+		WIDTH_PIXELS,
+		HEIGHT_PIXELS,
+		SDL_WINDOW_SHOWN
+	);
+
+	if (window == NULL)
+	{
+		fprintf(stderr, "Failed to create window: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	renderer = SDL_CreateRenderer(window, 0, 0);
+	if (renderer == NULL)
+	{
+		fprintf(stderr, "Failed to get window renderer: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	/* blank out the background with gray */
+	SDL_SetRenderDrawColor(renderer, 0x33, 0x33, 0x33, 0xFF);
+	SDL_RenderFillRect(renderer, NULL);
+
+	plot_cell_borders();
+
+	return 0;
+}