basic setup with cairo

CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.18)
+project(chess C)
+file(GLOB SOURCES "src/*.c")
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK4 REQUIRED IMPORTED_TARGET gtk4)
+
+add_executable(${PROJECT_NAME} ${SOURCES})
+set_property(TARGET ${PROJECT_NAME} PROPERTY C_STANDARD 99)
+target_link_libraries(${PROJECT_NAME} PRIVATE PkgConfig::GTK4)

src/main.c

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+#include <gtk/gtk.h>
+#include <cairo.h>
+#include <stdbool.h>
+
+static void draw_event(GtkDrawingArea *area, cairo_t *cr, int width, int height, gpointer data) {
+	const double fieldSize = (double)(width < height ? width : height) / 8;
+	const double xOffset = (width - fieldSize * 8) / 2;
+	const double yOffset = (height - fieldSize * 8) / 2;
+	for(int x = 0; x < 8; ++x) {
+		for(int y = 0; y < 8; ++y) {
+			cairo_rectangle(cr, xOffset +  x * fieldSize, yOffset + y * fieldSize, fieldSize, fieldSize);
+			if((x + y) & 1) cairo_set_source_rgb(cr, 0.46274, 0.5882, 0.3373);
+			else cairo_set_source_rgb(cr, 0.9333, 0.9333, 0.8235);
+			cairo_fill(cr);
+		}
+	}
+}
+
+static void app_activate(GApplication *app, gpointer user_data) {
+	GtkWindow *win;
+	GtkWidget *drawArea;
+
+	win = GTK_WINDOW(gtk_window_new());
+	drawArea = gtk_drawing_area_new();
+	gtk_window_set_child(win, drawArea);
+	gtk_drawing_area_set_draw_func(GTK_DRAWING_AREA(drawArea), draw_event, NULL, NULL);
+	gtk_window_set_application(win, GTK_APPLICATION(app));
+	gtk_window_present(win);
+}
+
+int main(int argc, char **argv) {
+	GtkApplication *app;
+	int stat;
+
+	app = gtk_application_new("org.zinkel.chess", G_APPLICATION_DEFAULT_FLAGS);
+	g_signal_connect(app, "activate", G_CALLBACK (app_activate), NULL);
+	stat = g_application_run(G_APPLICATION(app), argc, argv);
+	g_object_unref (app);
+	return stat;
+}