Finally do some drawing.

src/gui/main.cc

@@ -1,9 +1,24 @@
 #include "globals.h"
 #include "ui.h"
+#include "uipp.h"
+#include "fmt/format.h"
 
 static uiWindow* mainwin;
 static uiArea* area;
 
+static uiDrawStrokeParams STROKE = {
+	uiDrawLineCapFlat,
+	uiDrawLineJoinMiter,
+	0.5,
+	1.0,
+	nullptr,
+	0,
+	0.0
+};
+
+static uiDrawBrush WHITE = { uiDrawBrushTypeSolid, 1.0, 0.0, 1.0, 1.0 };
+static uiDrawBrush BLACK = { uiDrawBrushTypeSolid, 0.0, 0.0, 0.0, 1.0 };
+
 static int close_cb(uiWindow* window, void* data)
 {
 	uiQuit();
@@ -17,6 +32,8 @@ static int quit_cb(void* data)
 
 static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
 {
+	UIPath(p).rectangle(0, 0, p->AreaWidth, p->AreaHeight).fill(WHITE);
+	UIPath(p).begin(0, 0).lineTo(p->AreaWidth, p->AreaHeight).end().stroke(BLACK, STROKE);
 }
 
 static void handlerMouseEvent(uiAreaHandler *a, uiArea *area, uiAreaMouseEvent *

src/gui/uipp.h

@@ -0,0 +1,78 @@
+#ifndef UIPP_H
+#define UIPP_H
+
+class UIPath
+{
+	class Figure
+	{
+	public:
+		Figure(UIPath& path, double x, double y):
+			_path(path)
+		{
+			uiDrawPathNewFigure(path._path, x, y);
+		}
+
+		Figure& lineTo(double x, double y)
+		{
+			uiDrawPathLineTo(_path._path, x, y);
+			return *this;
+		}
+
+		UIPath& end()
+		{
+			uiDrawPathCloseFigure(_path._path);
+			return _path;
+		}
+
+	private:
+		UIPath& _path;
+	};
+
+public:
+	UIPath(uiAreaDrawParams* params):
+		_params(params),
+		_path(uiDrawNewPath(uiDrawFillModeWinding))
+	{}
+
+	UIPath& rectangle(double x, double y, double w, double h)
+	{
+		uiDrawPathAddRectangle(_path, x, y, w, h);
+		return *this;
+	}
+
+	Figure begin(double x, double y)
+	{
+		return Figure(*this, x, y);
+	}
+
+	void fill(uiDrawBrush& fillBrush)
+	{
+		uiDrawPathEnd(_path);
+		uiDrawFill(_params->Context, _path, &fillBrush);
+	}
+
+	void stroke(uiDrawBrush& strokeBrush, uiDrawStrokeParams& strokeParams)
+	{
+		uiDrawPathEnd(_path);
+		uiDrawStroke(_params->Context, _path, &strokeBrush, &strokeParams);
+	}
+
+	void fill(uiDrawBrush& strokeBrush, uiDrawStrokeParams& strokeParams, uiDrawBrush& fillBrush)
+	{
+		uiDrawPathEnd(_path);
+		uiDrawFill(_params->Context, _path, &fillBrush);
+		uiDrawStroke(_params->Context, _path, &strokeBrush, &strokeParams);
+	}
+
+	~UIPath()
+	{
+		uiDrawFreePath(_path);
+	}
+	
+private:
+	uiAreaDrawParams* _params;
+	uiDrawPath* _path;
+};
+
+#endif
+