#include <CtrlLib/CtrlLib.h>

using namespace Upp;

struct Canvas: Ctrl {
	Point pos;
	
	Vector<Vector<Tuple<double, Pointf>>> drawing;

	PenInfo	pen;

	Canvas(){
		pos=Null;
		Zero(pen);
	}
	
	virtual bool Pen(Point p, const PenInfo& pn, dword keyflags) override {
		pen=pn;
		
		switch(pn.action){
			case PEN_DOWN:
				drawing.Add().Add(MakeTuple(pn.pressure, p));
				break;
			case 0: // Move
				if(!!pn.pressure && !drawing.IsEmpty()) drawing.Top().Add(MakeTuple(pn.pressure, p));
			case PEN_UP: // Finish
				Refresh();
				break;
		}
		return true;
	}

	virtual void Paint(Draw& w0) override {
		DrawPainter w(w0, GetSize());
		w.Co();
		w.Clear(SColorPaper());
		
		w.LineCap(LINECAP_ROUND);
		for(const auto& stroke : drawing)
			if(stroke.GetCount())
				for(int i = 0; i < stroke.GetCount() - 1; i++) {
					w.Move(stroke[i].b);
					w.Line(stroke[i + 1].b);
					w.Stroke(DPI(20) * stroke[i].a, Black());
				}
		
		int fcy = GetStdFontCy();
		int y = 10;
		auto Text = [&] (const String& text) {
			w.DrawText(10, y, text);
			y += fcy;
		};
		Text(AsString(pos));
		Text(String() << "Pressure: " << pen.pressure);
		Text(String() << "Rotation: " << pen.rotation);
		Text(String() << "Tilt: " << pen.tilt);
		Text(String() << "Barrel: " << pen.barrel);
		Text(String() << "Inverted: " << pen.inverted);
		Text(String() << "Eraser: " << pen.eraser);
	}
};

struct MyApp : TopWindow {
	Canvas c1;
	Canvas c2;
	Splitter s;
	
	MyApp(){
		Add(s.Horz(c1,c2));
	}
};

GUI_APP_MAIN { MyApp().Run(); }