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Pen

 

Pen support (drawing with pen, reacting to pressure)

 

 

main.cpp

 

#include <CtrlLib/CtrlLib.h>

 

using namespace Upp;

 

struct MyApp : TopWindow {

    Point pos;

    

    Vector<Vector<Tuple<double, Pointf>>> drawing;

 

    PenInfo pen;

 

    virtual void Pen(Point p, const PenInfo& pn, dword keyflags) override {

        if(keyflags & K_SHIFT) {

            RectTracker tracker(*this);

            tracker.MinSize(Size(-100000,-100000));

            tracker.Track(Rect(p,p));

        }

        if(pn.pressure) {

            if((!!pn.pressure == !!pen.pressure) && drawing.GetCount())

                drawing.Top().Add(MakeTuple(pn.pressure, p));

            else

                drawing.Add().Add(MakeTuple(pn.pressure, p));

        }

        pen = pn;

        Refresh();

    }

 

    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);

    }

};

 

GUI_APP_MAIN

{

    MyApp().Run();

}

 

 

 

 

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