dl_tool_ruler.h

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#pragma once
 
#ifndef DL_DISABLE_RENDER
#include "render/dl_factory.h"
#include "render/dl_graphics.h"
 
namespace dl::Tool
{
class Ruler
{
public:
    static Ruler* Create()
    {
        Ruler* ret = new Ruler;
        return ret;
    }
    
    void Update()
    {
        _bRender = false;
        if (g_input->KeyState(KeyCode::LEFT_CONTROL))
        {
            Point xy_mouse = g_input->GetCursorPosition();
            _coor->SetScale(g_ui->GetScale());
            _xy1 = toPoint(_coor->WorldToThis(toPosition(xy_mouse)));
            if (_xy0[0] < 0)
            {
                _xy0 = _xy1;
            }
            else
            {
                _bRender = true;
 
                _txt[0]->SetString(fmt::format("({})", to_string(_xy0)));
                _txt[1]->SetString(fmt::format("({})", to_string(_xy1)));
 
                Point xy_dt = _xy1 - _xy0;
                _txt[2]->SetString(fmt::format("dx: {} dy: {}", xy_dt[0], xy_dt[1]));
                _txt[3]->SetString(fmt::format("dis: {}", (unsigned)sqrt(Math::DistancePow2(xy_dt))));
 
                Position size0 = toPosition(_txt[0]->GetSize());
                Position size1 = toPosition(_txt[1]->GetSize());
                Position size3 = toPosition(_txt[3]->GetSize());
 
                Point xy_center = (_xy0 + _xy1) / 2;
                _txt[0]->SetPositionAlign(toPosition(_xy0), Align::RB);
                _txt[1]->SetPositionAlign(toPosition(_xy1), Align::LT);
                _txt[2]->SetPositionAlign(toPosition(xy_center), Align::LB);
                _txt[3]->SetPositionAlign(toPosition(xy_center), Align::RT);
            }
        }
        else
        {
            _xy0 = { -1, -1 };
        }   
    }
    
    void Render()
    {
        if (_bRender)
        {
            g_gfx->SetCoor(_coor);
            g_gfx->Line2D(toPosition(_xy0), toPosition(_xy1));
            for (auto& iter : _txt)
            {
                iter->Render();
            }
        }
    }
 
    ~Ruler()
    {
        delete _coor;
    }
private:
    Ruler() :
        _xy0{ -1, -1 },
        _bRender{ false }
    {
        _coor = Coor::Create();
        _coor->SetScale(g_ui->GetScale());
 
        for (auto& iter : _txt)
        {
            iter = g_factory->CreateText(0, 16, ColorDef::GREEN);
            iter->GetCoor()->SetParent(_coor);
            iter->SetBackground(true);
        }
    }
 
 
    Coor* _coor;
    std::array<gcText, 4> _txt;// 2为dx,dy 3为dis
    Point _xy0;
    Point _xy1;
    bool _bRender;
};
 
}
#endif