Gauge.h

#pragma once 
/*
  AWind.h - Arduino window library support for Color TFT LCD Boards
  Copyright (C)2015 Andrei Degtiarev. All right reserved
  

  You can always find the latest version of the library at 
  https://github.com/AndreiDegtiarev/AWind


  This library is free software; you can redistribute it and/or
  modify it under the terms of the CC BY-NC-SA 3.0 license.
  Please see the included documents for further information.

  Commercial use of this library requires you to buy a license that
  will allow commercial use. This includes using the library,
  modified or not, as a tool to sell products.

  The license applies to all part of the library including the 
  examples and tools supplied with the library.
*/
#include "Window.h"
class Gauge : public Window
{
public:
    Color _fillColor;  
    float _value;     
    float _oldValue;  
    float _minValue;  
    float _maxValue;  
    bool  _drawOnlyPointer; 

    static const float _sector_angle_rad;


    Gauge(int left,int top,int width,int height)
        :Window(F("gauge"),left,top,width,height),
        _value(0),
        _oldValue(0),
        _minValue(0),
        _maxValue(100),
        _fillColor(Color::Black),
        _drawOnlyPointer(false)
    {
        SetDecorators(Environment::Get()->FindDecorators(F("Gauge")));
    }
    void SetFillColor(Color fillColor)
    {
        _fillColor=fillColor;
    }

    void SetMinMax(float minVal,float maxVal)
    {
        _minValue=minVal;
        _maxValue=maxVal;
    }

    float SetValue(float value)
    {
        _value=max(_minValue,value);
        _value=min(_maxValue,_value);
        //out<<F("Gauge value: ")<<_value<<endln;
        _drawOnlyPointer=true;
        if (this->IsVisible())
        {
            DC dc;
            PrepareDC(&dc);
            OnDraw(&dc);
        }
        _oldValue=_value;
        _drawOnlyPointer=false;
    }
};
const float Gauge::_sector_angle_rad = 3.14 / 2 * 0.8;