File content as of revision 0:a2686ef737c2:

//-----------------------------------------------------------
//  SeekBar class
//
//  2016/03/29, Copyright (c) 2016 MIKAMI, Naoki
//-----------------------------------------------------------

#include "SeekBar.hpp"

namespace Mikami
{
    // Slide thumb
    //      If the thumb is not touched, return false
    bool SeekBar::Slide()
    {
        if (!PanelTouched())
        {
            if (slided_) Draw(v_);
            slided_ = false;
            return false;
        }

        uint16_t x, y;
        bool rtn = IsOnThumb(x, y);
        if (rtn)
        {
            v_ = ToValue(Point(x, y));
            Draw(v_, true);
            slided_ = true;
        }

        return rtn;
    }

    // Draw seekbar
    void SeekBar::Draw(float value, bool fill)
    {
        // Erase previous seekbar
        lcd_.SetTextColor(BACK_COLOR_);
        if (ORIENT_ == Holizontal)
            lcd_.FillRect(X_-SIZE_/2, Y_-SIZE_/2, L_+SIZE_+1, SIZE_+1);
        else
            lcd_.FillRect(X_-SIZE_/2, Y_-SIZE_/2, SIZE_+1, L_+SIZE_+1);
 
        Point pt = ToPoint(Saturate(value));    // Position of thumb

        // Draw upper line
        lcd_.SetTextColor(COLOR_H_);
        if (ORIENT_ == Holizontal)
            lcd_.FillRect(pt.x, Y_-W_/4, X_+L_-pt.x, W_/2);
        else
            lcd_.FillRect(X_-W_/4, Y_, W_/2, pt.y-Y_);

        // Draw lower line
        lcd_.SetTextColor(COLOR_L_);
        if ((ORIENT_ == Holizontal) && ((pt.x-X_) > 0))
            lcd_.FillRect(X_, Y_-W_/2, pt.x-X_, W_);
        if ((ORIENT_ == Vertical) && ((Y_+L_-pt.y) > 0))
            lcd_.FillRect(X_-W_/2, pt.y, W_, Y_+L_-pt.y);

        // Draw thumb
        lcd_.SetTextColor(CREATED_COLOR_);
        if (fill)
            lcd_.FillCircle(pt.x, pt.y, SIZE_/2);
        else
            lcd_.DrawCircle(pt.x, pt.y, SIZE_/2);
    }

    // If touched position is on the button, return true
    bool SeekBar::IsOnThumb(uint16_t &x, uint16_t &y)
    {
        x = state_.touchX[0];
        y = state_.touchY[0];

        Point pt = ToPoint(v_);
        if (ORIENT_ == Holizontal)
        {
            if ( (pt.x-SIZE_/5 <= x) && (x <= pt.x+SIZE_/5) &&
                 (pt.y-SIZE_ <= y) && (y <= pt.y+SIZE_) ) return true;
        }
        else
        {
            if ( (pt.x-SIZE_ <= x) && (x <= pt.x+SIZE_) &&
                 (pt.y-SIZE_/5 <= y) && (y <= pt.y+SIZE_/5) ) return true;
        }

        return false;
    }

    SeekBar::Point SeekBar::ToPoint(float value)
    {
        if (ORIENT_ == Holizontal)
            return Point(X_ + L_*(value - MIN_)/(MAX_ - MIN_), Y_);
        else
            return Point(X_, Y_ + L_ - L_*(value - MIN_)/(MAX_ - MIN_));
    }

    float SeekBar::ToValue(Point pt)
    {
        float value;
        if (ORIENT_ == Holizontal)
            value = (pt.x - X_)*(MAX_ - MIN_)/(float)L_ + MIN_;
        else
            value = -(pt.y - Y_ - L_)*(MAX_ - MIN_)/(float)L_ + MIN_;
        return Saturate(value);
    }

    float SeekBar::Saturate(float value)
    {
        if (value < MIN_) value = MIN_;
        if (value > MAX_) value = MAX_;
        return value;
    }
}