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68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file slider.cpp Implementation of the horizontal slider widget. */
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#include "../stdafx.h"
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#include "../window_gui.h"
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#include "../window_func.h"
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#include "../strings_func.h"
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#include "../zoom_func.h"
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#include "slider_func.h"
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#include "../safeguards.h"
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static const int SLIDER_WIDTH = 3;
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/**
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* Draw a volume slider widget with know at given value
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* @param r Rectangle to draw the widget in
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* @param value Value to put the slider at
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*/
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void DrawVolumeSliderWidget(Rect r, byte value)
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{
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/* Draw a wedge indicating low to high volume level. */
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const int ha = (r.bottom - r.top) / 5;
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int wx1 = r.left, wx2 = r.right;
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if (_current_text_dir == TD_RTL) std::swap(wx1, wx2);
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const uint shadow = _colour_gradient[COLOUR_GREY][3];
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const uint fill = _colour_gradient[COLOUR_GREY][6];
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const uint light = _colour_gradient[COLOUR_GREY][7];
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const std::vector<Point> wedge{ Point{wx1, r.bottom - ha}, Point{wx2, r.top + ha}, Point{wx2, r.bottom - ha} };
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GfxFillPolygon(wedge, fill);
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GfxDrawLine(wedge[0].x, wedge[0].y, wedge[2].x, wedge[2].y, light);
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GfxDrawLine(wedge[1].x, wedge[1].y, wedge[2].x, wedge[2].y, _current_text_dir == TD_RTL ? shadow : light);
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GfxDrawLine(wedge[0].x, wedge[0].y, wedge[1].x, wedge[1].y, shadow);
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/* Draw a slider handle indicating current volume level. */
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const int sw = ScaleGUITrad(SLIDER_WIDTH);
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if (_current_text_dir == TD_RTL) value = 127 - value;
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const int x = r.left + (value * (r.right - r.left - sw) / 127);
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DrawFrameRect(x, r.top, x + sw, r.bottom, COLOUR_GREY, FR_NONE);
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}
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/**
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* Handle click on a volume slider widget to change the value
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* @param r Rectangle of the widget
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* @param pt Clicked point
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* @param value[in,out] Volume value to modify
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* @return True if the volume setting was modified
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*/
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bool ClickVolumeSliderWidget(Rect r, Point pt, byte &value)
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{
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const int sw = ScaleGUITrad(SLIDER_WIDTH);
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byte new_vol = Clamp((pt.x - r.left - sw / 2) * 127 / (r.right - r.left - sw), 0, 127);
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if (_current_text_dir == TD_RTL) new_vol = 127 - new_vol;
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if (new_vol != value) {
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value = new_vol;
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return true;
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}
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return false;
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}
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