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engines/gob/minigames/geisha/meter.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * This file is dual-licensed.
+ * In addition to the GPLv3 license mentioned above, this code is also
+ * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
+ * full text of the license.
+ *
+ */
+
+#include "common/util.h"
+
+#include "gob/surface.h"
+
+#include "gob/minigames/geisha/meter.h"
+
+namespace Gob {
+
+namespace Geisha {
+
+Meter::Meter(int16 x, int16 y, int16 width, int16 height, uint8 frontColor,
+			 uint8 backColor, int32 maxValue, Direction direction) :
+	_x(x), _y(y), _width(width), _height(height), _frontColor(frontColor),
+	_backColor(backColor), _value(0), _maxValue(maxValue), _direction(direction),
+	_needUpdate(true), _surface(nullptr) {
+
+}
+
+Meter::~Meter() {
+	delete _surface;
+}
+
+int32 Meter::getMaxValue() const {
+	return _maxValue;
+}
+
+int32 Meter::getValue() const {
+	return _value;
+}
+
+void Meter::setValue(int32 value) {
+	value = CLIP<int32>(value, 0, _maxValue);
+	if (_value == value)
+		return;
+
+	_value = value;
+	_needUpdate = true;
+}
+
+void Meter::setMaxValue() {
+	setValue(_maxValue);
+}
+
+int32 Meter::increase(int32 n) {
+	if (n < 0)
+		return decrease(-n);
+
+	int32 overflow = MAX<int32>(0, (_value + n) - _maxValue);
+
+	int32 value = CLIP<int32>(_value + n, 0, _maxValue);
+	if (_value == value)
+		return overflow;
+
+	_value = value;
+	_needUpdate = true;
+
+	return overflow;
+}
+
+int32 Meter::decrease(int32 n) {
+	if (n < 0)
+		return increase(-n);
+
+	int32 underflow = -MIN<int32>(0, _value - n);
+
+	int32 value = CLIP<int32>(_value - n, 0, _maxValue);
+	if (_value == value)
+		return underflow;
+
+	_value = value;
+	_needUpdate = true;
+
+	return underflow;
+}
+
+void Meter::draw(Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom) {
+	if (!_surface) {
+		_surface = new Surface(_width, _height, dest.getBPP());
+		_needUpdate = true;
+	}
+
+	update();
+
+	left   = CLIP<int16>(_x              , 0, dest.getWidth () - 1);
+	top    = CLIP<int16>(_y              , 0, dest.getHeight() - 1);
+	right  = CLIP<int16>(_x + _width  - 1, 0, dest.getWidth () - 1);
+	bottom = CLIP<int16>(_y + _height - 1, 0, dest.getHeight() - 1);
+
+	dest.blit(*_surface, left - _x, top - _y, _width, _height, left, top);
+}
+
+void Meter::update() {
+	if (!_needUpdate)
+		return;
+
+	_needUpdate = false;
+
+	_surface->fill(_backColor);
+
+	int32 n = (int32)floor((((float) _width) / _maxValue * _value) + 0.5);
+	if (n <= 0)
+		return;
+
+	if (_direction == kFillToLeft)
+		_surface->fillRect(_width - n, 0, _width - 1, _height - 1, _frontColor);
+	else
+		_surface->fillRect(0         , 0, n - 1, _height - 1, _frontColor);
+}
+
+} // End of namespace Geisha
+
+} // End of namespace Gob