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engines/zvision/scripting/controls/lever_control.h

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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/>.
+ *
+ */
+
+#ifndef ZVISION_LEVER_CONTROL_H
+#define ZVISION_LEVER_CONTROL_H
+
+#include "common/list.h"
+#include "common/path.h"
+#include "common/rect.h"
+#include "math/vector2d.h"
+#include "zvision/scripting/control.h"
+
+namespace Video {
+	class VideoDecoder;
+}
+
+namespace ZVision {
+
+// Only used in Zork Nemesis, handles draggable levers (te2e, tm7e, tp2e, tt2e, tz2e)
+class LeverControl : public Control {
+public:
+	LeverControl(ZVision *engine, uint32 key, Common::SeekableReadStream &stream);
+	~LeverControl() override;
+
+private:
+
+	struct PathSegment {
+		PathSegment(uint a, uint t) : angle(Math::deg2rad<float>(a)), toFrame(t), direction(cos(angle), -sin(angle)) {}
+
+		float angle;	// Radians
+		uint toFrame;
+		Math::Vector2d direction;	// NB unit vector upon initialisation
+		float distance = 1.0f;
+	};
+
+	struct FrameInfo {
+		Common::Rect hotspot;
+		Common::List<PathSegment> paths;
+		Common::List<uint> returnRoute;
+	};
+
+private:
+	Video::VideoDecoder *_animation;
+
+	int _cursor;
+	Common::Rect _animationCoords;
+	bool _mirrored;
+	uint _frameCount;
+	uint _startFrame;
+	Common::Point _hotspotDelta;
+	FrameInfo *_frameInfo;
+
+	uint _currentFrame;
+	uint _lastRenderedFrame;
+	bool _mouseIsCaptured;
+	bool _isReturning;
+	Common::Point _gripOffset;
+	Common::List<uint>::iterator _returnRoutesCurrentProgress;
+	uint _returnRoutesCurrentFrame;
+	const uint8 _returnFramePeriod = 60;	// milliseconds
+	uint32 _accumulatedTime;
+
+public:
+	bool onMouseDown(const Common::Point &screenSpacePos, const Common::Point &backgroundImageSpacePos) override;
+	bool onMouseUp(const Common::Point &screenSpacePos, const Common::Point &backgroundImageSpacePos) override;
+	bool onMouseMove(const Common::Point &screenSpacePos, const Common::Point &backgroundImageSpacePos) override;
+	bool process(uint32 deltaTimeInMillis) override;
+
+private:
+	void parseLevFile(const Common::Path &fileName);
+	void renderFrame(uint frameNumber);
+	void getLevParams(const Common::String &inputStr, Common::String &parameter, Common::String &values);
+	uint getNextFrame(Common::Point &deltaPos);
+};
+
+} // End of namespace ZVision
+
+#endif