util_weather.hpp

/*
* Copyright (c) 2010 Jice
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
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*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JICE ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL JICE BE LIABLE FOR ANY
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class Weather {
public :
	void init(int width, int height);
	void update(float elapsed);
	float getCloud(int x, int y); // 0.0 : dark cloud, 1.0 : no cloud
	float getLightning(int x, int y); // 0.0 : no lightning. 1.0 : full lightning light
	bool hasRainDrop(); // call for each cell on the map
	// when scrolling the map on the game side
	void move(int dx, int dy);
	// description of current weather
	const char *getWeather();
	const TCODColor &getAmbientLightColor() { return ambientColor; }
	// timeInSecond : between 0 and 3600*24
	void calculateAmbient(float timeInSeconds);
	// how fast the weather is changing. 0 : never changes, 1 : default > 1 : faster...
	void setChangeFactor(float f) { changeFactor = f; }
	// 0 : bad weather. 1 : good weather
	float getIndicator() { return indicator; }
	// to alter the weather 
	float getIndicatorDelta() { return indicatorDelta; }
	void setIndicatorDelta(float v) { indicatorDelta=CLAMP(-1.0f,1.0f,v); }
protected :
	typedef struct {
		int posx,posy;
		float intensity; // 0-1
		float life; // in seconds
		int radius; // squared
		float noisex;
	} lightning_t;

	float indicator; // 0 : bad, 1 : good
	float indicatorDelta;
	float noisex,noisey; // position in the noise space
	float dx,dy; // sub cell cloud map position
	float changeFactor;
	TCODHeightMap *map;
	TCODList<lightning_t> lightnings;
	TCODColor ambientColor;
};