色彩随机线性变换

川长思鸟来 2023-10-18 16:34 42阅读 0赞

有时候做一些颜色随机,需要变化,但是跨度太大不好看,最好有一个过度,就是改变一个色值,达成一个循环,这样变化看起来比较柔和.

//获取一个随机颜色位置
        public static float GetLineColorSeed(float colorMin = 0f, float colorMax = 1f)
        {
            float range = colorMax - colorMin;
            float randomrange = range * 6f;
    
            return UnityEngine.Random.Range(0, randomrange);
        }
        //循环变色,colorSeed是颜色的随机基位置,step是每个周期的位置
        public static Color GetLineColor(float colorSeed, float alpha, float step ,float colorMin = 0f, float colorMax = 1f)
        {
    
            float range = colorMax - colorMin;
            float randomrange = range * 6f;
    
            float nowC = (colorSeed + step) % randomrange;
    
            Color color;
            color.a = alpha;
            if (nowC < range)
            {   
                //R 变大
                color.r = nowC % range;
                color.g = colorMin;
                color.b = colorMax;
            }
            else if (nowC < range * 2)
            {
                //B 变小
                color.r = colorMax;
                color.g = colorMin;
                color.b = colorMax - nowC % range;
            }
            else if (nowC < range * 3)
            {
                //G 变大
                color.r = colorMax;
                color.g = colorMin + nowC % range;
                color.b = colorMin;
            }
            else if (nowC < range * 4)
            {
                //R 变小
                color.r = colorMax - nowC % range;
                color.g = colorMax;
                color.b = colorMin;
            }
            else if (nowC < range * 5)
            {
                //B 变大
                color.r = colorMin;
                color.g = colorMax;
                color.b = colorMin + nowC % range; ;
            }
            else
            {
                //G 变小
                color.r = colorMin;
                color.g = colorMax - nowC % range;
                color.b = colorMax;
            }
    
            //Debug.Log( color.ToString());
    
            return color;
        }

调用

//先随机一个颜色.
    float colorSeed = Fun.GetLineColorSeed(0f, 0.7f);
    
    colorStep每次增加,来改变颜色,这样过度比较平滑.
    Color corFrom = Fun.GetLineColor(colorSeed, 1f, colorStep, 0f, 0.7f);
    colorStep += 0.01f;