颜色渐变算法 |
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需求：
给定一组数据，给定渐变颜色两端的颜色值，需要根据这组数据中的每个值大小为其分配一个颜色 算法：一个需要用颜色表示值大小的数据集weightlist,给定渐变的起始颜色 colorStart={"red":255,"green":50,"blue":47}，结束颜色colorend ={"red":139,"green":20,"blue":10},minNum=min(weightlist),maxNum=max(weightlist),weightlist中的一个值number，计算其对应的颜色值color \[\frac{number-minNum}{maxNum-minNum}=\frac{color-colorStart}{colorend -colorStart} \]最终颜色值： \[color=\frac{(number-minNum)(colorend -colorStart)}{maxNum-minNum}+colorStart \]将colorR，colorG，colorB分别代入计算 实现 def getColorstr(value): #将rgb颜色转换为16进制 digit = list(map(str, range(10))) + list("ABCDEF") if isinstance(value, tuple): string = '#' for i in value: a1 = i // 16 a2 = i % 16 string += digit[a1] + digit[a2] return string def gerColorOfWeight1(minNum,maxNum,colorStart,colorend,number): #颜色,根据数值均分 colorR=(colorend["red"]-colorStart["red"])*(number-minNum)/(maxNum-minNum)+colorStart["red"] colorG=(colorend["green"]-colorStart["green"])*(number-minNum)/(maxNum-minNum)+colorStart["green"] colorB=(colorend["blue"]-colorStart["blue"])*(number-minNum)/(maxNum-minNum)+colorStart["blue"] color= "rgb("+str(int(colorR))+','+str(int(colorG))+','+str(int(colorB))+')' #color=getColorstr((int(colorR),int(colorG),int(colorB)))#转换为16进制颜色 return color colorYouNeed=gerColorOfWeight1(min(weightlist),max(weightlist),{"red":255,"green":50,"blue":47} ,{"red":139,"green":20,"blue":10} ,1000* errornum/linenum) |
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