如何在gnuplot中更改图形中条形的颜色？

Question

我有导入数据并作图的代码，但是所有的条形都是紫色的，我想改变每种颜色。我注意到的另一个问题是，它在图形上显示了文件位置，我不希望在该位置。

#loads the asciified image ("/home/userX/Documents/Programmazione/Python projects/imgascii/myascify/ascimg4")
#creates a sheet "foglio1", same number of lines as the asciified image, and distributes text on it on a randomised line

#create the sheet foglio1
def create():
    ref = open("/home/userX/Documents/Programmazione/Python projects/imgascii/myascify/ascimg4")
    charcount = ""
    field = []
    for line in ref:
        for c in line:
            if c != '\n':
                charcount += ' '
            if c == '\n':
                charcount += '*' #<--- YOU GONNA NEED TO MAKE THIS A SPACE IN A FOLLOWING FUNCTION IN THE WRITER.PY PROGRAM
                for i in range(50):#<------- VALUE ADJUSTMENT FROM WRITER.PY GOES HERE(default : 50):
                    charcount += ' '
                charcount += '\n'
        break
    for line in ref:
        field.append(charcount)
    return(field)

#turn text in a list of lines and trasforms the lines in a list of strings 

def poemln():
    txt = open("/home/gcg/Documents/Programmazione/Python projects/imgascii/writer/poem")
    arrays = []
    for line in txt:
        arrays.append(line)
    txt.close()
    return(arrays)

#rander is to be called in ripimg()
def rander(rando, fldepth):
    riplns = [] 
    for i in range(fldepth):
        riplns.append(randint((rando)-1,(rando)+1)
    return(riplns) #<---- THIS RETURN GIVES SyntaxError upon execution

#opens a rip on the side of the image.
def ripimg():
    upmost = randint(160, 168)
    positions = []
    fldepth = 52 #<-----value is manually input as in DISTRIB function.
    positions = rander(upmost,fldepth)
    return(positions)

Answer 1

...如果您自己尚未找到解决方案... 例如，您可以在数据中添加一列，将颜色定义为十六进制数字，例如0xff0000为红色。然后在带有linecolor rgb variable的plot命令中，它将采用第4列的颜色（实际上是1:3:4: xtic(2)的最后一列，不包括xtic(2)。） 为了删除作为图例的文件名，可以在plot命令或前一行notitle中添加unset key。

如果您希望使用颜色名称而不是颜色编号，请选中​​此gnuplot: apply colornames from datafile

代码：

### change color of boxes
reset session

$Data <<EOD
1  One     1  0xff0000
2  Two     4  0x00ff00
3  Three   9  0x0000ff
4  Four   16  0xff00ff
5  Five   25  0xffff00
6  Six    36  0x00ffff
EOD

set boxwidth 0.7
plot $Data u 1:3:4:xtic(2) w boxes fill solid 1.0 lc rgb var notitle
### end of code

结果：