需要绘制 3 条简单的条纹 JES 绘制条纹

Question

我需要制作三条条纹第一个需要形状高度的 40% 和 256 像素宽红色分量从 0-255 逐渐增加并水平遍历图像

第二种是形状高度的20%，相同宽度（高度300）纯绿色

第三是形状高度的40%，蓝色将从255-0减少

我在第二个 for 循环（rheight，rheight）上不断收到错误请帮忙！！

def drawLines():
  height = int(input("Enter Height: "))
  width = 256
  picture = makeEmptyPicture(width,height)
  rheight = height*0.4
  redValue = 0
  for y in range(0,height):
    for x in range(0,width):
      pixel = getPixel(picture, x, y)
      color = makeColor(redValue,0,0)
      setColor(pixel, color)
    redValue = redValue + 50
  explore(picture)

  for y in range(rheight,rheight):    
    for x in range(0, width):         
       pixel = getPixel(picture, x, y)
       color = makeColor(0, 0, 0)      # Change the current pixel to black
       setColor(pixel, color)
  explore(picture)                   

Answer 1

关于你的错误：

The error was: 1st arg can't be coerced to int
Inappropriate argument type.
An attempt was made to call a function with a parameter of an invalid type. 
This means that you did something such as trying to pass a string to a method 
that is expecting an integer.

这是因为 range() 函数需要integers作为参数。

当你执行rheight = height*0.4时，由于0.4是一个浮点数，python/jython 解释器也会计算 "height*0.4" 作为浮点数。导致"rheight"是一个浮点数。

修复：您必须显式cast值为整数：

rheight = int(height*0.4)

Answer 2

一种将颜色值递增 1 并避免高度级别的简单方法：

def d():
  file = pickAFile()
  pic = makePicture(file)
  w= getWidth(pic)
  h= getHeight(pic)
  show (pic)
  newPic = makeEmptyPicture(w,h)
  for y in range (0 ,h-1):  
    for x in range(0,w-1):
      pixel = getPixel(pic, x, y)
      newPixel = getPixel(newPic,x, y)
      if(y == h*0.4):
        #the red value will increase incrementally by one as the x value increases
        color = makeColor(x,0,0)
      else:
        color = getColor(pixel)
      setColor(newPixel, color)
  writePictureTo(newPic, r"D:temp.jpg")
  explore(newPic)

只需根据需要更改颜色和水平或垂直值和参数。遵循这种类型的逻辑将得到结果