Question

我需要使用添加线在几个城市之间画一条线。城市坐标取自列表。但是，我不知道我应该如何输入结束坐标。到目前为止，这是代码：

def a2level1():
  cityXCoordinate=[ 43, 93,180,205,254,310,326,348,372,398]
  cityYCoordinate=[308,145, 82,199,335,373,432,346,333,263]

  map = makePicture()
  show(map)
  cities =  [requestInteger("Enter the number of cities you would like to visit")]
  for number in cities:
    print number
    for number in range(0,number):
      print number
      city = [requestInteger("Please choose a city number")]
      while city <= number:
          city = [requestInteger("Please choose a city number")]
          addLine(map,cityXCoordinate[city],cityYCoordinate[city], cityXCoordinate[city], cityYCoordinate[city])


  repaint(map)

Answer 1

我分别命名两个城市的x和y坐标，并将它们缩小以便于阅读：

#addLine(map,cityXCoordinate[city],cityYCoordinate[city],
#cityXCoordinate[city], cityYCoordinate[city])

cityXCoordinate1= x1
cityYCoordinate1 = y1
cityXCoordinate2 = x2
cityYCoordinate2 = y2

在这种情况下，我不是重新绘制图像，而是创建第二张图像，因此第一张图像不会被覆盖，这是您的选择。

#Find the max height and width of your map
w= getWidth (map)
h = getHeight(map)
newPic = makeEmptyPicture(w,h)

#loop through the coordinates of the map
for y in range (0,h):
  for x in range (0, w):

  #select the points forming a straight line between the two points
  if (x==((y-y1)*(x2-x1)/(y2-y1)+x1)):
    newPxl= getPixel(newPic,x,y)
    #color those pixels black
    color = makeColor(0,0,0)
    setColor (newPxl, color)
  else:
    #color the remaining map as it is
    pxl = getPixel(pic, x, y)
    newPxl= getPixel(newPic,x,y)
    color = getColor(pxl)
    setColor (newPxl, color)

使用列表在添加行中使用结束x，y坐标的内容

1 个答案: