JES - Jython - 在图像上的点之间画一条线

Question

我正在进行一项任务，我需要在地图上的点之间画一条线。我使用if语句构建它，但这限制了我可以做多少次，所以想要使用循环。

我到目前为止的代码如下所示，我可以添加城市并绘制一条线，但它会为自己绘制一条线而不是从起点到下一点（并继续）

任何人都可以帮忙吗？

def level1():
    cityXvalue = [45,95,182,207,256,312,328,350,374,400]
    cityYvalue = [310,147,84,201,337,375,434,348,335,265]
    # Display the map image
    map = makePicture(getMediaPath("map.png"))
    show(map)
    number = 0
    # Ask user to enter numbers of the cities they wish to visit    
    cities = requestInteger("Enter the number of the city you would like to visit")
    # Draw a line between previously entered point and current one
    while cities > number:
        city = requestInteger("Please choose a city number")
        addLine(map,cityXvalue[city],cityYvalue[city], cityXvalue[city], cityYvalue[city])
    repaint(map)