是否可以从循环中取消绘制先前绘制的形状？泽尔图形 Python

Question

我想知道是否可以从循环中取消绘制以前绘制的形状。我有这个功能，可以在单击时创建正方形，但是我想这样做，以便在第二次单击同一区域时，正方形将取消绘制。

from graphics import *


def createGrid():
    X = 0
    Y = 0
    gridSize = 5
    for i in range(1, gridSize + 1):
        for j in range(1, gridSize + 1):
            gridSquare = Rectangle(Point(X, Y), Point(X + 100, Y + 100))
            gridSquare.draw(win)
            X = X + 100
        Y = Y + 100
        X = 0


def editMode():
    SelectedSquare = []
    instruction = input("> ")
    if instruction == "s":
        selectionMode(SelectedSquare)


def selectionMode(SelectedSquare):
    editSquare = Rectangle(Point(0, 0), Point(20, 20))
    editSquare.setFill("black")
    editSquare.draw(win)
    while True:
        selection = win.getMouse()
        clickXPos = selection.getX()
        clickYPos = selection.getY()
        if clickXPos > 20 and clickYPos > 20:
            PosX, PosY = clickXPos - (clickXPos % 100), clickYPos - (clickYPos % 100)
            SelectedSquare = SelectedSquare + [Point(PosX, PosY)]
            rect = Rectangle(Point(PosX, PosY), Point(PosX + 100, PosY + 100))
            rect.setWidth(5)
            rect.draw(win)
        else:
            editSquare.undraw()
            break


win = GraphWin("GRID", 500, 500)
createGrid()
while True:
    editMode()

如您所见，点击后，选中的网格方块周围会出现较粗的边框，我希望能够 1) 如果再次点击，去除加厚的边框 2) 能够去除网格正方形周围的所有加厚边框但我似乎无法弄清楚这一点，我们将不胜感激！

Answer 1

一般的问题似乎是您的程序没有底层数据结构或逻辑 -- 您首先绘制界面，然后尝试使其行为定义程序。

下面我已经修补了你的代码，让所选方块列表上的点记住绘制的矩形以突出显示它们，因此如果再次选择它们，可以撤消突出显示并删除点：

from graphics import *

GRID_SIZE = 5
SQUARE_SIZE = 100
EDIT_BUTTON_SIZE = 20
BORDER_WIDTH = 5

def createGrid():
    X, Y = 0, 0

    for _ in range(1, GRID_SIZE + 1):
        for _ in range(1, GRID_SIZE + 1):
            gridSquare = Rectangle(Point(X, Y), Point(X + SQUARE_SIZE, Y + SQUARE_SIZE))
            gridSquare.draw(win)
            X += SQUARE_SIZE

        Y += SQUARE_SIZE
        X = 0

def editMode():
    selectedSquares = []
    instruction = input("> ")

    if instruction == "s":
        selectionMode(selectedSquares)

def checkSelected(point, squares):
    for selected in squares:
        if point.getX() == selected.getX() and point.getY() == selected.getY():
            return selected

    return None

def selectionMode(selectedSquares):
    editSquare = Rectangle(Point(0, 0), Point(EDIT_BUTTON_SIZE, EDIT_BUTTON_SIZE))
    editSquare.setFill("black")
    editSquare.draw(win)

    while True:
        selection = win.getMouse()
        clickXPos = selection.getX()
        clickYPos = selection.getY()

        if clickXPos <= EDIT_BUTTON_SIZE and clickYPos <= EDIT_BUTTON_SIZE:
            break

        PosX, PosY = clickXPos - clickXPos % SQUARE_SIZE, clickYPos - clickYPos % SQUARE_SIZE
        point = Point(PosX, PosY)
        selected = checkSelected(point, selectedSquares)

        if selected:
            selected.rect.undraw()
            selectedSquares.remove(selected)
        else:
            rect = Rectangle(point, Point(PosX + SQUARE_SIZE, PosY + SQUARE_SIZE))
            rect.setWidth(BORDER_WIDTH)
            rect.draw(win)

            point.rect = rect

            selectedSquares.append(point)

    editSquare.undraw()

win = GraphWin("GRID", GRID_SIZE * SQUARE_SIZE, GRID_SIZE * SQUARE_SIZE)

createGrid()

while True:
    editMode()

但这只是创可贴——随着您添加更多功能，缺乏数据结构和拼写逻辑的问题将继续困扰您。

是否可以从循环中取消绘制先前绘制的形状？泽尔图形 Python

Is it possible to undraw a previously drawn shape from a loop? Zelle Graphics Python

python

python-3.x

zelle-graphics