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到目前为止,我没有得到任何答案,如果有人知道如何解决这个问题.. 请告诉我。谢谢

我有以下情况:

我在 UI 的中心绘制了两个带有红色 X 的椭圆。

我正在使用中心椭圆将它们拖到我想要的屏幕上。它工作得非常好,如果我不点击红色的 X,我可以看到椭圆在每次鼠标移动时都被重新绘制。

我遇到的问题是这样的:

每次单击红色 X 时,我都不再看到椭圆重新绘制。但是一旦 LeftButton 向上,Ellipses 就会转到正确的位置。

有没有人知道可能会发生什么?

提前致谢。

[编辑1]

    private void canvasArea_MouseMove(object sender, MouseEventArgs e)
    {
        if ((e.LeftButton == MouseButtonState.Pressed) && flag_centerEllipse_MouseLeftButtonDown)
        {
            flag_UpdateEllipseCenter = true;
            UpdateEllipseCenter();
            DrawingEllipse();
        }
        else
            flag_UpdateEllipseCenter = false;
    }

我确信这两个条件都满足了。

[编辑2]

    private void centerEllipse_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        flag_centerEllipse_MouseLeftButtonDown = true;
    }

确保该变量为真。

[编辑3]

为了帮助澄清我的问题:http ://s14.postimg.org/6sajsb5tp/ellipse.png

[编辑4]

xml代码:

    <Canvas Background="Transparent" Name="canvasArea" MouseLeftButtonDown="canvasArea_MouseLeftButtonDown" MouseMove="canvasArea_MouseMove" MouseLeftButtonUp="canvasArea_MouseLeftButtonUp">
        <TextBlock Canvas.Left="612" Canvas.Top="577" Height="23" Name="tBCreationTime" Text="TextBlock" />
        <TextBlock Canvas.Left="447" Canvas.Top="577" Height="23" Name="tBCoordinates" Text="TextBlock" Width="160" />
        <Ellipse Name="externalEllipse" Height="0" Width="0" MouseLeftButtonDown="externalEllipse_MouseLeftButtonDown" MouseLeftButtonUp="externalEllipse_MouseLeftButtonUp"/>
        <Ellipse Name="centerEllipse" Height="0" Width="0" MouseLeftButtonDown="centerEllipse_MouseLeftButtonDown" MouseLeftButtonUp="centerEllipse_MouseLeftButtonUp"/>
        <Line Name="targetHorizontal"></Line>
        <Line Name="targetVertical"></Line>
    </Canvas>

更新椭圆中心:

    private void UpdateEllipseCenter()
    {
        Point newEllipseCenter = Mouse.GetPosition(canvasArea);

        ellipseCenter = newEllipseCenter;
    }

绘制椭圆和直线:

    private void DrawingEllipse()
    {
        bool addRmvObjcts = true;

        if (mousePositionDown.X != mousePositionUp.X && mousePositionDown.Y != mousePositionUp.Y)
        {
            addRmvObjcts = AddRemoveCanvasObjects(addRmvObjcts);

            if (flag_UpdateEllipseSize || flag_UpdateEllipseCenter)
            {
                externalEllipse.Height = externalEllipse.Width = drawHypotenuse;
            }
            else
            {
                double diffX = mousePositionUp.X - mousePositionDown.X;
                double diffY = mousePositionUp.Y - mousePositionDown.Y;

                drawHypotenuse = Math.Sqrt(Math.Pow((diffX), 2) + Math.Pow((diffY), 2));
                externalEllipse.Height = externalEllipse.Width = drawHypotenuse;

                ellipseCenter.X = ((mousePositionDown.X + ((mousePositionUp.X - mousePositionDown.X) / 2)));
                ellipseCenter.Y = ((mousePositionDown.Y + ((mousePositionUp.Y - mousePositionDown.Y) / 2)));
            }

            AddRemoveCanvasObjects(addRmvObjcts);
            SettingObjectsPosition();
        }
    }
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