Question

到目前为止，我没有回答，如果有人知道如何解决这个问题，请告诉我。感谢

我有以下情况：

我在UI的中心画了两个椭圆，红色的X.

我正在使用椭圆中心将它们拖到我想要的任何地方。它的效果非常好，如果我没有点击红色的X，我可以看到每次鼠标移动都会重新绘制椭圆。

我遇到的问题是：

每当我点击红色X时，我就会停止看到Ellipses重新绘制。但是一旦LeftButton上升，椭圆就会到达正确的位置。

有没有人知道可能会发生什么？

提前致谢。

[EDIT1]

    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得到了满足。

[EDIT2]

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

确保该变量为真。

[EDIT3]

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

[Edit4]

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();
        }
    }

线总是可以击中

0 个答案: