Question

我正在为动画编写用户控件它使用内部ImageList来存储动画图像，并在循环中一个接一个地绘制这是整个代码：

public partial class Animator : UserControl
{
    public event EventHandler OnLoopElapsed = delegate { };
    private ImageList imageList = new ImageList();
    private Timer timer;
    private bool looping = true;
    private int index;
    private Image newImage;
    private Image oldImage;

    public Animator()
    {
        InitializeComponent();

        base.DoubleBuffered = true;

        timer = new Timer();
        timer.Tick += timer_Tick;
        timer.Interval = 50;
    }

    public bool Animate
    {
        get { return timer.Enabled; }
        set
        {
            index = 0;
            timer.Enabled = value;
        }
    }

    public int CurrentIndex
    {
        get { return index; }
        set { index = value; }
    }

    public ImageList ImageList
    {
        set
        {
            imageList = value;
            Invalidate();
            index = 0;
        }

        get { return imageList; }
    }

    public bool Looping
    {
        get { return looping; }
        set { looping = value; }
    }

    public int Interval
    {
        get { return timer.Interval; }
        set { timer.Interval = value; }
    }

    private void timer_Tick(object sender, EventArgs e)
    {
        if (imageList.Images.Count == 0)
            return;

        Invalidate(true);
        index++;

        if (index >= imageList.Images.Count)
        {
            if (looping)
                index = 0;
            else
                timer.Stop();

            OnLoopElapsed(this, EventArgs.Empty);
        }
    }

    protected override void OnPaintBackground(PaintEventArgs e)
    {
        if (oldImage != null)
            e.Graphics.DrawImage(oldImage, ClientRectangle);
        else
            e.Graphics.Clear(BackColor);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        Graphics g = e.Graphics;

        if (imageList.Images.Count > 0)
        {
            newImage = imageList.Images[index];
            g.DrawImage(newImage, ClientRectangle);
            oldImage = newImage;
        }
        else
        {
            e.Graphics.Clear(BackColor);
        }
    }
}

动画看起来非常漂亮和顺畅但问题是其周围的矩形被漆成黑色我在这里缺少什么？

我在WPF中看到非常流畅的透明动画here，
我已经在它后面放了一些标签，我希望它们可以通过旋转轮看到它们但我不太清楚WPF在WPF中构建这样的控件。

任何想法或WPF示例代码都将受到赞赏。

Answer 1

这是通过从构造函数中删除此行来解决的：

base.DoubleBuffered = true;

现在控件完全透明，即使在更改图像时也是如此。

动画师控制的透明度

1 个答案: