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我正在尋找如何在C#WinForms程序中繪製透明控件(可以看到它的背後)。半透明的自定義控件
我需要類似下面的圖片。正如你所看到的,在圖像的中心有一個半透明的組件(它真的像一個光標一樣),它正在填充一個圓形的扇區。
我專注於獲得半透明控制,現在,如果我在我的組件上設置透明背景(從標準控件類繼承),它的背景具有相同的父背景顏色。在WinForms中顯然是複雜的獲得透明控件,但圖像是在WinForms程序中獲取的。
你有什麼想法嗎?這可能嗎?
編輯: 很抱歉,如果這是一個重複的問題,我要粘貼如下至極我的代碼是採取其他的程序員,但我包括在鏈接的建議。 (只與有問題的代碼顯示,沒有屬性,無屬性等)
public partial class LoadingCircle : Control
{
public LoadingCircle()
{
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
//Added following StackOverflow
SetStyle(ControlStyles.Opaque, true);
this.BackColor = Color.Transparent;
m_Color = DefaultColor;
GenerateColorsPallet();
GetSpokesAngles();
GetControlCenterPoint();
m_Timer = new Timer();
m_Timer.Tick += new EventHandler(aTimer_Tick);
ActiveTimer();
this.Resize += new EventHandler(LoadingCircle_Resize);
}
void aTimer_Tick(object sender, EventArgs e)
{
m_ProgressValue = ++m_ProgressValue % m_NumberOfSpoke;
Invalidate();
}
protected override void OnPaint(PaintEventArgs e)
{
if (m_NumberOfSpoke > 0)
{
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
int intPosition = m_ProgressValue;
for (int intCounter = 0; intCounter < m_NumberOfSpoke; intCounter++)
{
intPosition = intPosition % m_NumberOfSpoke;
DrawLine(e.Graphics,
GetCoordinate(m_CenterPoint, m_InnerCircleRadius, m_Angles[intPosition]),
GetCoordinate(m_CenterPoint, m_OuterCircleRadius, m_Angles[intPosition]),
m_Colors[intCounter], m_SpokeThickness);
intPosition++;
}
}
base.OnPaint(e);
}
//Added following StackOverflow
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x20; //WS_EX_TRANSPARENT
return cp;
}
}
protected override void OnBackColorChanged(EventArgs e)
{
if (this.Parent != null) Parent.Invalidate(this.Bounds, true);
base.OnBackColorChanged(e);
}
protected override void OnParentBackColorChanged(EventArgs e)
{
this.Invalidate();
base.OnParentBackColorChanged(e);
}
//----- End
private void DrawLine(Graphics _objGraphics, PointF _objPointOne, PointF _objPointTwo,
Color _objColor, int _intLineThickness)
{
using(Pen objPen = new Pen(new SolidBrush(_objColor), _intLineThickness))
{
objPen.StartCap = LineCap.Round;
objPen.EndCap = LineCap.Round;
_objGraphics.DrawLine(objPen, _objPointOne, _objPointTwo);
}
}
private void ActiveTimer()
{
if (m_IsTimerActive)
m_Timer.Start();
else
{
m_Timer.Stop();
m_ProgressValue = 0;
}
GenerateColorsPallet();
Invalidate();
}
}
編輯2:我添加了結果的圖像,你可以看到我的控制(LoadingCircle)的背景它的父(形式)相同,但按鈕保持隱藏狀態。
你有沒有在[MSDN](http://msdn.microsoft.com/en-us/library/wk5b13s4%28v=vs.85%29.aspx採取甘德) – Adam
請查看http://www.c-sharpcorner.com/uploadfile/Nildo/making-transparent-control-using-gdi-and-C-Sharp-updated-to-net-3-5/ – Monah