C#实现简单的loading提示控件实例代码
自己画一个转圈圈的控件
usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Drawing.Drawing2D;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Threading.Tasks;
usingSystem.Windows.Forms;
namespaceExerciseUIPrj.controls
{
publicpartialclassLoadControl:Control
{
ColorbeginColor=Color.Blue;
ColorendColor=Color.Red;
intwid=10;
intcurindex=0;
Timertimer;
intinstervel=200;
stringloadStr="loading....";
publicLoadControl()
{
InitializeComponent();
SetStyle(ControlStyles.UserPaint|ControlStyles.AllPaintingInWmPaint|ControlStyles.OptimizedDoubleBuffer,true);
this.MinimumSize=newSize(40,80);
if(!DesignMode)
{
Start();
}
}
publicvoidStart()
{
if(timer==null)
{
timer=newTimer();
timer.Interval=instervel;
timer.Tick+=Timer_Tick;
}
timer.Enabled=true;
}
publicvoidStop()
{
if(timer!=null)
{
timer.Enabled=false;
}
}
voidTimer_Tick(objectsender,EventArgse)
{
curindex++;
curindex=curindex>=wid?0:curindex;
Refresh();
}
//计算各种圈圈相关
PointgetPoint(doubled,doubler,Pointcenter)
{
intx=(int)(r*Math.Cos(d*Math.PI/180.0));
inty=(int)(r*Math.Sin(d*Math.PI/180.0));
returnnewPoint(center.X+x,center.Y-y);
}
GraphicsPathgetPath(Pointa,Pointb)
{
Pointc,d,e,f;
inth=2;
Vertical(a,b,h,outc,outd);
Vertical(b,a,h,oute,outf);
GraphicsPathpath=newGraphicsPath();
path.AddPolygon(newPoint[]{c,d,e,f});
path.CloseAllFigures();
returnpath;
}
boolVertical(Pointpointa,Pointpointb,doubleR,outPointpointc,outPointpointd)
{
pointc=newPoint();
pointd=newPoint();
try
{
//（X-xa)^2+(Y-ya)^2=R*R距离公式
//(X-xa)*(xb-xa)+(Y-ya)*(yb-ya)=0垂直
//解方程得两点即为所求点
varcx=pointa.X-(pointb.Y-pointa.Y)*R/Distance(pointa,pointb);
varcy=pointa.Y+(pointb.X-pointa.X)*R/Distance(pointa,pointb);
vardx=pointa.X+(pointb.Y-pointa.Y)*R/Distance(pointa,pointb);
vardy=pointa.Y-(pointb.X-pointa.X)*R/Distance(pointa,pointb);
pointc=newPoint((int)cx,(int)cy);
pointd=newPoint((int)dx,(int)dy);
returntrue;
}
catch
{
//如果A,B两点重合会报错，那样就返回false
returnfalse;
}
}
doubleDistance(doublexa,doubleya,doublexb,doubleyb)
{
doubleL;
L=Math.Sqrt(Math.Pow(xa-xb,2)+Math.Pow(ya-yb,2));
returnL;
}
doubleDistance(Pointpa,Pointpb)
{
returnDistance(pa.X,pa.Y,pb.X,pb.Y);
}
GraphicsPathgetPath(doubled,doubler,Pointc)
{
varp1=getPoint(d,r/2.0,c);
varp2=getPoint(d,r,c);
returngetPath(p1,p2);
}
//算渐变色
Color[]getColors()
{
intdr=(int)((endColor.R-beginColor.R)/(double)wid);
intdg=(int)((endColor.G-beginColor.G)/(double)wid);
intdb=(int)((endColor.B-beginColor.B)/(double)wid);
Listcolors=newList();
for(inti=0;i=wid?cindex-wid:cindex;
g.FillPath(newSolidBrush(colors[cindex]),p);
}
}
//画字符串
voiddrawString(Graphicsg)
{
if(Size.Height>=Size.Width)return;
Rectanglerect=newRectangle(newPoint(Size.Height,0),newSize(Size.Width-Size.Height,Size.Height));
StringFormatsf=newStringFormat();
sf.Alignment=StringAlignment.Center;
sf.LineAlignment=StringAlignment.Center;
g.DrawString(loadStr,Font,Brushes.Black,rect,sf);
}
protectedoverridevoidOnPaint(PaintEventArgspe)
{
base.OnPaint(pe);
Graphicsg=pe.Graphics;
g.SmoothingMode=SmoothingMode.HighQuality;
g.PixelOffsetMode=PixelOffsetMode.HighQuality;
drawRect(g);
drawString(g);
}
protectedoverridevoidOnSizeChanged(EventArgse)
{
base.OnSizeChanged(e);
if(Size.Height>Size.Width)
{
Size=newSize(Size.Height,Size.Height);
}
}
}
}
总结
以上所述是小编给大家介绍的C#实现简单的loading提示控件实例代码，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！