在C＃中如何实现蚂蚁线啊！多谢！
在C＃中如何实现蚂蚁线啊！多谢！
求高手详细说明一下，我是C＃新手
[解决办法]
ControlPaint.DrawReversibleFrame 方法
在屏幕上的指定边界内，按指定背景色绘制处于指定状态的可逆框架。
public static void DrawReversibleFrame (
Rectangle rectangle,
Color backColor,
FrameStyle style
)
参数
rectangle
代表要绘制矩形的尺寸的 Rectangle（采用屏幕坐标）。
backColor
框架的背景的 Color。
style
FrameStyle 值之一，它指定框架的样式。
Dashed 细虚线边框。
Thick 粗实线边框。
下面的代码示例阐释了如何使用 FrameStyle 枚举。要运行该示例，请将以下代码粘贴到一个名为 Form1 的包含多个控件的窗体中。此示例假定将 MouseDown、MouseMove 和 MouseUp 事件连接到该示例中定义的事件处理程序方法。
// The following three methods will draw a rectangle and allow
// the user to use the mouse to resize the rectangle. If the
// rectangle intersects a control 's client rectangle, the
// control 's color will change.
bool isDrag = false;
Rectangle theRectangle = new Rectangle
(new Point(0, 0), new Size(0, 0));
Point startPoint;
private void Form1_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
{
// Set the isDrag variable to true and get the starting point
// by using the PointToScreen method to convert form
// coordinates to screen coordinates.
if (e.Button==MouseButtons.Left)
{
isDrag = true;
}
Control control = (Control) sender;
// Calculate the startPoint by using the PointToScreen
// method.
startPoint = control.PointToScreen(new Point(e.X, e.Y));
}
private void Form1_MouseMove(object sender,
System.Windows.Forms.MouseEventArgs e)
{
// If the mouse is being dragged,
// undraw and redraw the rectangle as the mouse moves.
if (isDrag)
// Hide the previous rectangle by calling the
// DrawReversibleFrame method with the same parameters.
{
ControlPaint.DrawReversibleFrame(theRectangle,
this.BackColor, FrameStyle.Dashed);
// Calculate the endpoint and dimensions for the new
// rectangle, again using the PointToScreen method.
Point endPoint = this.PointToScreen(new Point(e.X, e.Y));
int width = endPoint.X-startPoint.X;
int height = endPoint.Y-startPoint.Y;
theRectangle = new Rectangle(startPoint.X,
startPoint.Y, width, height);
// Draw the new rectangle by calling DrawReversibleFrame
// again.
ControlPaint.DrawReversibleFrame(theRectangle,
this.BackColor, FrameStyle.Dashed);
}
}
private void Form1_MouseUp(object sender,
System.Windows.Forms.MouseEventArgs e)
{
// If the MouseUp event occurs, the user is not dragging.
isDrag = false;
// Draw the rectangle to be evaluated. Set a dashed frame style
// using the FrameStyle enumeration.
ControlPaint.DrawReversibleFrame(theRectangle,
this.BackColor, FrameStyle.Dashed);
// Find out which controls intersect the rectangle and
// change their color. The method uses the RectangleToScreen
// method to convert the Control 's client coordinates
// to screen coordinates.
Rectangle controlRectangle;
for(int i = 0; i < Controls.Count; i++)
{
controlRectangle = Controls[i].RectangleToScreen
(Controls[i].ClientRectangle);
if (controlRectangle.IntersectsWith(theRectangle))
{
Controls[i].BackColor = Color.BurlyWood;
}
}
// Reset the rectangle.
theRectangle = new Rectangle(0, 0, 0, 0);
}
[解决办法]
from
http://blog.sina.com.cn/u/589d32f50100098p
delegate void LINEDDAPROC(int X, int Y, IntPtr lpData);
[DllImport( "gdi32.dll ")]
static extern int LineDDA(int nXStart, int nYStart, int nXEnd, int nYEnd,
LINEDDAPROC lpLineFunc, IntPtr lpData);
private const byte PT_CLOSEFIGURE = 1;
private const byte PT_LINETO = 2;
private const byte PT_BEZIERTO = 4;
private const byte PT_MOVETO = 6;
[DllImport( "gdi32.dll ")]
static extern int SetPixel(IntPtr hdc, int X, int Y, int crColor);
GraphicsPath graphicsPath = new GraphicsPath();
private int counter = 0;
private IntPtr graphicsHandle = IntPtr.Zero;
//设计Zswang 2007-04-30 wjhu111#21cn.com 尊重作者,转贴请注明出处
private void button1_Click(object sender, EventArgs e)
{
graphicsPath.ClearMarkers();
graphicsPath.AddRectangle(new Rectangle(10, 10, 100, 100));
timer1.Interval = 100;
timer1.Enabled = true;
}
private void MovingDots(int X, int Y, IntPtr lpData)
{
counter = (counter + 1) % 15;
Color vColor;
if (counter < 5)
vColor = Color.White;
else if (counter < 12)
vColor = Color.Red;
else vColor = Color.Blue;
SetPixel(graphicsHandle, X, Y, vColor.R | vColor.G < < 8 | vColor.B < < 16);
}
private void timer1_Tick(object sender, EventArgs e)
{
graphicsHandle = Graphics.FromHwnd(Handle).GetHdc();
for (int i = 0; i < graphicsPath.PathPoints.Length; i++)
{
if (graphicsPath.PathTypes[i] == (byte)(PT_CLOSEFIGURE | PT_LINETO))
{
for (int j = i; j > = 0; j--)
{
if (graphicsPath.PathTypes[j] == PT_MOVETO)
{
LineDDA(
(int)graphicsPath.PathPoints[i].X,
(int)graphicsPath.PathPoints[i].Y,
(int)graphicsPath.PathPoints[j].X,
(int)graphicsPath.PathPoints[j].Y,
MovingDots, IntPtr.Zero);
break;
}
}
continue;
}
if (i == graphicsPath.PathPoints.Length - 1)
LineDDA(
(int)graphicsPath.PathPoints[i].X,
(int)graphicsPath.PathPoints[i].Y,
(int)graphicsPath.PathPoints[0].X,
(int)graphicsPath.PathPoints[0].Y,
MovingDots, IntPtr.Zero);
else
LineDDA(
(int)graphicsPath.PathPoints[i].X,
(int)graphicsPath.PathPoints[i].Y,
(int)graphicsPath.PathPoints[i + 1].X,
(int)graphicsPath.PathPoints[i + 1].Y,
MovingDots, IntPtr.Zero);
}
}
