矢量图控件VectorDraw使用教程：ActionUtility对象

在上一文《矢量图控件VectorDraw使用教程：添加vdFramedControl (Visual C# 2005)》中，我们介绍了如何将VDF vdFramedControl控件添加到VS2005中。接下来，我们将在VS中演示一些更为复杂的例子。

ActionUtility对象可用于询问客户是否需要在程序中输入一个点、矩形或者距离等数据。如何用户需要数据一个点，你可以调用下列代码：

gPoint userpoint;
vdFC.BaseControl.ActiveDocument.Prompt("Select a Point:");
//The user can either click a point or type at the command line a point like
5,5,2
StatusCode ret =
vdFC.BaseControl.ActiveDocument.ActionUtility.getUserPoint(out userpoint);
vdFC.BaseControl.ActiveDocument.Prompt(null);
if (ret == StatusCode.Success){
MessageBox.Show("The user selected: x:" + userpoint.x.ToString() + " y:" +
userpoint.y.ToString() + " z:" + userpoint.z.ToString() + " In UCS(user
coordinate system)");
}

也可以对上述代码做一些修改，在输入一个点，从而创建一个矩形，代码如下：

vdFC.BaseControl.ActiveDocument.New();
gPoint userpoint;
vdFC.BaseControl.ActiveDocument.Prompt("Select a Point:");
//The user can either click a point or type at the command line a point like
5,5,2
StatusCode ret =
vdFC.BaseControl.ActiveDocument.ActionUtility.getUserPoint(out userpoint);
vdFC.BaseControl.ActiveDocument.Prompt(null);
if (ret == StatusCode.Success){
MessageBox.Show("The user selected: x:" + userpoint.x.ToString() + " y:"
+ userpoint.y.ToString() + " z:" + userpoint.z.ToString() + " In UCS(user
coordinate system)");
}
vdFC.BaseControl.ActiveDocument.Prompt("Other corner:");
//The user can either click a point or type at the command line a point like
5,5,2
object ret2 =
vdFC.BaseControl.ActiveDocument.ActionUtility.getUserRect(userpoint);
vdFC.BaseControl.ActiveDocument.Prompt(null);
Vector v = ret2 as Vector;
if (v != null) {
double angle = v.x;
double width = v.y;
double height = v.z;
//Calculate the point the user clicked.
//Use polar command to find the bottom right point moving width distance
from the initial point.
gPoint userpoint2 = userpoint.Polar(0.0, width);
//Use the polar again to go up height distance to find the upper right
point.
userpoint2 = userpoint2.Polar(VectorDraw.Geometry.Globals.HALF_PI,
height);
MessageBox.Show("The user selected 2nd point : x:" +
userpoint2.x.ToString() + " y:" + userpoint2.y.ToString() + " z:" +
userpoint2.z.ToString() + " In UCS(user coordinate system)");
vdFC.BaseControl.ActiveDocument.CommandAction.CmdRect(userpoint,
userpoint2);
}