我的编程技能不太好,而且他们在 C# 方面仍然非常业余计时器启动并使用 Drawcontext.DrawText 方法在屏幕上显示任何消息,但如您所见,如果我尝试引入 DrawContext 的新变量并将 draw 值分配给它,我将无法访问 on_time_event 中的绘图变量……它给出和异常...因为 Draw 上下文的新变量从未赋值我该怎么办?请在这方面提供任何帮助,我会非常有帮助
class angle
{
System.Timers.Timer timer = new System.Timers.Timer();
bool timer_start = false;
int index = 5;
public DrawingContext draw_contex;
public void angle_between_left_shoulder(Skeleton sk1, DrawingContext draw, JointType
Shoulder_cntre,
JointType Shoulder_left, JointType Elbow_left, KinectSensor sen)
{
//draw_contex= draw;
Joint sh_cntr = sk1.Joints[Shoulder_cntre];
Joint sh_left = sk1.Joints[Shoulder_left];
Joint elb_left = sk1.Joints[Elbow_left];
Vector3 v_shoulder = new Vector3(sh_cntr.Position.X, sh_left.Position.Y,
sh_cntr.Position.Z);
Vector3 v_should_l = new Vector3(sh_left.Position.X, sh_left.Position.Y,
sh_left.Position.Z);
Vector3 v_elbow_l = new Vector3(elb_left.Position.X, elb_left.Position.Y,
elb_left.Position.Z);
Vector3 va = v_shoulder - v_should_l;
Vector3 vb = v_elbow_l - v_should_l;
va = Vector3.Normalize(va);
vb = Vector3.Normalize(vb);
float len_prod = va.Length() * va.Length();
float dot_pro = Vector3.Dot(va, vb);
double angle = Math.Acos(dot_pro);
angle = angle * 180 / Math.PI;
angle = 180 - angle;
System.Windows.Point shoul_l = this.point_toScreen(sh_left.Position, sen);
draw.DrawText(new FormattedText(angle.ToString("0"), new
System.Globalization.CultureInfo("en-us"),
FlowDirection.LeftToRight,
new Typeface("Verdana"), 16, Brushes.OrangeRed),
new System.Windows.Point(shoul_l.X+10, shoul_l.Y +20));
if (angle > 70 && angle < 90)
{
if (timer_start == false)
{
timer.Interval = 2000;
timer.Start();
timer.Elapsed += new ElapsedEventHandler(on_time_event);
}
}
}
void on_time_event(object sender, ElapsedEventArgs e)
{
--index;
if (index != 0)
{
MessageBox.Show(index.ToString());
/*
draw_contex.DrawText(new FormattedText(index.ToString("0"), new
System.Globalization.CultureInfo("en-us"),
FlowDirection.LeftToRight,
new Typeface("Verdana"), 16, Brushes.OrangeRed),
new System.Windows.Point(10, 120));
}
else
{
timer.Stop();
}