Месец: март 2013

Categories
VB.NET

Решаване на геодезически засечки

Описание:

Това е клас за решаване на геодезически засечки на VB.NET.

Класът включва методи за решаване на права и линейна засечка.

Не е включен метод за решаване на обратна засечка.

Връзки:

Код:

Imports System
Imports System.Math
Public Class PointDetermination
Public Structure Point
Public x, y As Double
End Structure
Public Structure Result
Public x, y As Double
Public m_x, m_y, m_p As Double
End Structure
Private ro As Double = 636.6197
Public Function intersection(ByVal pntA As Point, ByVal pntB As Point, _
ByVal b1 As Double, ByVal b2 As Double, _
ByVal mB As Integer) As Result
Dim angle As Object = New Angle
Dim sap, sbp, c As Double
Dim b3, aap, abp, aab, aba As Double
Dim pntP(2) As Point
Dim res As Result
If pntA.x = pntB.x And pntA.y = pntB.y Then
Throw New Exception(String.Format(My.Resources.equivalentPoints, "A", "B"))
End If
If (b1 + b2) >= 200 Then
Throw New Exception(My.Resources.invalidAngleValue)
End If
If b1 <= 0 Or b2 <= 0 Then
Throw New Exception(My.Resources.invalidAngleValue)
End If
aab = angle.headingAngle(pntB.y - pntA.y, pntB.x - pntA.x)
c = Sqrt(Math.Pow(pntB.y - pntA.y, 2) + Math.Pow(pntB.x - pntA.x, 2))
b3 = 200 - (b1 + b2)
sap = (c * Sin(angle.toRad(b2))) / Sin(angle.toRad(b3))
sbp = (c * Sin(angle.toRad(b1))) / Sin(angle.toRad(b3))
aap = If(aab - b1 < 0, aab - b1 + 400, aab - b1)
aba = If(aab < 200, aab + 200, aab - 200)
abp = If(aba + b2 > 400, aba + b2 - 400, aba + b2)
With pntP(0)
.x = pntA.x + sap * Cos(angle.toRad(aap))
.y = pntA.y + sap * Sin(angle.toRad(aap))
End With
With pntP(1)
.x = pntB.x + sbp * Cos(angle.toRad(abp))
.y = pntB.y + sbp * Sin(angle.toRad(abp))
End With
With res
.x = (pntP(0).x + pntP(1).x) * 0.5
.y = (pntP(0).y + pntP(1).y) * 0.5
.m_x = Nothing
.m_y = Nothing
.m_p = (mB / (ro * Sin(angle.toRad(b3)))) * Sqrt(Math.Pow(sap, 2) + Math.Pow(sbp, 2))
End With
Return res
End Function
Public Function arcSection(ByVal pntA As Point, ByVal pntB As Point, _
ByVal sap As Double, ByVal sbp As Double, _
ByVal a As Double, ByVal b As Double) As Result
Dim angle As Object = New Angle
Dim b1, b2, b3 As Double
Dim aap, abp, aab, aba As Double
Dim dx, dy, s, c As Double
Dim m_s As Double
Dim pntP(2) As Point
Dim res As Result
If pntA.x = pntB.x And pntA.y = pntB.y Then
Throw New Exception(String.Format(My.Resources.equivalentPoints, "A", "B"))
End If
If sap <= 0 Or sbp <= 0 Then
Throw New Exception(My.Resources.negativeOrZeroLengthSide)
End If
If (Sqrt(Math.Pow(pntA.x - pntB.x, 2) + Math.Pow(pntA.y - pntB.y, 2))) >= (sap + sbp) Then
Throw New Exception(My.Resources.notAVerticesOfATriangle)
End If
If (Sqrt(Math.Pow(pntA.x - pntB.x, 2) + Math.Pow(pntA.y - pntB.y, 2)) + sap) <= sbp Then
Throw New Exception(My.Resources.notAVerticesOfATriangle)
End If
If (Sqrt(Math.Pow(pntA.x - pntB.x, 2) + Math.Pow(pntA.y - pntB.y, 2)) + sbp) <= sap Then
Throw New Exception(My.Resources.notAVerticesOfATriangle)
End If
dy = pntB.y - pntA.y
dx = pntB.x - pntA.x
aab = angle.headingAngle(dy, dx)
c = Sqrt(Math.Pow(dy, 2) + Math.Pow(dx, 2))
s = 0.5 * (sap + sbp + c)
b1 = 2 * angle.toGrad(Atan(Sqrt(((s - sap) * (s - c)) / (s * (s - sbp)))))
b2 = 2 * angle.toGrad(Atan(Sqrt(((s - sbp) * (s - c)) / (s * (s - sap)))))
b3 = 2 * angle.toGrad(Atan(Sqrt(((s - sap) * (s - sbp)) / (s * (s - c)))))
aap = If(aab - b1 < 0, aab - b1 + 400, aab - b1)
aba = If(aab < 200, aab + 200, aab - 200)
abp = If(aba + b2 > 400, aba + b2 - 400, aba + b2)
With pntP(0)
.x = pntA.x + sap * Cos(angle.toRad(aap))
.y = pntA.y + sap * Sin(angle.toRad(aap))
End With
With pntP(1)
.x = pntB.x + sbp * Cos(angle.toRad(abp))
.y = pntB.y + sbp * Sin(angle.toRad(abp))
End With
m_s = a + b * (((sap + sbp) * 0.001) * 0.5)
With res
.x = (pntP(0).x + pntP(1).x) * 0.5
.y = (pntP(0).y + pntP(1).y) * 0.5
.m_x = (m_s / Sin(angle.toRad(b3))) * Sqrt(Math.Pow(Sin(angle.toRad(aap)), 2) + Math.Pow(Sin(angle.toRad(abp)), 2))
.m_y = (m_s / Sin(angle.toRad(b3))) * Sqrt(Math.Pow(Cos(angle.toRad(aap)), 2) + Math.Pow(Cos(angle.toRad(abp)), 2))
.m_p = (m_s / Sin(angle.toRad(b3))) * Sqrt(2)
End With
Return res
End Function
End Class
view raw PointDetermination.vb hosted with ❤ by GitHub
Categories
PHP

Сваляне на видео от Vbox7

Описание:

PHP клас за сваляне на видео файлове от Vbox7.com

Код:

<?php
/**
* PHP клас за сваляне на видео файлове от vbox7
* @author GNNMobile.eu
*/
class VboxDownload
{
private $maxMediaServers = 30;
public function getUrl($videoID)
{
$return = array(
'success' => false,
'url' => null,
'errors' => null
);
if (!preg_match('/^[a-z0-9]+$/u', $videoID)) {
$return['errors'][] = 'Невалидно video-id';
}
if ($return['errors'] == null) {
for ($id = 1; $id < $this->maxMediaServers; $id++) {
$mediaServer = str_pad($id, 2, "0", STR_PAD_LEFT);
$dir = substr($videoID, 0, 2);
$url = sprintf("http://media%s.vbox7.com/s/%s/%s.flv", $mediaServer, $dir, $videoID);
if ($this->remoteFileExists($url) === true) {
$return['success'] = true;
$return['url'] = $url;
break;
}
}
if ($return['success'] === false) {
$return['errors'][] = 'Няма намерен файл';
}
}
return $return;
}
private function remoteFileExists($url)
{
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 0.1);
if (curl_exec($ch)) {
$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($statusCode == 200) {
return true;
}
}
curl_close($ch);
return false;
}
}
view raw VboxDownload.php hosted with ❤ by GitHub

Други:

Работещ клас на PHP за сваляне на видео от VBOX7