File

inc/pchart/pchart/class/pDraw.class.php, line 635

Class

pDraw

Code

function drawBezier($X1, $Y1, $X2, $Y2, $Xv1, $Yv1, $Xv2, $Yv2, $Format = "") 
 {
  $R = isset($Format ["R"]) ? $Format ["R"] : 0;
  $G = isset($Format ["G"]) ? $Format ["G"] : 0;
  $B = isset($Format ["B"]) ? $Format ["B"] : 0;
  $Alpha = isset($Format ["Alpha"]) ? $Format ["Alpha"] : 100;
  $ShowC = isset($Format ["ShowControl"]) ? $Format ["ShowControl"] : FALSE;
  $Segments = isset($Format ["Segments"]) ? $Format ["Segments"] : NULL;
  $Ticks = isset($Format ["Ticks"]) ? $Format ["Ticks"] : NULL;
  $NoDraw = isset($Format ["NoDraw"]) ? $Format ["NoDraw"] : FALSE;
  $PathOnly = isset($Format ["PathOnly"]) ? $Format ["PathOnly"] : FALSE;
  $Weight = isset($Format ["Weight"]) ? $Format ["Weight"] : NULL;
  $DrawArrow = isset($Format ["DrawArrow"]) ? $Format ["DrawArrow"] : FALSE;
  $ArrowSize = isset($Format ["ArrowSize"]) ? $Format ["ArrowSize"] : 10;
  $ArrowRatio = isset($Format ["ArrowRatio"]) ? $Format ["ArrowRatio"] : .5;
  $ArrowTwoHeads = isset($Format ["ArrowTwoHeads"]) ? $Format ["ArrowTwoHeads"] : FALSE;

  if ($Segments == NULL) 
   {
    $Length = $this->getLength($X1, $Y1, $X2, $Y2);
    $Precision = ($Length * 125) / 1000;
  }
  else {
    $Precision = $Segments;
  }

  $P [0]["X"] = $X1;
  $P [0]["Y"] = $Y1;
  $P [1]["X"] = $Xv1;
  $P [1]["Y"] = $Yv1;
  $P [2]["X"] = $Xv2;
  $P [2]["Y"] = $Yv2;
  $P [3]["X"] = $X2;
  $P [3]["Y"] = $Y2;

  /* Compute the bezier points */
  $Q = "";
  $ID = 0;
  $Path = "";
  for ($i = 0; $i <= $Precision; $i = $i + 1) 
   {
    $u = $i / $Precision;

    $C = "";
    $C [0] = (1 - $u) * (1 - $u) * (1 - $u);
    $C [1] = ($u * 3) * (1 - $u) * (1 - $u);
    $C [2] = 3 * $u * $u * (1 - $u);
    $C [3] = $u * $u * $u;

    for ($j = 0; $j <= 3; $j++) 
     {
      if (!isset($Q [$ID])) {
        $Q [$ID] = "";
      }
      if (!isset($Q [$ID]["X"])) {
        $Q [$ID]["X"] = 0;
      }
      if (!isset($Q [$ID]["Y"])) {
        $Q [$ID]["Y"] = 0;
      }

      $Q [$ID]["X"] = $Q [$ID]["X"] + $P [$j]["X"] * $C [$j];
      $Q [$ID]["Y"] = $Q [$ID]["Y"] + $P [$j]["Y"] * $C [$j];
    }
    $ID++;
  }
  $Q [$ID]["X"] = $X2;
  $Q [$ID]["Y"] = $Y2;

  if (!$NoDraw) 
   {
    /* Display the control points */
    if ($ShowC && !$PathOnly) 
     {
      $Xv1 = floor($Xv1);
      $Yv1 = floor($Yv1);
      $Xv2 = floor($Xv2);
      $Yv2 = floor($Yv2);

      $this->drawLine($X1, $Y1, $X2, $Y2, array("R" => 0, "G" => 0, "B" => 0, "Alpha" => 30));

      $MyMarkerSettings = array("R" => 255, "G" => 0, "B" => 0, "BorderR" => 255, "BorderB" => 255, "BorderG" => 255, "Size" => 4);
      $this->drawRectangleMarker($Xv1, $Yv1, $MyMarkerSettings);
      $this->drawText($Xv1 + 4, $Yv1, "v1");
      $MyMarkerSettings = array("R" => 0, "G" => 0, "B" => 255, "BorderR" => 255, "BorderB" => 255, "BorderG" => 255, "Size" => 4);
      $this->drawRectangleMarker($Xv2, $Yv2, $MyMarkerSettings);
      $this->drawText($Xv2 + 4, $Yv2, "v2");
    }

    /* Draw the bezier */
    $LastX = NULL;
    $LastY = NULL;
    $Cpt = NULL;
    $Mode = NULL;
    $ArrowS = NULL;
    foreach ($Q as $Key => $Point) 
     {
      $X = $Point ["X"];
      $Y = $Point ["Y"];

      /* Get the first segment */
      if ($ArrowS == NULL && $LastX != NULL && $LastY != NULL) 
       {
        $ArrowS ["X2"] = $LastX;
        $ArrowS ["Y2"] = $LastY;
        $ArrowS ["X1"] = $X;
        $ArrowS ["Y1"] = $Y;
      }

      if ($LastX != NULL && $LastY != NULL && !$PathOnly) {
        list($Cpt, $Mode) = $this->drawLine($LastX, $LastY, $X, $Y, array("R" => $R, "G" => $G, "B" => $B, "Alpha" => $Alpha, "Ticks" => $Ticks, "Cpt" => $Cpt, "Mode" => $Mode, "Weight" => $Weight));
      }

      /* Get the last segment */
      $ArrowE ["X1"] = $LastX;
      $ArrowE ["Y1"] = $LastY;
      $ArrowE ["X2"] = $X;
      $ArrowE ["Y2"] = $Y;

      $LastX = $X;
      $LastY = $Y;
    }

    if ($DrawArrow && !$PathOnly) 
     {
      $ArrowSettings = array("FillR" => $R, "FillG" => $G, "FillB" => $B, "Alpha" => $Alpha, "Size" => $ArrowSize, "Ratio" => $ArrowRatio);
      if ($ArrowTwoHeads) {
        $this->drawArrow($ArrowS ["X1"], $ArrowS ["Y1"], $ArrowS ["X2"], $ArrowS ["Y2"], $ArrowSettings);
      }

      $this->drawArrow($ArrowE ["X1"], $ArrowE ["Y1"], $ArrowE ["X2"], $ArrowE ["Y2"], $ArrowSettings);
    }
  }
  return ($Q);
}