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<?php |
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/** |
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* JPGraph v4.0.3 |
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*/ |
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namespace Amenadiel\JpGraph\Graph; |
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/** |
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* @class RectPattern3DPlane |
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* // Implements "3D" plane pattern |
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*/ |
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class RectPattern3DPlane extends RectPattern |
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{ |
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private $alpha = 50; // Parameter that specifies the distance |
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// to "simulated" horizon in pixel from the |
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// top of the band. Specifies how fast the lines |
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// converge. |
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public function __construct($aColor = 'black', $aWeight = 1) |
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{ |
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parent::__construct($aColor, $aWeight); |
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$this->SetDensity(10); // Slightly larger default |
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} |
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public function SetHorizon($aHorizon) |
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{ |
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$this->alpha = $aHorizon; |
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} |
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public function DoPattern($aImg) |
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{ |
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// "Fake" a nice 3D grid-effect. |
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$x0 = $this->rect->x + $this->rect->w / 2; |
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$y0 = $this->rect->y; |
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$x1 = $x0; |
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$y1 = $this->rect->ye; |
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$x0_right = $x0; |
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$x1_right = $x1; |
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// BTW "apa" means monkey in Swedish but is really a shortform for |
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// "alpha+a" which was the labels I used on paper when I derived the |
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// geometric to get the 3D perspective right. |
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// $apa is the height of the bounding rectangle plus the distance to the |
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// artifical horizon (alpha) |
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$apa = $this->rect->h + $this->alpha; |
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// Three cases and three loops |
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// 1) The endpoint of the line ends on the bottom line |
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// 2) The endpoint ends on the side |
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// 3) Horizontal lines |
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// Endpoint falls on bottom line |
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$middle = $this->rect->x + $this->rect->w / 2; |
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$dist = $this->linespacing; |
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$factor = $this->alpha / ($apa); |
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while ($x1 > $this->rect->x) { |
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$aImg->Line($x0, $y0, $x1, $y1); |
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$aImg->Line($x0_right, $y0, $x1_right, $y1); |
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$x1 = $middle - $dist; |
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$x0 = $middle - $dist * $factor; |
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$x1_right = $middle + $dist; |
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$x0_right = $middle + $dist * $factor; |
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$dist += $this->linespacing; |
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} |
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// Endpoint falls on sides |
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$dist -= $this->linespacing; |
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$d = $this->rect->w / 2; |
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$c = $apa - $d * $apa / $dist; |
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while ($x0 > $this->rect->x) { |
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$aImg->Line($x0, $y0, $this->rect->x, $this->rect->ye - $c); |
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$aImg->Line($x0_right, $y0, $this->rect->xe, $this->rect->ye - $c); |
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$dist += $this->linespacing; |
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$x0 = $middle - $dist * $factor; |
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$x1 = $middle - $dist; |
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$x0_right = $middle + $dist * $factor; |
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$c = $apa - $d * $apa / $dist; |
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} |
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// Horizontal lines |
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// They need some serious consideration since they are a function |
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// of perspective depth (alpha) and density (linespacing) |
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$x0 = $this->rect->x; |
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$x1 = $this->rect->xe; |
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$y = $this->rect->ye; |
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// The first line is drawn directly. Makes the loop below slightly |
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// more readable. |
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$aImg->Line($x0, $y, $x1, $y); |
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$hls = $this->linespacing; |
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// A correction factor for vertical "brick" line spacing to account for |
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// a) the difference in number of pixels hor vs vert |
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// b) visual apperance to make the first layer of "bricks" look more |
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// square. |
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$vls = $this->linespacing * 0.6; |
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$ds = $hls * ($apa - $vls) / $apa; |
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// Get the slope for the "perspective line" going from bottom right |
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// corner to top left corner of the "first" brick. |
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// Uncomment the following lines if you want to get a visual understanding |
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// of what this helpline does. BTW this mimics the way you would get the |
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// perspective right when drawing on paper. |
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/* |
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$x0 = $middle; |
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$y0 = $this->rect->ye; |
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$len=floor(($this->rect->ye-$this->rect->y)/$vls); |
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$x1 = $middle+round($len*$ds); |
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$y1 = $this->rect->ye-$len*$vls; |
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$aImg->PushColor("red"); |
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$aImg->Line($x0,$y0,$x1,$y1); |
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$aImg->PopColor(); |
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*/ |
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$y -= $vls; |
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$k = ($this->rect->ye - ($this->rect->ye - $vls)) / ($middle - ($middle - $ds)); |
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$dist = $hls; |
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while ($y > $this->rect->y) { |
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$aImg->Line($this->rect->x, $y, $this->rect->xe, $y); |
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$adj = $k * $dist / (1 + $dist * $k / $apa); |
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if ($adj < 2) { |
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$adj = 1; |
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} |
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$y = $this->rect->ye - round($adj); |
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$dist += $hls; |
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} |
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} |
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} |
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HuasoFoundries /
jpgraph
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