26 lines
1.9 KiB
PHP
26 lines
1.9 KiB
PHP
<?php
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// Martin Hozik
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// 24.5.2008
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// doublethink.cleverweb.cz
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class linear_perspective {
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public $cam_location = ['x' => 10, 'y' => 0, 'z' => -240];
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public $cam_rotation = ['x' => -1, 'y' => 0, 'z' => 0];
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public $viewer_position = ['x' => 0, 'y' => -540, 'z' => -65];
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public function get_projection(array $point) {
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$translation = [];
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$projection = [];
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$translation['x'] = cos($this->cam_rotation['y']) * (sin($this->cam_rotation['z']) * ($point['y'] - $this->cam_location['y']) + cos($this->cam_rotation['z']) * ($point['x'] - $this->cam_location['x'])) - sin($this->cam_rotation['y']) * ($point['z'] - $this->cam_location['z']);
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$translation['y'] = sin($this->cam_rotation['x']) * (cos($this->cam_rotation['y']) * ($point['z'] - $this->cam_location['z']) + sin($this->cam_rotation['y']) * (sin($this->cam_rotation['z']) * ($point['y'] - $this->cam_location['y']) + cos($this->cam_rotation['z']) * ($point['x'] - $this->cam_location['x']))) + cos($this->cam_rotation['z']) * (cos($this->cam_rotation['z']) * ($point['y'] - $this->cam_location['y']) - sin($this->cam_rotation['z']) * ($point['x'] - $this->cam_location['x']));
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$translation['z'] = cos($this->cam_rotation['x']) * (cos($this->cam_rotation['y']) * ($point['z'] - $this->cam_location['z']) + sin($this->cam_rotation['y']) * (sin($this->cam_rotation['z']) * ($point['y'] - $this->cam_location['y']) + cos($this->cam_rotation['z']) * ($point['x'] - $this->cam_location['x']))) - sin($this->cam_rotation['z']) * (cos($this->cam_rotation['z']) * ($point['y'] - $this->cam_location['y']) - sin($this->cam_rotation['z']) * ($point['x'] - $this->cam_location['x']));
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$projection['x'] = ($translation['x'] - $this->viewer_position['x']) * ($this->viewer_position['z'] / $translation['z']);
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$projection['y'] = ($translation['y'] - $this->viewer_position['y']) * ($this->viewer_position['z'] / $translation['z']);
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return $projection;
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}
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}
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