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Add stereo option to webform generate. #9

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Add stereo option to webform generate. #9

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32 changes: 19 additions & 13 deletions Waveform.php
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Original file line number Diff line number Diff line change
Expand Up @@ -115,10 +115,11 @@ public function getDuration()
* @param int $width Width of the image file in pixels
* @param int $height Height of the image file in pixels
* @param bool $onePhase `true` to get positive values only, `false` to get both phases
* @param bool $stereo `true` to generate 2 waveforms, `false` to a single waveform
* @return bool Returns `true` on success or `false` on failure.
* @throws \Exception
*/
public function getWaveform($filename, $width, $height, $onePhase = false)
public function getWaveform($filename, $width, $height, $onePhase = false, $stereo = true)
{
// Calculating parameters
$needChannels = $this->getChannels() > 1 ? 2 : 1;
Expand Down Expand Up @@ -149,6 +150,9 @@ public function getWaveform($filename, $width, $height, $onePhase = false)
}

// Drawing channel 1
if (!$stereo) {
$center1 = $height / 2;
}
for ($i = 0; $i < count($lines1); $i += 2) {
$x = $i / 2 / self::$linesPerPixel;
if ($onePhase) {
Expand All @@ -161,21 +165,23 @@ public function getWaveform($filename, $width, $height, $onePhase = false)
}
}
// Drawing channel 2
for ($i = 0; $i < count($lines2); $i += 2) {
$x = $i / 2 / self::$linesPerPixel;
if ($onePhase) {
$max = max($lines2[$i], $lines2[$i + 1]);
imageline($img, $x, $center2, $x, $center2 - $max * $center1, $color);
} else {
$min = $lines2[$i];
$max = $lines2[$i + 1];
imageline($img, $x, $center2 - $min * $center1, $x, $center2 - $max * $center1, $color);
}
}
if ($stereo) {
for ($i = 0; $i < count($lines2); $i += 2) {
$x = $i / 2 / self::$linesPerPixel;
if ($onePhase) {
$max = max($lines2[$i], $lines2[$i + 1]);
imageline($img, $x, $center2, $x, $center2 - $max * $center1, $color);
} else {
$min = $lines2[$i];
$max = $lines2[$i + 1];
imageline($img, $x, $center2 - $min * $center1, $x, $center2 - $max * $center1, $color);
}
}
}

// Axis
imageline($img, 0, $center1, $width - 1, $center1, $axis);
if ($center2 !== null) {
if ($stereo && $center2 !== null) {
imageline($img, 0, $center2, $width - 1, $center2, $axis);
}

Expand Down