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(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::sparseColorImage — Interpolates colors
$SPARSE_METHOD, array $arguments, int $channel = Imagick::CHANNEL_DEFAULT): bool
Given the arguments array containing numeric values this method interpolates
the colors found at those coordinates across the whole image using sparse_method.
此方法在Imagick基于ImageMagick 6.4.5以上版本编译时可用。
SPARSE_METHOD
Refer to this list of sparse method constants
arguments
An array containing the coordinates.
The array is in format array(1,1, 2,45)
channel
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. 缺省为Imagick::CHANNEL_DEFAULT.
参考此 通道常数列表
成功时返回 true。
错误时抛出 ImagickException。
示例 #1 SPARSECOLORMETHOD_BARYCENTRIC Imagick::sparseColorImage()
<?php
function renderImageBarycentric2() {
$points = [
[0.30, 0.10, 'red'],
[0.10, 0.80, 'blue'],
[0.70, 0.60, 'lime'],
[0.80, 0.20, 'yellow'],
];
$imagick = createGradientImage(
400, 400,
$points,
\Imagick::SPARSECOLORMETHOD_BARYCENTRIC
);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>
示例 #2 SPARSECOLORMETHOD_BILINEAR Imagick::sparseColorImage()
<?php
function renderImageBilinear() {
$points = [[0.30, 0.10, 'red'], [0.10, 0.80, 'blue'], [0.70, 0.60, 'lime'], [0.80, 0.20, 'yellow'],];
$imagick = createGradientImage(500, 500, $points, \Imagick::SPARSECOLORMETHOD_BILINEAR);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>
示例 #3 SPARSECOLORMETHOD_SPEPARDS Imagick::sparseColorImage()
<?php
function renderImageShepards() {
$points = [
[0.30, 0.10, 'red'],
[0.10, 0.80, 'blue'],
[0.70, 0.60, 'lime'],
[0.80, 0.20, 'yellow'],
];
$imagick = createGradientImage(600, 600, $points, \Imagick::SPARSECOLORMETHOD_SPEPARDS);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>
示例 #4 SPARSECOLORMETHOD_VORONOI Imagick::sparseColorImage()
<?php
function renderImageVoronoi() {
$points = [
[0.30, 0.10, 'red'],
[0.10, 0.80, 'blue'],
[0.70, 0.60, 'lime'],
[0.80, 0.20, 'yellow'],
];
$imagick = createGradientImage(500, 500, $points, \Imagick::SPARSECOLORMETHOD_VORONOI);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>
示例 #5 SPARSECOLORMETHOD_BARYCENTRIC Imagick::sparseColorImage()
<?php
function renderImageBarycentric() {
$points = [
[0, 0, 'skyblue'],
[-1, 1, 'skyblue'],
[1, 1, 'black'],
];
$imagick = createGradientImage(600, 200, $points, \Imagick::SPARSECOLORMETHOD_BARYCENTRIC);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>
示例 #6 createGradientImage is used by other examples. Imagick::sparseColorImage()
<?php
function createGradientImage($width, $height, $colorPoints, $sparseMethod, $absolute = false) {
$imagick = new \Imagick();
$imagick->newImage($width, $height, "white");
$imagick->setImageFormat("png");
$barycentricPoints = array();
foreach ($colorPoints as $colorPoint) {
if ($absolute == true) {
$barycentricPoints[] = $colorPoint[0];
$barycentricPoints[] = $colorPoint[1];
}
else {
$barycentricPoints[] = $colorPoint[0] * $width;
$barycentricPoints[] = $colorPoint[1] * $height;
}
if (is_string($colorPoint[2])) {
$imagickPixel = new \ImagickPixel($colorPoint[2]);
}
else if ($colorPoint[2] instanceof \ImagickPixel) {
$imagickPixel = $colorPoint[2];
}
else{
$errorMessage = sprintf(
"Value %s is neither a string nor an ImagickPixel class. Cannot use as a color.",
$colorPoint[2]
);
throw new \InvalidArgumentException(
$errorMessage
);
}
$red = $imagickPixel->getColorValue(\Imagick::COLOR_RED);
$green = $imagickPixel->getColorValue(\Imagick::COLOR_GREEN);
$blue = $imagickPixel->getColorValue(\Imagick::COLOR_BLUE);
$alpha = $imagickPixel->getColorValue(\Imagick::COLOR_ALPHA);
$barycentricPoints[] = $red;
$barycentricPoints[] = $green;
$barycentricPoints[] = $blue;
$barycentricPoints[] = $alpha;
}
$imagick->sparseColorImage($sparseMethod, $barycentricPoints);
return $imagick;
}
?>
