Imagick::sparseColorImage

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Imagick::sparseColorImageInterpolates colors

Descrição

public bool Imagick::sparseColorImage ( int $SPARSE_METHOD , array $arguments [, int $channel = Imagick::CHANNEL_DEFAULT ] )

Given the arguments array containing numeric values this method interpolates the colors found at those coordinates across the whole image using sparse_method. This method is available if Imagick has been compiled against ImageMagick version 6.4.5 or newer.

Parâmetros

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. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants

Valor Retornado

Returns TRUE on success.

Erros

Throws ImagickException on error.

Exemplos

Exemplo #1 SPARSECOLORMETHOD_BARYCENTRIC Imagick::sparseColorImage()

<?php
    
function renderImageBarycentric2() {
        
$points = [
            [
0.300.10'red'],
            [
0.100.80'blue'],
            [
0.700.60'lime'],
            [
0.800.20'yellow'],
        ];
        
$imagick createGradientImage(
            
400400,
            
$points,
            \
Imagick::SPARSECOLORMETHOD_BARYCENTRIC
        
);
        
header("Content-Type: image/png");
        echo 
$imagick->getImageBlob();
    }

?>

Exemplo #2 SPARSECOLORMETHOD_BILINEAR Imagick::sparseColorImage()

<?php
    
function renderImageBilinear() {
        
$points = [[0.300.10'red'], [0.100.80'blue'], [0.700.60'lime'], [0.800.20'yellow'],];
        
$imagick createGradientImage(500500$points, \Imagick::SPARSECOLORMETHOD_BILINEAR);
        
header("Content-Type: image/png");
        echo 
$imagick->getImageBlob();
    }

?>

Exemplo #3 SPARSECOLORMETHOD_SPEPARDS Imagick::sparseColorImage()

<?php
    
function renderImageShepards() {
        
$points = [
            [
0.300.10'red'],
            [
0.100.80'blue'],
            [
0.700.60'lime'],
            [
0.800.20'yellow'],
        ];
        
$imagick createGradientImage(600600$points, \Imagick::SPARSECOLORMETHOD_SPEPARDS);
        
header("Content-Type: image/png");
        echo 
$imagick->getImageBlob();
    }

?>

Exemplo #4 SPARSECOLORMETHOD_VORONOI Imagick::sparseColorImage()

<?php
    
function renderImageVoronoi() {
        
$points = [
            [
0.300.10'red'],
            [
0.100.80'blue'],
            [
0.700.60'lime'],
            [
0.800.20'yellow'],
        ];
        
$imagick createGradientImage(500500$points, \Imagick::SPARSECOLORMETHOD_VORONOI);
        
header("Content-Type: image/png");
        echo 
$imagick->getImageBlob();
    }

?>

Exemplo #5 SPARSECOLORMETHOD_BARYCENTRIC Imagick::sparseColorImage()

<?php
    
function renderImageBarycentric() {
        
$points = [
            [
00'skyblue'],
            [-
11'skyblue'],
            [
11'black'],
        ];
        
$imagick createGradientImage(600200$points, \Imagick::SPARSECOLORMETHOD_BARYCENTRIC);
        
header("Content-Type: image/png");
        echo 
$imagick->getImageBlob();
    }

?>

Exemplo #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;
}

?>

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