Imagick::sparseColorImage

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Imagick::sparseColorImageInterpolates colors

Descrizione

public Imagick::sparseColorImage ( int $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. Questo metodo è disponibile se Imagick è stato compilato con ImageMagick versione 6.4.5 o successive.

Elenco dei parametri

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. Per default è Imagick::CHANNEL_DEFAULT. Fare riferimento a questa lista di costanti di canale

Valori restituiti

Restituisce TRUE in caso di successo.

Errori/Eccezioni

Lancia una ImagickException in caso di errore.

Esempi

Example #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();
    }

?>

Example #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();
    }

?>

Example #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();
    }

?>

Example #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();
    }

?>

Example #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();
    }

?>

Example #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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User Contributed Notes 1 note

up
3
aehtyb[]gmail.com
3 years ago
For those curious how to use sparseColorImage() directly without the seperate createGradientImage() function.. here is the format of the array used:

Array (
[0]  => 0   // X1 (X coordinate value #1)
[1]  => 0   // Y1 (Y coordinate value #1)
[2]  => 1   // R (red value between 0 and 1)
[3]  => 0   // G (green value between 0 and 1)
[4]  => 0   // B (blue value between 0 and 1)
[5]  => 1   // A (alpha value between 0 and 1)
[6]  => 400 // X2
[7]  => 0   // Y2
[8]  => 0   // R
[9]  => 1   // G
[10] => 0   // B
[11] => 1   // A
[12] => 0   // X3
[13] => 400 // Y3
[14] => 1   // R
[15] => 1   // G
[16] => 0   // B
[17] => 1   // A
[18] => 400 // X4
[19] => 400 // Y4
[20] => 0   // R
[21] => 0   // G
[22] => 1   // B
[23] => 1   // A
)

<?php

$imagick
= new imagick();
$imagick->newImage(400,400,"white");
$imagick->setImageFormat("png");

$array = Array(0,0,1,0,0,1,400,0,0,1,0,1,0,400,1,1,0,1,400,400,0,0,1,1);
$imagick->sparseColorImage(imagick::SPARSECOLORMETHOD_BILINEAR,$array);
   
header("Content-Type: image/png");
echo
$imagick->getImageBlob();

?>
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