ScotlandPHP 2016

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. Este método está disponível se o PHP foi compilado com o ImageMagick versão 6.4.5 ou superior.

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

Informa qualquer constante de canal válida no modo do canal. Para mais de um canal, combine as constantes de canal utilizando operações bitwise. O padrão é Imagick::CHANNEL_DEFAULT. Veja nessa lista de constantes de canal

Valor Retornado

Retorna TRUE no sucesso.

Erros

Lança ImagickException em caso de erro.

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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User Contributed Notes 1 note

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1
aehtyb[]gmail.com
3 months 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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