ImagickDraw::line

(PECL imagick 2.0.0)

ImagickDraw::line — Draws a line

Description

bool ImagickDraw::line ( float $sx , float $sy , float $ex , float $ey )

Warning

This function is currently not documented; only its argument list is available.

Draws a line on the image using the current stroke color, stroke opacity, and stroke width.

Parameters

sx: starting x coordinate
sy: starting y coordinate
ex: ending x coordinate
ey: ending y coordinate

Return Values

No value is returned.

add a note User Contributed Notes ImagickDraw::line

GaryM at BinaryFarm dot com 24-Feb-2010 11:48


<?php



// a twist on the above radar screen. 

// This makes random colored spokes from a center point



    $width =  400;

    $height = 400;

   

    $image = new Imagick();

    $image->newImage( $width, $height, new ImagickPixel( 'wheat' ) );

    $draw = new ImagickDraw();

   //$draw->setStrokeColor( new ImagickPixel( 'black' ) );



    $rx = $width / 2;

    $ry = $height / 2;

    $total = 2*M_PI;

    $part = $total / 16;

    while( $total > 0  )

    {

        $ex = $rx +$rx * sin( $total );

        $ey = $ry +$ry * cos( $total );

        $draw->line  ( $rx, $ry, $ex, $ey );

        $total -= $part;



    // We need three HEX numbers to create an RGB color code like '#FF33DD'.



    $draw->setStrokeColor( get_random_color() );

    }

    $image->drawImage( $draw );

    $image->setImageFormat( "png" );

    header( "Content-Type: image/png" );

    echo $image;

    exit;



function get_random_color()        // Thanks to Greg R. for this nice little function.

{

    for ($i = 0; $i<6; $i++)

    {

        $c .=  dechex(rand(0,15));

    }

    return "#$c";

} 

?>

Axeia 31-Mar-2009 02:53


A small example on how to draw lines and output it as a PNG as the documentation is quite poor at the moment.



This example draws a bunch of lines towards the center of the image, useful if you want to make a spiderweb, or radar-chart.. or something along those lines.

<?php

    $width =  200;

    $height = 200;

    $border = 2;

    

    $img = new Imagick();

    $img->newImage( $width, $height, new ImagickPixel( 'lime' ) );

    $draw = new ImagickDraw();

    $draw->setStrokeColor( new ImagickPixel( 'black' ) );



    $rx = $width / 2; 

    $ry = $height / 2;

    $total = 2*M_PI;

    $part = $total / 12;

    while( $total > 0  )

    {

        $ex = $rx +$rx * sin( $total );

        $ey = $ry +$ry * cos( $total ); 

        $draw->line  ( $rx, $ry, $ex, $ey );

        $total -= $part;

    }

    $img->drawImage( $draw );

    $img->setImageFormat( "png" );

    header( "Content-Type: image/png" );

    echo $img;

?>

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