ImagickDraw::arc

(PECL imagick 2.0.0)

ImagickDraw::arc — Draws an arc

Description

bool ImagickDraw::arc ( float $sx , float $sy , float $ex , float $ey , float $sd , float $ed )

Warning

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

Draws an arc falling within a specified bounding rectangle on the image.

Parameters

sx: Starting x ordinate of bounding rectangle
sy: starting y ordinate of bounding rectangle
ex: ending x ordinate of bounding rectangle
ey: ending y ordinate of bounding rectangle
sd: starting degrees of rotation
ed: ending degrees of rotation

Return Values

No value is returned.

Коментарии

Jun 24

Автор: skmanji at manji dot org


You can do a pie chart with a combination of arc and polygon functions (there really ought to be a built-in command for this)



<?php

//  create a new canvas object and a white image

$canvas     = new Imagick();

$canvas->newImage(600, 600, 'grey');



image_pie($canvas, 300, 300, 200, 0, 45, 'red');

image_pie($canvas, 300, 300, 200, 45, 125, 'green');

image_pie($canvas, 300, 300, 200, 125, 225, 'blue');

image_pie($canvas, 300, 300, 200, 225, 300, 'cyan');

image_pie($canvas, 300, 300, 200, 300, 360, 'orange');



//  output the image

$canvas->setImageFormat('png');

header("Content-Type: image/png");

echo $canvas;

exit;



// FUNCTIONS



function image_arc( &$canvas, $sx, $sy, $ex, $ey, $sd, $ed, $color = 'black' ) {



    //  draw arc on canvas

    //  $sx, $sy, $ex, $ey specify a bounding rectangle of a circle with the origin in the middle

    //  $sd, and $ed specify start and end angles in degrees



    $draw = new ImagickDraw();

    $draw->setFillColor($color);

    $draw->setStrokeColor($color);

    $draw->setStrokeWidth(1);

    $draw->arc($sx, $sy, $ex, $ey, $sd, $ed);

    $canvas->drawImage($draw);

}



function image_pie( &$canvas, $ox, $oy, $radius, $sd, $ed, $color = 'black' ) {



    //  draw pie segment

    //  $ox, $oy specify the circle origin

    //  $sd, and $ed specify start and end angles in degrees

    //  degrees start from 0 = East, and go clockwise



    //  position 1 - convert degrees to radians and get first point on perimeter of circle

    $x1     = $radius * cos($sd / 180 * 3.1416);

    $y1     = $radius * sin($sd / 180 * 3.1416);



    //  position 2 - convert degrees to radians and get second point on perimeter of circle

    $x2     = $radius * cos($ed / 180 * 3.1416);

    $y2     = $radius * sin($ed / 180 * 3.1416);



    //  draw segment triangle - specify the 3 points and draw a polygon

    $points = array(array('x' => $ox, 'y' => $oy), array('x' => $ox + $x1, 'y' => $oy + $y1), array('x' => $ox + $x2, 'y' => $oy + $y2));



    image_polygon($canvas, $points, $color);



    //  draw corrsesponding arc to complete the "pie" segment

    image_arc($canvas, $ox - $radius, $oy - $radius, $ox + $radius, $oy + $radius, $sd, $ed, $color);

}



function image_polygon( &$canvas, $points, $color = 'black' ) {



    //  draw a polygon on canvas



    $draw = new ImagickDraw();

    $draw->setFillColor($color);

    $draw->setStrokeColor($color);

    $draw->setStrokeWidth(1);

    $draw->polygon($points);

    $canvas->drawImage($draw);

}



?>