ImagickDraw::arc

(PECL imagick 2, PECL imagick 3)

ImagickDraw::arc — Draws an arc

说明

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

Warning

本函数还未编写文档，仅有参数列表。

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

参数

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

返回值

没有返回值。

范例

Example #1 ImagickDraw::arc() example


<?php
function arc($strokeColor, $fillColor, $backgroundColor, $startX, $startY, $endX, $endY, $startAngle, $endAngle) {

    //Create a ImagickDraw object to draw into.
    $draw = new \ImagickDraw();
    $draw->setStrokeWidth(1);
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(2);

    $draw->arc($startX, $startY, $endX, $endY, $startAngle, $endAngle);

    //Create an image object which the draw commands can be rendered into
    $image = new \Imagick();
    $image->newImage(IMAGE_WIDTH, IMAGE_HEIGHT, $backgroundColor);
    $image->setImageFormat("png");

    //Render the draw commands in the ImagickDraw object 
    //into the image.
    $image->drawImage($draw);

    //Send the image to the browser
    header("Content-Type: image/png");
    echo $image->getImageBlob();
}

?>

User Contributed Notes

skmanji at manji dot org 24-Jun-2011 06:30


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);


}





?>