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This document uses PHP Chinese website manual Release
(PECL imagick 2.0.0)
ImagickDraw::arc — Draws an arc
$sx
, float $sy
, float $ex
, float $ey
, float $sd
, float $ed
)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.
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
没有返回值。
Example #1 ImagickDraw::arc()
<?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 ();
}
?>
[#1] skmanji at manji dot org [2011-06-24 06:30:06]
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);
}
?>