ImagickDraw::bezier()

(PECL imagick 2.0.0)

Draws a bezier curve

说明

ImagickDraw::bezier(array $coordinates): bool

Warning

本函数还未编写文档，仅有参数列表。

Draws a bezier curve through a set of points on the image.

参数

$coordinates

Multidimensional array like array(array('x'=> 1,'y'=> 2), array('x'=> 3,'y'=> 4))

返回值

没有返回值。

范例

Example #1 ImagickDraw::bezier()

<?php
function bezier($strokeColor, $fillColor, $backgroundColor) {
    $draw = new \ImagickDraw();
    $strokeColor = new \ImagickPixel($strokeColor);
    $fillColor = new \ImagickPixel($fillColor);
    $draw->setStrokeOpacity(1);
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(2);
    $smoothPointsSet = [
        [
            ['x' => 10.0 * 5, 'y' => 10.0 * 5],
            ['x' => 30.0 * 5, 'y' => 90.0 * 5],
            ['x' => 25.0 * 5, 'y' => 10.0 * 5],
            ['x' => 50.0 * 5, 'y' => 50.0 * 5],
        ], 
        [
            ['x' => 50.0 * 5, 'y' => 50.0 * 5],
            ['x' => 75.0 * 5, 'y' => 90.0 * 5],
            ['x' => 70.0 * 5, 'y' => 10.0 * 5],
            ['x' => 90.0 * 5, 'y' => 40.0 * 5],
        ],
    ];
    foreach ($smoothPointsSet as $points) {
        $draw->bezier($points);
    }
    $disjointPoints = [
        [
            ['x' => 10 * 5, 'y' => 10 * 5], 
            ['x' => 30 * 5, 'y' => 90 * 5], 
            ['x' => 25 * 5, 'y' => 10 * 5],
            ['x' => 50 * 5, 'y' => 50 * 5],
        ],
        [
            ['x' => 50 * 5, 'y' => 50 * 5], 
            ['x' => 80 * 5, 'y' => 50 * 5],
            ['x' => 70 * 5, 'y' => 10 * 5],
            ['x' => 90 * 5, 'y' => 40 * 5],
         ]
    ];
    $draw->translate(0, 200);
    foreach ($disjointPoints as $points) {
        $draw->bezier($points);
    }
    //Create an image object which the draw commands can be rendered into
    $imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    //Render the draw commands in the ImagickDraw object 
    //into the image.
    $imagick->drawImage($draw);
    //Send the image to the browser
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}
?>

This function requires at least 3 points. The following code fails when there are only two points left in the array:
<?php
$im = new Imagick ();
$points = array (array ('x' => 10, 'y' => 10), array ('x' => 20, 'y' => 10), array ('x' => 30, 'y' => 40), array ('x' => 40, 'y' => 20), array ('x' => 50, 'y' => 60));
$n = 0;
while (!empty ($points))
{
  $im->newImage (64, 64, "white");
  $draw = new ImagickDraw ();
  $draw->setFillColor ("none");
  $draw->setStrokeWidth (4);
  $draw->setStrokeColor ("black");
  $draw->setStrokeOpacity (0.9);
  $draw->setStrokeAntiAlias (true);
  $draw->bezier ($points);
  $im->drawImage ($draw);
  $im->writeImage ("IMG_$n.png");
  $draw->destroy ();
  $im->destroy ();
  echo count ($points) . ", $n: <img src=\"IMG_$n.png\"><br>";
  $n++;
  array_shift ($points);
}
?>

How to use:
<?php
  $width = 200;
  $height = 200;
  $border = 2;
  
  $img = new Imagick();
  $img->newImage( $width, $height, new ImagickPixel( 'transparent' ) );
  
  $draw = new ImagickDraw();
  $draw->setStrokeColor( new ImagickPixel( 'black' ) );
  $draw->setStrokeWidth( 2 );
  $draw->setFillColor( new ImagickPixel( 'transparent' ) );
  // will fail in an obscure manner if the input data is invalid
  $points = array
  ( 
    array( 'x' => 0, 'y' => 200 ), 
    array( 'x' => 0, 'y' => 0 ), 
    array( 'x' => 200, 'y' => 200 ), 
    array( 'x' => 200, 'y' => 0 )
  );
  
  $draw->bezier($points);
      
  $img->drawImage( $draw );
  $img->setImageFormat( "png" );
  
  header( "Content-Type: image/png" );
  echo $img;
?>