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    ImagickDraw::arc

    (PECL imagick 2, PECL imagick 3)

    ImagickDraw::arc — 円弧を描画する

    説明

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

    この関数は、 現在のところ詳細な情報はありません。引数のリストのみが 記述されています。

    画像上の指定した矩形内に円弧を描画します。

    パラメータ

    sx

    矩形の開始位置の x 座標。

    sy

    矩形の開始位置の y 座標。

    ex

    矩形の終了位置の x 座標。

    ey

    矩形の終了位置の y 座標。

    sd

    開始位置の角度。

    ed

    終了位置の角度。

    戻り値

    値を返しません。

    例

    例1 ImagickDraw::arc() の例

    <?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();
    }

    ?>

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    User Contributed Notes 1 note

    up
    1
    skmanji at manji dot org
    13 years ago
    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);
    }

    ?>
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