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imageline

(PHP 3, PHP 4, PHP 5)

imageline -- Draw a line

Описание

bool imageline ( resource image, int x1, int y1, int x2, int y2, int color )

imageline() draws a line between the two given points.

Список параметров

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
x1: x-coordinate for first point
y1: y-coordinate for first point
x2: x-coordinate for second point
y2: y-coordinate for second point
color: The line color. A color identifier created with imagecolorallocate()

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Примеры

Пример 1. Drawing a thick line

<?php function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1) { /* this way it works well only for orthogonal lines imagesetthickness($image, $thick); return imageline($image, $x1, $y1, $x2, $y2, $color); */ if ($thick == 1) { return imageline($image, $x1, $y1, $x2, $y2, $color); } $t = $thick / 2 - 0.5; if ($x1 == $x2 || $y1 == $y2) { return imagefilledrectangle($image, round(min($x1, $x2) - $t), round(min($y1, $y2) - $t), round(max($x1, $x2) + $t), round(max($y1, $y2) + $t), $color); } $k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q $a = $t / sqrt(1 + pow($k, 2)); $points = array( round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a), round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a), round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a), round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a), ); imagefilledpolygon($image, $points, 4, $color); return imagepolygon($image, $points, 4, $color); } ?>

Смотрите также

imagecreatetruecolor()

imagecolorallocate()

imageloadfont

imagelayereffect

Last updated: Sat, 27 Jan 2007

add a note User Contributed Notes
imageline

admin at xpmail dot net
30-Apr-2007 05:45


example of a Simple grid...

bool imagegrid ( resource $image, int $width, int $Height, int $size, mixed $color )



<?php

Header("Content-type: image/png");

$Width=450;

$Height=450;



$img = ImageCreateTrueColor($Width, $Height);



$bg = imagecolorallocate($img, 255, 255, 255);

imagefill($img, 0, 0, $bg);



$grid = imagecolorallocate($img, 225, 245, 249);



imagesetstyle($img, array($bg, $grid));

imagegrid($img, $Width, $Height, 10, IMG_COLOR_STYLED);

//makegrid($img, $Width, $Height, 10, $grid);



ImagePNG($img);

ImageDestroy($img);



function imagegrid($image, $w, $h, $s, $color)

{

    for($iw=1; $iw<$w/$s; $iw++){imageline($image, $iw*$s, 0, $iw*$s, $w, $color);}

    for($ih=1; $ih<$h/$s; $ih++){imageline($image, 0, $ih*$s, $w, $ih*$s, $color);}

}

?>

Jonathan W.
27-Apr-2007 01:15


I've modified the previous entry for drawing on a polar coordinate system to better represent angles based on a 360

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11 июля 2007
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