imagesetthickness

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

imagesetthickness — 设定画线的宽度

说明

bool imagesetthickness ( resource $image , int $thickness )

imagesetthickness() 把画矩形，多边形，椭圆等等时所用的线宽设为 thickness 个像素。成功时返回 TRUE ，或者在失败时返回 FALSE 。

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

参数

image: 由图象创建函数(例如 imagecreatetruecolor() )返回的图象资源。
thickness: Thickness, in pixels.

返回值

成功时返回 TRUE ，或者在失败时返回 FALSE 。

范例

Example #1 imagesetthickness() example

  <?php
 // Create a 200x100 image
 $im  =  imagecreatetruecolor ( 200 ,  100 );
 $white  =  imagecolorallocate ( $im ,  0xFF ,  0xFF ,  0xFF );
 $black  =  imagecolorallocate ( $im ,  0x00 ,  0x00 ,  0x00 );

 // Set the background to be white
 imagefilledrectangle ( $im ,  0 ,  0 ,  299 ,  99 ,  $white );

 // Set the line thickness to 5
 imagesetthickness ( $im ,  5 );

 // Draw the rectangle
 imagerectangle ( $im ,  14 ,  14 ,  185 ,  85 ,  $black );

 // Output image to the browser
 header ( 'Content-Type: image/png' );

 imagepng ( $im );
 imagedestroy ( $im );
 ?>

以上例程的输出类似于：

注释

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

用户评论:

[#1] azinkey at gmail dot com [2013-07-30 10:51:49]

thanks circle14,

just change the line & see its solved what we need for ellipse

while ($line < $thickness) {
        $line++;
        $elipse_w--;
        imageellipse($image, $pos_x, $pos_y, $elipse_w, $elipse_h, $color);
        $elipse_h--;
    }

[#2] fred at nowhere dot fr [2009-10-10 12:05:08]

One thing worse to mention is that imagesetthikness() works on the next object you draw.
For ex : you can draw a grid within a grapg with a thickness of 1

by invoking imagesetthickness($image, 1);

... script to draw your grid...

and then invoke imagesetthikness with a draw your graph lines with a thickness of 3
imagesetthickness($image, 3);
... script to draw your graph lines...

Hope this helps...

[#3] raffi dot semerciyan at gmail dot com [2009-09-24 08:42:09]

While recently "playing" with GD library for PHP I also encountered the problem of imagesetthickness not working with imageellipse.

I think I found a good work around and wanted to share it with you:

Instead of using

<?php imageellipse($image, $pos_x, $pos_y, $elipse_w, $elipse_h, $color); ?>

I successfully used:

<?php imagearc($image, $pos_x, $pos_y, $elipse_w, $elipse_h, 0, 359.9, $color); ?>

NOTE: Don't put exactly 360 instead of 359.9 because it seems that the implementation makes the test and uses imageellipse instead!
Below is my Ellipse function that is sensitive to imagesetthickness function AND that creates a properly closed ellipse.

<?php function myimageellipse($image, $x, $y, $rx, $ry, $color) { // We don't use imageellipse because the imagesetthickness function has // no effect. So the better workaround is to use imagearc. imagearc($image,$x,$y,$rx,$ry, 0,359,$color); // If we stop here, we don't have a properly closed ellipse. // Using imagefill at this point will flood outside the ellipse (actually arc). // We have to close the arc to make it a real ellipse. $cos359=0.99984769; $sin359=-0.01745240; $x1=round($x+$rx/2*$cos359); $y1=round($y+$ry/2*$sin359); $x2=round($x+$rx/2); $y2=round($y); // imageline is sensitive to imagesetthickness as well. imageline($image,$x1,$y1,$x2,$y2,$color); } ?>

[#4] jean-raymond dot chauviere at gmail dot com [2009-06-30 01:20:20]

An easier to manage thickness is, before to draw in the ellipse to play with 2 ellipse with different color :

<?php imagefilledellipse ($this->image,60,42,57,57,$drawColor); imagefilledellipse ($this->image,60,42,45,45,$backColor); ?>

The first line draw a filled ellipse with the wanted color, and the 2nd one, draw an ellipse with the background color from the same center, but is smaller.

The drawback of this method is that you erase everything in the middle of the ellipse.

[#5] admin at circle14 dot net [2009-02-01 17:33:29]

Here is a custom function I wrote that addresses the line thickness issues with ellipses :

<?php function draw_oval ($image, $pos_x, $pos_y, $elipse_width, $elipse_height, $color, $px_thick) { $line = 0; $thickness = $px_thick; $elipse_w = $elipse_width; $elipse_h = $elipse_height; while ($line < $thickness) { imageellipse($image, $pos_x, $pos_y, $elipse_w, $elipse_h, $color); $line++; $elipse_w--; $elipse_h--; } } ?>

I hope you find this useful.

[#6] bpatru at gmail dot com [2008-09-28 13:01:34]

Apparently imagesetthickness doesn't work if antialiasing is set to true.

[#7] baldurien at bbnwn dot eu [2008-03-11 16:28:52]

The way that imagesetthickness works with imagerectangle() is pretty strange.

<?php imagesetthickness(1); imagerectangle($im, 10, 10, 50, 50, $red); ?>

This will draw a 41x41 square (because gd need the bottom right pixel, inclusive. 50 should get replaced by 49). This will "work" like:

<?php imageline($im, 10, 10, 10, 50, $red); imageline($im, 10, 10, 50, 10, $red); imageline($im, 50, 10, 50, 50, $red); imageline($im, 10, 50, 50, 50, $red); ?>

The second example:

<?php imagesetthickness(2); imagerectangle($im, 10, 10, 50, 50, $red); ?>

This will draw a 43x43 square because the border (thickness) is set to 2. *however* this is not a "regular" border of 2 pixels around the 41x41 original square!

On the left and right, there will be a thickness of 3, while there we be a thickness of 2.

If you take the imageline example, but set the thickness before to 2, this will *almost* do the trick: the left most pixel of the square will not be drawn.

To conclude:

1) do not forget that (width, height) of drawn rectangle is (x2-x1+1, y2-y1+1)
2) thickness is bad implemented (or at least, the behavior i s not documented) on rectangle, as the left/right thickness is not the wanted one.
3) 4*imageline() should do the trick, but after "patching" the top left pixel.

[#8] ab at cd dot com [2007-06-27 04:05:02]

Note: Also, for me (working under PHP 5.0.2) this function ONLY seems to work with imageline...

[#9] -private- [2007-03-28 01:01:28]

There is a known bug. Imagesetthickness is NOT working on ellipse.