sin()线的代码

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jnkq:
sin()线的代码 <?php
$width = 400;
$height = 300;

$data = array();
for( $i = 0; $i < 500; $i++ )
{
$data []= sin( deg2rad( ( $i / 500 ) * 360 ) );
}

$xstart = $width/10;
$ystart = $height - ($height/10);

$image = imagecreate($width, $height);
$back = imagecolorallocate($image, 255, 255, 255);
$border = imagecolorallocate($image, 64, 64, 64);

imageline( $image, $xstart, 0, $xstart, $ystart, $border );
imageline( $image, $xstart, $ystart, $width, $ystart, $border );

imagestring( $image, 2, $xstart-20, $ystart-10, "1", $border );
imagestring( $image, 2, $xstart-20, 0, "-1", $border );
imagestring( $image, 2, $xstart, $ystart+5, "0", $border );
imagestring( $image, 2, $width-20, $ystart+5, "360", $border );

$datatop = 1;
$databottom = -1;

$oldx = 0;
$oldy = 0;
$datacount = count( $data );
$xscale = ( $width - $xstart ) / $datacount;
$yscale = $ystart / ( $datatop - $databottom );
$midline = $ystart / 2;
for( $i = 0; $i < $datacount; $i++ )
{
$x = $xstart + ( $i * $xscale );
$y = $midline - ( $data[$i] * $yscale );
if ( $i > 0 )
{
imageline( $image, $oldx, $oldy, $x, $y, $border );
}
$oldx = $x;
$oldy = $y;
}header("Content-type: image/png");
imagepng($image);
imagedestroy($image);
?> [ 本帖最后由 jnkq 于 2006-3-25 02:45 编辑 ] 附件 <img src="images/attachicons/image.gif" border="0" class="absmiddle" alt="" /> 01.png (1.08 KB)

2006-3-25 02:34

<img src="attachment.php?aid=739&noupdate=yes" border="0" onload="attachimg(this, 'load')" onmouseover="attachimg(this, 'mouseover')" onclick="zoom(this, 'attachment.php?aid=739')" alt="01.png" />

forest:
好东西，收藏了！

faallan:
瓦靠，B/S架构的“示波器”！！！

fakir:
这个方法更简单呵呵复制内容到剪贴板代码:<?
header("Content-type: image/png");
$im = imagecreatetruecolor(800, 400);
for($x=0;$x<800;$x++){
$y=sin(pi()*$x/200)*100+200;
imagesetpixel($im,$x,$y,255);
};
imagepng($im);
imagedestroy($im);
?>

jnkq:
引用:原帖由 fakir 于 2006-3-25 22:45 发表
[code]
<?
header("Content-type: image/png");
$im = imagecreatetruecolor(800, 400);
for($x=0;$x<800;$x++){
$y=sin(pi()*$x/200)*100+200;
imagesetpixel($im,$x,$y,255);
} ... 您自己看看是不是可以?我这没看出来,一个红叉叉

fakir:
不会吧，我这里显示的老好了，没有问题啊

jnkq:
又看了一下,不行附件 <img src="images/attachicons/image.gif" border="0" class="absmiddle" alt="" /> 01.png (24.06 KB)

2006-3-26 18:59

<img src="attachment.php?aid=741&noupdate=yes" border="0" onload="attachimg(this, 'load')" onmouseover="attachimg(this, 'mouseover')" onclick="zoom(this, 'attachment.php?aid=741')" alt="01.png" />

fakir:
晕，看看我的 [ 本帖最后由 fakir 于 2006-3-26 19:12 编辑 ] 附件 <img src="images/attachicons/image.gif" border="0" class="absmiddle" alt="" /> {D6C1D515-1DAF-418C-ABB4-7C628FA255DC}0.jpg (11.7 KB)

2006-3-26 19:12

<img src="attachment.php?aid=743&noupdate=yes" border="0" onload="attachimg(this, 'load')" onmouseover="attachimg(this, 'mouseover')" onclick="zoom(this, 'attachment.php?aid=743')" alt="{D6C1D515-1DAF-418C-ABB4-7C628FA255DC}0.jpg" />

jnkq:
一样附件 <img src="images/attachicons/image.gif" border="0" class="absmiddle" alt="" /> 01.png (19.54 KB)

2006-3-26 19:12

<img src="attachment.php?aid=742&noupdate=yes" border="0" onload="attachimg(this, 'load')" onmouseover="attachimg(this, 'mouseover')" onclick="zoom(this, 'attachment.php?aid=742')" alt="01.png" />

fakir:
莫非版本不一样？我的是php5……

jnkq:
我的是php5.1.2

fakir:
我的是5.1.1……不至于差这么多吧

fakir:
郁闷！重来一个完整的试试复制内容到剪贴板代码:<?
header("Content-type: image/png");
$picw=800; //图像宽
$pich=400; //图像高
$sizeofsin=100; //比例值 ,要输出不同大小标准正弦只改变它就可以了
$asin=1; //振幅
$tsin=2*pi(); //周期
$aofsin=$asin*$sizeofsin;
$tofsin=$tsin*$sizeofsin;
$im = imagecreate($picw, $pich);
imagecolorallocate($im,255,255,255);
$col=imagecolorallocate($im,0,0,0);
for($x=0;$x<$picw;$x++){
$y=$pich-(sin((2*pi()/$tsin)*$x/$sizeofsin)*$aofsin+$pich/2);
imagesetpixel($im,$x,$y,$col);
if($x % (pi()*$sizeofsin/2)==0){
imageline($im,$x,$pich/2-2,$x,$pich/2+2,$col);
imagestring($im,1,$x+2,$pich/2+3,round($x/$sizeofsin/pi(),1)."pi",$col);
}
};
imageline($im,0,0,0,$pich,$col);
imageline($im,0,$pich/2,$picw,$pich/2,$col);
ImageLine($im,0,$pich/2-$aofsin,5,$pich/2-$aofsin,$col);
imagestring($im,1,10,$pich/2-$aofsin,$aofsin/$sizeofsin,$col);
imagepng($im);
imagedestroy($im);
?>[ 本帖最后由 fakir 于 2006-3-26 23:28 编辑 ] 附件 <img src="images/attachicons/image.gif" border="0" class="absmiddle" alt="" /> {8EBC57E8-A754-48EE-BA9D-8C343AB682D6}0.jpg (7.87 KB)

2006-3-26 22:45

抓图

<img src="attachment.php?aid=745&noupdate=yes" border="0" onload="attachimg(this, 'load')" onmouseover="attachimg(this, 'mouseover')" onclick="zoom(this, 'attachment.php?aid=745')" alt="{8EBC57E8-A754-48EE-BA9D-8C343AB682D6}0.jpg" />

hy0kl:
果然是强中自有强中手;

时至今日我才学到 GD ,真是菜啊;

Sunyanzi:
需要 GD 的支持 ...

hy0kl:
引用:原帖由 Sunyanzi 于 2006-11-8 11:49 发表
需要 GD 的支持 ... 没有 GD 画不出图来.

原文出处：http://bbs.phpchina.com/viewthread.php?tid=3484