如何使用php的gd库画一条抗锯齿的粗斜线?

[luojxun]

如题，使用多边形画的填充图是有锯齿的。imageantialias函数是无效的。

[luojxun]

[Quote=引用 4 楼 的回复:]

好无聊啊，最终是用 js 实现的
[/Quote]
呵呵，我没有源码不知道是不是php实现的，看介绍“The phpChart is a fully featured Ajax PHP control for generating dynamic PHP charts and graphics. ”用js可能性比较高。不过我试了一下使用画矩形，旋转图片，最后贴上去可以，不过会不太精准。

[luojxun]

[Quote=引用 5 楼 的回复:]

JS有现成的插件 做出来的很漂亮。。。用PHP干嘛
[/Quote]
js实现有一个缺点就是不能保存，使用php生成图片就可以保存了。这个需求应该有吧，呵呵。

[xuzuning]

给你一个早年写的代码，供参考

<?php
//error_reporting(E_ALL ^ E_NOTICE);

class Graph {
  /**
   * 伪3D绘图类
   */
  var $im;
  var $type = "gif"; // png,gif,jpeg,wbmp
  var $xo;
  var $yo;
  var $color;
  var $fillcolor;
  var $filldarkcolor;
  var $filltype = true;
  var $orgx;
  var $orgy;
  var $viewx;
  var $viewy;
  var $winx;
  var $winy;
  var $extx = 1;
  var $exty = -1;
  var $ksin;
  var $kcos;

  function Graph() {
	if(func_num_args() == 2)
		$this->create(func_get_arc(0),func_get_arc(1));
	else
		$this->create(400,300);
  }
  /**
   * 在($x,$y)处画点
   */
  function pixel($x,$y) {
	$p = $this->get_view($x,$y);
	imagesetpixel($this->im,$p['x'],$p['y'],$this->color);
	$this->xo = $p['x'];
	$this->yo = $p['y'];
  }
  /**
   * 移动到($x,$y)处
   */
  function moveto($x,$y) {
	$p = $this->get_view($x,$y);
	$this->xo = $p['x'];
	$this->yo = $p['y'];
  }
  /**
   * 从($x1,$y1)到($x2,$y2)处画线
   */
  function line($x1,$y1,$x2,$y2) {
	$p1 = $this->get_view($x1,$y1);
	$p2 = $this->get_view($x2,$y2);
	imageline($this->im,$p1['x'],$p1['y'],$p2['x'],$p2['y'],$this->color);
  }
  /**
   * 从当前位置到($x,$y)处画线
   */
  function lineto($x,$y) {
	$p = $this->get_view($x,$y);
	imageline($this->im, $this->xo, $this->yo, $p['x'], $p['y'], $this->color);
	$this->xo = $p['x'];
	$this->yo = $p['y'];
  }
  /**
   * 设置当前颜色
   */
  function color($clr) {
	$r = ($clr>>16) & 0xff; 
	$g = ($clr>>8) & 0xff; 
	$b = ($clr) & 0xff; 
	$this->color = ImageColorAllocate($this->im, $r,$g,$b);
	$this->fillcolor = ImageColorAllocate($this->im, $r,$g,$b);
	$this->filldarkcolor = ImageColorAllocate($this->im, $r/2,$g/2,$b/2);
	return $this->color;
  }
  /**
   * 设置当前充填颜色
   */
  function fillcolor($clr) {
	$r = ($clr>>16) & 0xff; 
	$g = ($clr>>8) & 0xff; 
	$b = ($clr) & 0xff; 
	$this->fillcolor = ImageColorAllocate($this->im, $r,$g,$b);
	return $this->fillcolor;
  }
  /**
   * 创建GD句柄并设置坐标系
   */
  function create($x,$y) {
	$this->im = imagecreatetruecolor($x,$y);
imageantialias($this->im, 1);
imagefill($this->im, 0, 0, $this->color(0xffffff));
	$this->viewx = $x-1;
	$this->viewy = -($y-1);
	$this->winx = $x;
	$this->winy = $y;
	$this->orgx = 0;
	$this->orgy = 0;//$y;
	$this->colors = $this->color(0xffffff);

	settype($this->ksin,"double");
	settype($this->kcos,"double");
	$this->ksin = sin(deg2rad(0));
	$this->kcos = cos(deg2rad(0));
  }
  /**
   * 坐标映射
   */
  function get_view($x,$y) {
	$this->xo = $x*$this->kcos - $y*$this->ksin;
	$this->yo = $x*$this->ksin + $y*$this->kcos;
	$p['x'] = ($this->xo + $this->orgx)*($this->viewx/$this->winx);
	$p['y'] = ($this->yo + $this->orgy)*($this->viewy/$this->winy)-$this->viewy;
	return $p;
  }
  /**
   * 设置限度
   */
  function set_ext($x,$y=0) {
	$this->winx = $x;
	if($y == 0) {
		$this->winy = - $x * $this->viewy / $this->viewx;
	}else {
		$this->winy = $y;
	}
  }
  /**
   * 设置旋转角
   */
  function set_r($p) {
	$this->ksin = sin(deg2rad($p));
	$this->kcos = cos(deg2rad($p));
  }
  /**
   * 构造图形，必需在派生类中重载本方法
   */
  function paint() {
	/**
	 * 必需由派生类重载
	 * 必需包含语句 $this->create(宽度,高度);
	 */
	die("paint 方法必需由派生类重载!");
  }
  /**
   * 输出图形
   */
  function run() {
	$this->paint();
	$func = "Image".$this->type;
	if(! function_exists($func)) {
		$this->type = "png";
		$func = "Image".$this->type;
	}
	Header("Content-type: image/{$this->type}");
	$func($this->im);
	imageDestroy($this->im);
  }

  /**
   * 圆类图形数据生成，参数$p为坐标旋转角
   */
  function get_point($ox,$oy,$w,$h,$start,$end) {
	$a = $w/2;
	$b = $h/2;
	$rs = array();
	$i = $start;
	for($i=$start;$i<=$end;$i+=5) {
		$n = deg2rad($i);
		$x = $a*cos($n);
		$y = $b*sin($n);
		$p = $this->get_view($ox+$x,$oy+$y);
		$rs[] = $p['x'];
		$rs[] = $p['y'];
		if($i == $end) break;
		if($i+5 > $end) $i = $end - 5;
	}
	$p = $this->get_view($ox,$oy);
	$rs[] = $p['x'];
	$rs[] = $p['y'];
	$rs[] = $rs[0];
	$rs[] = $rs[1];
	return $rs;
  }
  /**
   * 弓形
   */
  function chord($left,$top,$w,$h,$start,$end,$z=0) {
	$ar = $this->get_point($left,$top,$w,$h,$start,$end,$p);
	for($i=0;$i<count($ar);$i+=2) {
		$p = $this->get_view($ar[$i],$ar[$i+1]);
		$ar[$i] = $p['x'];
		$ar[$i+1] = $p['y'];
	}
	imagefilledpolygon($this->im,$ar,count($ar)/2-1,$this->fillcolor);
	imagepolygon($this->im,$ar,count($ar)/2-1,$this->color);
  }
  /**
   * 扇形
   */
  function pie($left,$top,$w,$h,$start,$end,$z=0) {
	$this->get_view($left,$top+$z);
	$ar = $this->get_point($left,$top+$z,$w,$h,$start,$end);
	$this->get_view($left,$top);
	$arh = $this->get_point($left,$top,$w,$h,$start,$end);
	for($j=0;$j<count($ar)-2;$j+=2) {
		$t= array($ar[$j],$ar[$j+1],$ar[$j+2],$ar[$j+3],$arh[$j+2],$arh[$j+3],$arh[$j],$arh[$j+1]);
		if($this->filltype)
			imagefilledpolygon($this->im,$t,4,$this->filldarkcolor);
		else
			imagepolygon($this->im,$t,4,$this->color);
	}
	if($this->filltype)
		imagefilledpolygon($this->im,$ar,count($ar)/2-1,$this->fillcolor);
  }
  /**
   * 弧形
   */
  function arc($left,$top,$w,$h,$start,$end,$z=0) {
	$ar = $this->get_point($left,$top,$w,$h,$start,$end,$p);
	$this->moveto($ar[0],$ar[1]);
	for($i=2;$i<count($ar)-2;$i+=2)
		$this->lineto($ar[$i],$ar[$i+1]);
  }
}

/**
 * 重载基类的paint方法
 */
class myGraph extends Graph {
  function paint() {
//	$this->create(400,300);
	$this->create(200,150);
$this->set_ext(400);
	$this->set_r(10); // 旋转
	$this->filltype = false; //充填
	$k = 40;	//高
	$a =200;	//中心x
	$b = 150;	//中心y
	$c = 200;	//长轴
	$d = 100;	//短轴

	$this->color(0x000000);
	$this->color(0xff0000);
	$this->pie($a,$b,$c,$d,0,100,$k);
	$this->color(0x00ff00);
	$this->pie($a,$b,$c,$d,120,240,$k);
	$this->color(0x0000ff);
	$this->pie($a+10,$b-10,$c,$d,240,360,$k);
	$this->color(0x8080ff);
	$this->pie(50,80,40,20,0,360,50);
	$this->line($a,0,$a,$b*2);
	$this->line(0,$b,$a*2,$b);
  }
}

$g = new myGraph;
$g->run();

[༺ཌༀཉི浮华背后༃ༀད༻]

现在的ChartDirector有破解版，里面有个封装好的函数库：phpchartdir.php。直接用就行了。

[xuzuning]

点阵图有锯齿是必然的
imageantialias 的抗锯齿是有作用的，你可以对比他打开和关闭时的效果
如果你对 imageantialias 的效果不满意（毕竟GD不是专业的图像处理包），那就要你自己编程解决了

[luojxun]

[Quote=引用 1 楼 的回复:]

点阵图有锯齿是必然的
imageantialias 的抗锯齿是有作用的，你可以对比他打开和关闭时的效果
如果你对 imageantialias 的效果不满意（毕竟GD不是专业的图像处理包），那就要你自己编程解决了
[/Quote]
imageantialias 的抗锯齿没有作用，当你用imagefilledpolygon时。
我看phpChart这个商业的报表现实得挺好，就不知道它是怎么实现的

[xuzuning]

他是扰码加密的，有空研究一下

[xuzuning]

好无聊啊，最终是用 js 实现的

[yijian5220]

JS有现成的插件 做出来的很漂亮。。。用PHP干嘛