How to use PHP's GD library to draw an anti-aliasing slash

How do I use the PHP GD library to draw an anti-aliasing slash?
Title, a fill chart with a polygon draw is jagged. The Imageantialias function is not valid.

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Bitmap aliasing is inevitable.
Imageantialias anti-aliasing is useful, you can compare the effect when he turns on and off
If you are not satisfied with the effect of Imageantialias (after all, GD is not a professional image processing package), then you have to solve your own programming

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He's an scrambling cipher, and he's free to study.
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It's so boring, and finally it's JS.
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JS has ready-made plug-ins to do out of the very beautiful ... What do you do with PHP?
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Give you an early written code, for reference

PHP Code

  Create (Func_get_arc (0), Func_get_arc (1));  else $this->create (400,300);    /** * Draw dots at ($x, $y) * * function pixel ($x, $y) {$p = $this->get_view ($x, $y);    Imagesetpixel ($this->im, $p [' X '], $p [' Y '], $this->color);    $this->xo = $p [' x '];  $this->yo = $p [' y '];    /** * Move to ($x, $y) */function MoveTo ($x, $y) {$p = $this->get_view ($x, $y);    $this->xo = $p [' x '];  $this->yo = $p [' y '];    }/** * FROM ($x 1, $y 1) to ($x 2, $y 2) Draw line */function lines ($x 1, $y 1, $x 2, $y 2) {$p 1 = $this->get_view ($x 1, $y 1);    $p 2 = $this->get_view ($x 2, $y 2);  Imageline ($this->im, $p 1[' x '], $p 1[' y '], $p 2[' x '], $p 2[' y '), $this->color);    /** * Draw line from current position to ($x, $y) * * Function LineTo ($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 = $p [' y '];     }/** * Sets the current color */function color ($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 $this->color;     }/** * Sets the current fill color */function FillColor ($clr) {$r = ($clr >>16) & 0xFF;     $g = ($clr >>8) & 0xFF;     $b = ($CLR) & 0xFF;    $this->fillcolor = imagecolorallocate ($this->im, $r, $g, $b);  return $this->fillcolor; /** * Create a GD handle and set the coordinate system */function Create ($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-&GT;ORGX = 0;    $this->orgy = 0;//$y;    $this->colors = $this->color (0XFFFFFF);    Settype ($this->ksin, "double"); Settype ($tHis->kcos, "double");    $this->ksin = sin (deg2rad (0));  $this->kcos = cos (deg2rad (0));    }/** * Coordinate mapping */function Get_view ($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 $p;    }/** * Set limit */function Set_ext ($x, $y =0) {$this->winx = $x;    if ($y = = 0) {$this->winy =-$x * $this->viewy/$this->viewx;    }else {$this->winy = $y;    }}/** * Set rotation angle */function Set_r ($p) {$this->ksin = sin (Deg2rad ($p));  $this->kcos = cos (Deg2rad ($p));     }/** * Constructs graphics that must be overloaded in derived classes this method */function Paint () {/** * must be overloaded by derived classes * must contain statements $this->create (width, height);  */Die ("The paint method must be overloaded by derived classes!");    }/** * Output graphics */function run () {$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);    }/** * Round graph data generation, parameter $p coordinates rotation angle */function Get_point ($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 $rs; /** * Bow */function chord ($left, $top, $w, $h, $start, $end, $z =0) {$ar = $this->get_point ($left, $top, $w, $h, $sta    RT, $end, $p); for ($i =0; $i
  
   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, $this->color);    }/** * Fan */function Pie ($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
   
    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, $this->fillcolor); }/** * Arc */function arc ($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
    
     
       LineTo ($ar [$i], $ar [$i +1]);    }}/** * The Paint method of the overloaded base class */class Mygraph extends Graph {function paint () {//$this->create (400,300);    $this->create (200,150), $this->set_ext (400); $this->set_r (10); Rotation $this->filltype = false;    Filling $k = 40;    High $a = 200;    Center x $b = 150;    Center y $c = 200;    Long axis $d = 100;    Short axis $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 *);  $this->line (0, $b, $a * *, $b); 
 }} $g = new mygraph; $g->run (); 
      
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