常用php函数[08]：生成曲线图的類-远方教程

<?php
class LabelFormat{
var $width;
var $precision;
var $specific;
var $vertical;
var $fontsize;
var $fun;
function LabelFormat ($width=0, $prec=1, $spec="f", $fontsize=3, $vert=0, $function="") {
$this->fun=$function;
$this->width=$width;
$this->precision=$prec;
$this->specific=$spec;
$this->fontsize=$fontsize;
$this->vertical=$vert;
}
function Out ($value){
//$this->fun=$fun;
$format_string="%";
if ($this->width)
$format_string.=$this->width;
if ($this->precision)
$format_string.=".".$this->precision;
$format_string.=$this->specific;
if (!empty($this->fun)){
$out=call_user_func ($this->fun, $value);
$wstring=sprintf($format_string, $out);
}
else
$wstring=sprintf($format_string, $value);
return $wstring;
}
}
class graph2d{
var $image_type;
var $dimx;
var $dimy;
var $xmin;
var $xmax;
var $ymin;
var $ymax;
var $xstep;
var $ystep;
var $xskip;
var $yskip;
var $xformat;
var $yformat;
var $b_red;
var $b_green;
var $b_blue;
var $b_alpha;
var $a_red;
var $a_green;
var $a_blue;
var $a_alpha;
var $is_grid;
var $grid_red;
var $grid_green;
var $grid_blue;
//var $grid_style;
var $top;
var $left;
var $right;
var $bottom;
var $xlegend;
var $ylegend;
var $title;
var $image;
function graph2d ($image_type, $width, $height, $xleft=0, $ytop=0, $xright=0, $ybottom=0, $br=0xFF, $bg=0xFF, $bb=0xFF, $b_alpha=0, $ar=0, $ag=0, $ab=0, $a_alpha=0)
{
$this->image_type=$image_type;
$this->dimx=(int)$width;
$this->dimy=(int)$height;
$this->b_red=(int)$br;
$this->b_green=(int)$bg;
$this->b_blue=(int)$bb;
$this->a_red=(int)$ar;
$this->a_green=(int)$ag;
$this->a_blue=(int)$ab;
$this->a_alpha=(int)$a_alpha;
$this->b_alpha=(int)$b_alpha;
$this->left=(int)$xleft;
$this->top=(int)$ytop;
$this->right=(int)$xright;
$this->bottom=(int)$ybottom;
$this->xskip=1;
$this->yskip=1;
$this->xformat=new LabelFormat();
$this->yformat=new LabelFormat();
$this->xlegend="";
$this->ylegend="";
$this->title="";
$this->is_grid=FALSE;
//$this->grid_style=array();
$imtype="Content-type: image/".$this->image_type;
header ($imtype);
$this->image=@imagecreate ($this->dimx, $this->dimy);// or die "Cannot initialize new GD Image stream";
}
function SetAxisScales ($xmin, $xmax, $xstep, $xskip, $ymin, $ymax, $ystep, $yskip)
{
$this->xmin=(double)$xmin;
$this->xmax=(double)$xmax;
$this->xstep=(double)$xstep;
$this->xskip=(int)$xskip;
$this->ymin=(double)$ymin;
$this->ymax=(double)$ymax;
$this->ystep=(double)$ystep;
$this->yskip=(int)$yskip;
}
function SetXLegend ($xleg) { $this->xlegend=$xleg; }
function SetYLegend ($yleg) { $this->ylegend=$yleg; }
function SetTitle ($title) { $this->title=$title; }
function SetLineThickness ($thikness)
{
if ( is_resource ($this->image) && is_int ($thikness))
imagesetthickness ($this->image, $thikness);
}
function SetGrid($grid, $red, $green, $blue)
{
$this->is_grid=$grid;
$this->grid_red=$red;
$this->grid_green=$green;
$this->grid_blue=$blue;
//$this->grid_style=$style;
}
function GraphCoord ()
{
if (function_exists("imagecolorallocatealpha"))
{
$background=imagecolorallocatealpha ($this->image, $this->b_red, $this->b_green, $this->b_blue, $this->b_alpha);
$foreground=imagecolorallocatealpha ($this->image, $this->a_red, $this->a_green, $this->a_blue, $this->a_alpha);
}
else
{
$background=imagecolorallocate ($this->image, $this->b_red, $this->b_green, $this->b_blue);
if ($this->b_alpha)
imagecolortransparent($this->image, $background);
$foreground=imagecolorallocate ($this->image, $this->a_red, $this->a_green, $this->a_blue);
}
$X=$this->dimx-($this->left+$this->right);
$Y=$this->dimy-($this->top+$this->bottom);
$scaleX=($this->xmax-$this->xmin)/$X;
$scaleY=($this->ymax-$this->ymin)/$Y;
$gcolor=imagecolorallocate ($this->image, $this->grid_red, $this->grid_green, $this->grid_blue);
if ($this->is_grid)
$coord=imagerectangle($this->image, $this->left, $this->top, $this->dimx-$this->right, $this->dimy-$this->bottom, $gcolor);
else
$coord=imagerectangle($this->image, $this->left, $this->top, $this->dimx-$this->right, $this->dimy-$this->bottom, $foreground);
if (!empty($this->title))
imagestring ($this->image, 4, $this->left+$X/2-strlen($this->title)*imagefontwidth(4)/2, $this->top/2-imagefontheight(4)/2, $this->title, $foreground);
$numx=($this->xmax-$this->xmin)/$this->xstep+1;
$numy=($this->ymax-$this->ymin)/$this->ystep+1;
for ($i=0; $i<$numx; $i++)
{
$x=($i*$X)/($numx-1)+$this->left;
if ($i>0 && $i<$numx-1)
if ($this->is_grid)
imageline ($this->image, $x, $Y+$this->top, $x, $this->top, $gcolor);
else
imageline ($this->image, $x, $Y+$this->top-5, $x, $Y+$this->top+5, $foreground);
if ($i%$this->xskip==0)
{
$xstr=$this->xformat->Out($this->xmin+($i*$X)*$scaleX/($numx-1));
if ($this->xformat->vertical)
imagestringup ($this->image, $this->xformat->fontsize, $x-imagefontwidth($this->xformat->fontsize), $Y+$this->top+strlen($xstr)*imagefontheight($this->xformat->fontsize)/2+5, $xstr, $foreground);
else
imagestring ($this->image, $this->xformat->fontsize, $x-strlen($xstr)*imagefontwidth($this->xformat->fontsize)/2, $Y+$this->top+imagefontheight($this->xformat->fontsize)/2, $xstr, $foreground);
}
}
if (!empty($this->xlegend))
imagestring ($this->image, 3, $this->left+$X/2, $this->top+$Y+3*imagefontheight(3)/2, $this->xlegend, $foreground);
for ($i=0; $i<$numy; $i++)
{
$y=($i*$Y)/($numy-1);
if ($i>0 && $i<$numy-1)
if ($this->is_grid)
imageline ($this->image, $this->left-5, $y+$this->top, $this->left+$X, $y+$this->top, $gcolor);
else
imageline ($this->image, $this->left-5, $y+$this->top, $this->left+5, $y+$this->top, $foreground);
if ($i%$this->yskip==0)
{
$ystr=$this->yformat->Out($this->ymin+($i*$Y)*$scaleY/($numy-1));
if ($this->yformat->vertical)
imagestringup ($this->image, $this->yformat->fontsize, $this->left-imagefontheight($this->yformat->fontsize)-5, $Y+$this->top+$this->bottom-$y-3*strlen($ystr)*imagefontwidth($this->yformat->fontsize)/2, $ystr, $foreground);
else
imagestring ($this->image, $this->yformat->fontsize, $this->left-strlen($ystr)*imagefontwidth($this->yformat->fontsize)-5, $Y+$this->top-$y-imagefontheight($this->yformat->fontsize)/2, $ystr, $foreground);
}
}
if (!empty($this->ylegend))
imagestringup ($this->image, 3, $this->left/2-3*imagefontheight(3)/2, $this->top+$Y/2+strlen($this->ylegend)*imagefontwidth(3)/2, $this->ylegend, $foreground);
}
function Draw ($xarray, $yarray, $r=0, $g=0, $b=0)
{
if (!is_array($xarray) || !is_array($yarray)) return;
if (function_exists("imagecolorallocatealpha"))
{
$background=imagecolorallocatealpha ($this->image, $this->b_red, $this->b_green, $this->b_blue, $this->b_alpha);
$foreground=imagecolorallocatealpha ($this->image, $this->a_red, $this->a_green, $this->a_blue, $this->a_alpha);
}
else
{
$background=imagecolorallocate ($this->image, $this->b_red, $this->b_green, $this->b_blue);
if ($this->b_alpha)
imagecolortransparent($this->image, $background);
$foreground=imagecolorallocate ($this->image, $this->a_red, $this->a_green, $this->a_blue);
}
$graphcolor=imagecolorallocate ($this->image, $r, $g, $b);
$X=$this->dimx-($this->left+$this->right);
$Y=$this->dimy-($this->top+$this->bottom);
$scaleX=($this->xmax-$this->xmin)/$X;
$scaleY=($this->ymax-$this->ymin)/$Y;
$numx=($this->xmax-$this->xmin)/$this->xstep+1;
$numy=($this->ymax-$this->ymin)/$this->ystep+1;
$nx=count($xarray);
$ny=count($yarray);
$n=min($nx, $ny);
for ($i=1; $i<$n; $i++)
imageline($this->image, $this->left+($xarray[$i-1]-$this->xmin)/$scaleX, $this->top+($this->ymax-$yarray[$i-1])/$scaleY, $this->left+($xarray[$i]-$this->xmin)/$scaleX, $this->top+($this->ymax-$yarray[$i])/$scaleY, $graphcolor);
}
function ImageOut ($filename)
{
if (strcasecmp ($this->image_type, "jpeg")==0)
imagejpeg ($this->image, $filename, 100);
elseif (strcasecmp ($this->image_type, "png")==0)
imagepng ($this->image, $filename, 100);
elseif (strcasecmp ($this->image_type, "gif")==0)
imagegif ($this->image, $filename, 100);
elseif (strcasecmp ($this->image_type, "wbmp")==0)
imagewbmp ($this->image, $filename, 100);
}
function Close ()
{
imagedestroy ($this->image);
}
}
?>