先看下最终效果:
下面为PHP代码:
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<li class="alt"><span><span>/****************************** </span></span></li>
<li><span>* 折线图生成函数 </span></li>
<li class="alt"><span>******************************/ </span></li>
<li>
<span>function line_stats_pic($value_y,$width,$high,$</span><span class="attribute">strong</span><span>=</span><span class="attribute-value">1</span><span>,$</span><span class="attribute">fix</span><span>=</span><span class="attribute-value">0</span><span>){ </span>
</li>
<li class="alt"><span>//y值处理函数 </span></li>
<li><span>function line_point_y($num,$width,$high,$max_num_add,$min_num_add,$y_pxdensity){ </span></li>
<li class="alt">
<span> $</span><span class="attribute">return</span><span>=$high-floor(($num-$min_num_add+$y_pxdensity)/(($max_num_add-$min_num_add)/$high)); </span>
</li>
<li><span> return $return; </span></li>
<li class="alt"><span>} </span></li>
<li><span> </span></li>
<li class="alt"><span>//参数处理 </span></li>
<li>
<span>$</span><span class="attribute">allnum</span><span>=</span><span class="attribute-value">sizeof</span><span>($value_y); </span>
</li>
<li class="alt">
<span>$</span><span class="attribute-value">max</span><span class="attribute">max_num</span><span>=max($value_y); //最大值 </span>
</li>
<li>
<span>$</span><span class="attribute-value">min</span><span class="attribute">min_num</span><span>=min($value_y); //最小值 </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">limit_m</span><span>=$max_num-$min_num; //极差 </span>
</li>
<li>
<span>$</span><span class="attribute">max_num_add</span><span>=$max_num+$limit_m*0.1; //轴最大值 </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">min_num_add</span><span>=$min_num-$limit_m*0.1; //轴最小值 </span>
</li>
<li>
<span>$</span><span class="attribute">limit</span><span>=$max_num_add-$min_num_add; //极差-坐标轴y </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">y_pxdensity</span><span>=($max_num_add-$min_num_add)/$high; //y轴密度 </span>
</li>
<li>
<span>$</span><span class="attribute">x_pxdensity</span><span>=</span><span class="attribute-value">floor</span><span>($width/$allnum); //x轴密度 </span>
</li>
<li class="alt"><span>reset($value_y); //将数组指针归零 </span></li>
<li>
<span>$</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>; </span>
</li>
<li class="alt"><span>foreach($value_y as $val){ </span></li>
<li><span> $point_y[$i]=line_point_y($val,$width,$high,$max_num_add,$min_num_add,$y_pxdensity); </span></li>
<li class="alt"><span> $i++; </span></li>
<li><span>} </span></li>
<li class="alt">
<span>$</span><span class="attribute">zero_y</span><span>=</span><span class="attribute-value">line_point_y</span><span>(0,$width,$high,$max_num_add,$min_num_add,$y_pxdensity); //零点的y值 </span>
</li>
<li>
<span>$</span><span class="attribute">empty_size_x</span><span>=(strlen($max_num) </span><span class="tag">></span><span> strlen($min_num) ? strlen($max_num) : strlen($min_num))*5+3; //左边空白 </span>
</li>
<li class="alt"><span> </span></li>
<li><span>//图片流开始 </span></li>
<li class="alt"><span>header("Content-type:image/png"); </span></li>
<li>
<span>$</span><span class="attribute">pic</span><span>=</span><span class="attribute-value">imagecreate</span><span>($width+$empty_size_x+10,$high+13); </span>
</li>
<li class="alt"><span>imagecolorallocate($pic,255,255,255); //背景色 </span></li>
<li>
<span>$</span><span class="attribute">color_1</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($pic,30,144,255); //线条色 </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">color_2</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($pic,0,0,0); //黑色 </span>
</li>
<li>
<span>$</span><span class="attribute">color_3</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($pic,194,194,194);//灰色 </span>
</li>
<li class="alt"><span>//绘制网格 </span></li>
<li><span>imagesetthickness($pic,1); //网格线宽 </span></li>
<li class="alt">
<span>$</span><span class="attribute">y_line_width</span><span>=</span><span class="attribute-value">floor</span><span>($width/100); //纵网格线数目 </span>
</li>
<li>
<span>$</span><span class="attribute">y_line_density</span><span>=$</span><span class="attribute">y_line_width</span><span>==0 ? 0 :floor($width/$y_line_width); //纵网格线密度 </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">point_zero_y</span><span>=$zero_y </span><span class="tag">></span><span> $high ? $high : $zero_y; </span>
</li>
<li><span>imagestring($pic,1,$empty_size_x-1,$high+4,"0",$color_2); //零点数轴标记 </span></li>
<li class="alt">
<span>for($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">1</span><span>;$i </span><span class="tag"><span>= $y_line_width;$i++){ //绘制纵网格线 </span></span>
</li>
<li><span> imagesetthickness($pic,1); //网格线宽 </span></li>
<li class="alt"><span> imageline($pic,$y_line_density*$i+$empty_size_x,0,$y_line_density*$i+$empty_size_x,$high,$color_3); </span></li>
<li><span> imagesetthickness($pic,2); //轴点线宽 </span></li>
<li class="alt"><span> imageline($pic,$y_line_density*$i+$empty_size_x,$point_zero_y-4,$y_line_density*$i+$empty_size_x,$point_zero_y,$color_2); </span></li>
<li><span> imagestring($pic,1,10
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