PHP绘制心电形状曲线统计图表[源码]_PHP教程

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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>,$</span><span class="attribute">fix</span><span>=</span><span class="attribute-value">0</span><span>){  </span>
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<li class="alt"><span>//y值处理函数  </span></li>
<li><span>function line_point_y($num,$width,$high,$max_num_add,$min_num_add,$y_pxdensity){  </span></li>
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<span>    $</span><span class="attribute">return</span><span>=$high-floor(($num-$min_num_add+$y_pxdensity)/(($max_num_add-$min_num_add)/$high));  </span>
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<li><span>    return $return;  </span></li>
<li class="alt"><span>}  </span></li>
<li><span> </span></li>
<li class="alt"><span>//参数处理  </span></li>
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<span>$</span><span class="attribute">allnum</span><span>=</span><span class="attribute-value">sizeof</span><span>($value_y);  </span>
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<span>$</span><span class="attribute-value">max</span><span class="attribute">max_num</span><span>=max($value_y);                            //最大值  </span>
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<span>$</span><span class="attribute-value">min</span><span class="attribute">min_num</span><span>=min($value_y);                            //最小值  </span>
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<span>$</span><span class="attribute">limit_m</span><span>=$max_num-$min_num;                        //极差  </span>
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<span>$</span><span class="attribute">max_num_add</span><span>=$max_num+$limit_m*0.1;                //轴最大值  </span>
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<span>$</span><span class="attribute">min_num_add</span><span>=$min_num-$limit_m*0.1;                //轴最小值  </span>
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<span>$</span><span class="attribute">limit</span><span>=$max_num_add-$min_num_add;                 //极差-坐标轴y  </span>
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<span>$</span><span class="attribute">y_pxdensity</span><span>=($max_num_add-$min_num_add)/$high;    //y轴密度  </span>
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<span>$</span><span class="attribute">x_pxdensity</span><span>=</span><span class="attribute-value">floor</span><span>($width/$allnum);                //x轴密度  </span>
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<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,$y_pxdensity);    //零点的y值  </span>
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<span>$</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>
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<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>
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<span>$</span><span class="attribute">pic</span><span>=</span><span class="attribute-value">imagecreate</span><span>($width+$empty_size_x+10,$high+13);  </span>
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<li class="alt"><span>imagecolorallocate($pic,255,255,255);         //背景色  </span></li>
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<span>$</span><span class="attribute">color_1</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($pic,30,144,255); //线条色  </span>
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<li class="alt">
<span>$</span><span class="attribute">color_2</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($pic,0,0,0);     //黑色  </span>
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<span>$</span><span class="attribute">color_3</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($pic,194,194,194);//灰色  </span>
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<li class="alt"><span>//绘制网格  </span></li>
<li><span>imagesetthickness($pic,1);                    //网格线宽  </span></li>
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<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>
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<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>
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<li class="alt">
<span>$</span><span class="attribute">point_zero_y</span><span>=$zero_y </span><span class="tag">></span><span> $high ? $high : $zero_y;  </span>
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<li><span>imagestring($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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<span id="url" itemprop="url">http://www.bkjia.com/PHPjc/486091.html</span><span id="indexUrl" itemprop="indexUrl">www.bkjia.com</span><span id="isOriginal" itemprop="isOriginal">true</span><span id="isBasedOnUrl" itemprop="isBasedOnUrl">http://www.bkjia.com/PHPjc/486091.html</span><span id="genre" itemprop="genre">TechArticle</span><span id="description" itemprop="description">先看下最终效果: 下面为PHP代码: /****************************** *折线图生成函数 ******************************/ functionline_stats_pic($value_y,$width,$high,$ str...</span>
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