條形圖中的Rgraph條形顏色

我必須爲我的學校調查項目實施條形圖，並且我認爲我差不多完成了，但沒有什麼能完美實現，這是我的問題。我通過本教程http://www.rgraph.net/docs/integration-with-server-side-scripting.html#mysql實施了此代碼http://www.rgraph.net/docs/bar.html，但我遇到了一個問題。我需要根據它的高度來繪製圖形條，例如等於3的值是綠色的，小於1.5的值是紅色的。代碼我使用看起來像這樣條形圖中的Rgraph條形顏色

print('<script src="../libraries/RGraph.bar.js"></script>' . "\n\n"); 
print('<canvas id="cvs1" width="600" height="200">[No canvas support]</canvas>' . "\n\n"); 
print('<script>' . "\n"); 
print('window.onload = function(){'."\n\n"); 
print('var bar = new RGraph.Bar('.cvs1.', ['.$data_string.'])' . "\n\n"); 
print('.Set(\'labels\',[\'1\',\'2\',\'3\',\'4\',\'5\',\'6\',\'7\',\'8\',\'9\',\'10\',\'11\',\'12\',\'13\',\'14\'])'. "\n\n"); 
print(' .Set(\'colors\', [\'Gradient(#94f776:#50B332:#B1E59F)\', \'Gradient(#94f776:#50B332:#B1E59F)\', \'Gradient(#f2a011:#f2a011:#f2a011:#f2a011)\'])'. "\n\n"); 
print('.Set(\'hmargin\', 15)'. "\n\n"); 
print('.Set(\'strokestyle\', \'white\')'. "\n\n"); 
print('.Set(\'linewidth\', 1)'. "\n\n"); 
print('.Set(\'shadow\', true)'. "\n\n"); 
print('.Set(\'shadow.color\', \'#ccc\')'. "\n\n"); 
print('.Set(\'shadow.offsetx\', 0)'. "\n\n"); 
print('.Set(\'shadow.offsety\', 0)'. "\n\n"); 
print('.Set(\'shadow.blur\', 10)'. "\n\n"); 
print('.Set(\'ymax\', 5)'. "\n\n"); 
print('.Set(\'colors.sequential\', true)'. "\n\n"); 
print('.Draw();'. "\n\n"); 
print('}'. "\n\n"); 
print('</script>'. "\n\n");

如果這一個 print('var bar = new RGraph.Bar('.cvs1.', ['.$data_string.'])' . "\n\n"); 是從數據庫中獲取數據的代碼。我試圖寫簡單的PHP和甚至foreach循環打印顏色，但它沒有奏效。代碼看起來像這樣

foreach($data_string as $param) 
if ($param<1){ 
    return(' .Set(\'colors\', [\'Gradient(#FF0000:#FF0000:#FF0000)\'])'. "\n\n"); 
} 
else if($param<=2){ 
    return(' .Set(\'colors\', [\'Gradient(#f2a011:#f2a011:#f2a011:#f2a011)\'])'. "\n\n"); 
} 
else 
    return(' .Set(\'colors\', [\'Gradient(#94f776:#50B332:#B1E59F)\'])'. "\n\n"); 
}

我相信爲foreach循環準備數據的代碼是好的，因爲我用它來顯示HTML表格中的數據顏色。請問有什麼解決

來源

2014-01-19 TroubleMaker

PHP：

<?php 
    $colors = array(); 

    foreach($data_string as $param) { 
     if ($param < 1) { 
      $colors[] = 'red'; 
     } 

     if ($param > 3) { 
      $colors[] = 'green'; 
     } 
    } 

    $colors_str = implode(', ', $colors); 
?>

的JavaScript

obj.Set('colors', [ <?php echo $colors_str; ?> ]);

PS。如果切換到HTML模式，則不需要在PHP代碼中進行太多的引號轉義。或跨越多行跨越字符串 - 並小心使用引號。像這樣：

PHP：

<?php 
    print("obj.Set('colors', ['red', green', 'blue'])\n\n"); 
?>

來源

2014-01-20 10:40:31 Richard

條形圖中的Rgraph條形顏色

回答

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