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• Warning: Cannot modify header information - headers already sent by

  - by bhaskaragr29

  When i try run this file i am getting this error. <?php $im = imagecreatetruecolor(100, 100); // sets background to red $red = imagecolorallocate($im, 255, 0, 0); imagefill($im, 0, 0, $red); header('Content-type: image/png'); imagepng($im); imagedestroy($im); ?> Warning: Cannot modify header information - headers already sent by (output…

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• Problem drawing a polygon on data clusters in MATLAB

  - by Hossein

  Hi, I have some data points which I have devided into them into some clusters with some clustering algorithms as the picture below:(it might takes some time for the image to appear) Each color represents different cluster. I have to draw polygons around each cluster. I use convhull for this reason. But as you can see the polygon for the red…

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• How to use a proprety/value table in MySQL

  - by David

  I inherited a mysql database that has a table with columns like this: object_id, property, value It holds data like this: 1,first_name,Jane 1,last_name,Doe 1,age,10 1,color,red 2,first_name,Mike 2,last_name,Smith 2,age,20 2,color,blue 3,first_name,John 3,last_name,Doe 3,age,20 3,color,red ... Basically what I want to do is treat this…

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• MySQL GROUP_CONCAT + IN() = missing data :-(

  - by Andrew Heath

  Example: Table: box boxID color 01 red 02 blue 03 green Table: boxHas boxID has 01 apple 01 pear 01 grapes 01 banana 02 lime 02 apple 02 pear 03 chihuahua 03 nachos 03 baby crocodile I want to query on the contents of each box, and return a table with each ID, color,…

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• Change background colour of individual elements on the fly

  - by John

  Hi, Is there a way in CSS or JQuery where I can dynamically change the background of li tags so they get slightly lighter for each element until it gets to white. For example say I had a list of 10 li elements. The first would have a red (#ff0000) background, the next one would then be a lighter shade of red, and so on and so on until we…

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• In which order are CSS styles applied?

  - by citronas

  I have the following HTML. <ul> <li> <a>asdas</a> </li> </ul> In my CSS stylesheet I have general settings for the a tag, and several hundered lines later settings for ul li a. Like this: a:link { color: red; } ... ul li a { color:blue; } Firebug tells me, that first the color:blue is…

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• jQuery - OnClick, change background color for table cells

  - by andrew

  Hi all, Let me show you a demo: here it is working for only rows. its not working for cells. i want to change cells' (tds') background colors with mouse clicks. For example: a have a table, and it has 4 tds. table's background color is white. if i click to a td, a td should be red, than if i click to b, b td should be red and a td…

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• Loop colours from variables for graphics.py [Python 3.2]

  - by user1056548

  I am creating a graphics program that draws 100 x 100 squares next to each other depending on the user-specified grid size. The user also inputs 4 colours for the squares to be coloured (e.g. if they enter red,green,blue,yellow the squares will be coloured in that order, repeating the colours). Is it possible to loop the colours…

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• Changing the tint of a bitmap while preserving the overall brightness

  - by MusiGenesis

  I'm trying to write a function that will let me red-shift or blue-shift a bitmap while preserving the overall brightness of the image. Basically, a fully red-shifted bitmap would have the same brightness as the original but be thoroughly red-tinted (i.e. the G and B values would be equal for all pixels). Same for blue-tinting…

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• Using Cases to change background colour | Visual Studio 2008

  - by Simon

  I really need help working with cases, I'm only learning it so far, but just can't get a drop down menu to work that would change the background of a Textbox. Private Sub cbColours_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbColours.SelectedIndexChanged Select Case colours …

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• C/C++ enum and char * array

  - by Eric M

  Ran accross the following code in an article and didn't think it was standard C/C++ syntax for the char* array. As a test, both Visual C++ (visual studio 2005) and C++ Builder Rad XE both reject the 2nd line. Without using #defines, anyone have any tricks/tips for keeping enums and a string array sort of in sync without…

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• Database table design vs. ease of use.

  - by Gastoni

  I have a table with 3 fields: color, fruit, date. I can pick 1 fruit and 1 color, but I can do this only once each day. examples: red, apple, monday red, mango, monday blue, apple, monday blue, mango, monday red, apple, tuesday The two ways in which I could build the table are: 1.- To have color, fruit and date be a…

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• C# Custom Brush - I want two gradients chaining them together.

  - by Logan

  I am making a bar chart and I want two separate gradients for each bar. First I want a gradient to go from top to bottom solid red to transparent red. I want to paint over the top of that a gradient that goes from right to left, black to opaque. So - In the bottom left we should have; Bottom left - Alpha 0 Bottom right…

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• jQuery drag and drop behavior with partially transparent image

  - by Aaron

  I'm trying to develop a drag-and-drop behavior based on the jQuery UI draggable behavior but am running into some road blocks. I want to be able to drag several images with transparent regions around a region of the screen. I want the user to be able to drag the image he clicks and not just whatever draggable div or PNG…

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• jquery .add() is weird

  - by phil

  Hi folks. Why all elements turn red? I only intend to turn <p> red. <ul> <li>list item 1</li> <li>list item 2</li> <li>list item 3</li> </ul> <p>a paragraph</p> <script> $('li').add('p').css('background-color', 'red'); </script>

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• Separating an Array into a comma seperated string with quotes

  - by user548744

  I'm manually building an SQL query where I'm using an Array in the params hash for an SQL IN statement, like: ("WHERE my_field IN('blue','green','red')"). So I need to take the contents of the array and output them into a string where each element is single quoted and comma seperated (and with no ending comma). So if…

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• Is there a name for this type of algorithm?

  - by rehanift

  I have a 2 dimensional array forming a table: [color][number][shape ] ------------------------- [black][10 ][square ] [black][10 ][circle ] [red ][05 ][triangle] [red ][04 ][triangle] [green][11 ][oval ] and what I want to do is group largest common denominators, such that we get: 3 groups …

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• Stable separation for two classes of elements in an array

  - by AndreyT

  Consider the following problem. We are given an array of elements belonging to one two classes: either red or blue. We have to rearrange the elements of the array so that all blue elements come first (and all red elements follow). The rearrangement must be done is stable fashion, meaning that the relative order of…

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• Custom Brush - I want two gradients chaining them together.

  - by Logan

  I am making a bar chart and I want two separate gradients for each bar. First I want a gradient to go from top to bottom solid red to transparent red. I want to paint over the top of that a gradient that goes from right to left, black to opaque. So - In the bottom left we should have; Bottom left - Alpha 0…

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• WPF. Can I dinamically make part of the TextBlock.Text to different colour?

  - by Bobb

  I have TextBlock in my main form. I set the Text property to different strings during the application run. I would like to be able to colour parts of particular strings. Say (pseudo-code) if(a < 0) txbStatus.Text = string.Format("{0} <RED>{1}</RED>", a, b); else txbStatus.Text =…

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• How to display and change an icon inside a python Tk Frame

  - by codingJoe

  I have a python Tkinter Frame that displays several fields. I want to also add an red/yellow/green icon that will display the status of an external device. The icon is loaded from a file called ICON_LED_RED.ico. How do I display the icon in my frame? How do I change the icon at runtime? for example…

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• how to set length and postion for repeat-x and scroll background-image?

  - by user550945

  Hi all, I have an to set background image. it is a red line under the input value. background-attachment:scroll; background-color:#FFFFFF; background-image:url("../images/errorLine.gif"); background-position:left bottom; background-repeat:repeat-x; the input value is like "123; 456; 789;". the red…

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• SEO URL Structure

  - by Neil

  Based on the following example URL structure: mysite.com/mypage.aspx?a=red&b=green&c=blue Pages in the application use ASP.net user controls and some of these controls build a query string. To prevent duplicate keys being created e.g. &pid=12&pid=10, I am researching methods of…

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• Tkinter mouse event initially triggered

  - by user3714884

  I'm currently learning Tkinter and I cannot find a solution for my problem here nor outside Stackoverflow. In a nutshell, all events that I bind to my widgets are triggered initialy and don't respond to my actions. In this example, the red rectangle appears on the canvas when I run the code, and…

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• How do I create static instances of a class inside that class?

  - by wehas

  I have a class Color that holds values for the red, green, and blue channels of a color. The class constructor lets you create a new color by specifying values for the three channels. However, for convenience, I would also like to have some "premade" colors available for the programmer. For…

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