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Because we are dealing with a graphical topic, the concept of what color to display it in is a rather important one. As mentioned, colors for dynamic imaging are handled in an RGB method. To apply colors to a particular element of a dynamic image, you must first allocate the color to a variable resource that can then be used on other image elements. You use the imagecolorallocate() function to facilitate this necessity. The following example shows how to start using the new colors to create a title for the graph.

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//blittable type - out public void IntOut(int paramA, out int paramB) { paramB = paramA; } //reference type - by value public void StringsInOnly(string paramA, string paramB) { paramB = paramA; } //reference type - by value, with out attribute public void StringsInAndOut(string paramA, string paramB) { paramB = paramA; } //reference type - by ref public void StringsByRef(string paramA, ref string paramB) { paramB = paramA; } //reference type - by ref, with in attribute public void StringsByRefInOnly( string paramA, ref string paramB) { paramB = paramA; } //reference type - out public void StringsOut(string paramA, out string paramB) { paramB = paramA; } //value type - by value public void DateTimeInOnly( DateTime paramA, DateTime paramB) { paramB = paramA; } //value type - by value, with out attribute public void DateTimeInAndOut( DateTime paramA, DateTime paramB) { paramB = paramA; } //value type - by ref public void DateTimeByRef(

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< php //sample8_5.php //The first thing you do is check for GD compatibility. try { //First you create a blank canvas. if ($animage = imagecreate (500, 500)){ //Now, let's allocate the background color and line color. //Here is the way to do it with RGB. $white = imagecolorallocate ($animage, 255, 255, 255); //And here is an example with hex. $black = imagecolorallocate ($animage, 0x00, 0x00, 0x00); //Now, let's draw the rectangle over the background, and surround //it with a black line. imagefilledrectangle ($animage, 0, 0, 500, 500, $black); imagefilledrectangle ($animage, 1, 1, 498, 498, $white); //Now, let's create some more colors for the title. $blue = imagecolorallocate ($animage, 0, 0, 255); $green = imagecolorallocate ($animage, 0, 255, 0); //Now, let's center the text at the top of the image. $title = "A Sample Poll"; imagestring ($animage, 4, ((500 - (strlen($title) * imagefontwidth(4))) / 2) , 5, $title, $blue); $copy = "Copyright Lee Babin"; imagestring ($animage, 4, ((500 - (strlen($copy) * imagefontwidth(4))) / 2) , 25, $copy, $green); //Designate the image. imagepng ($animage); //Then output it. header ("Content-type: image/png"); //Lastly, clean up. imagedestroy ($animage); } else { throw new exception ("Sorry, the GD library may not be setup."); } } catch (exception $e) { echo $e->getmessage(); } >

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DateTime paramA, ref DateTime paramB) { paramB = paramA; } //value type - by ref, with in attribute public void DateTimeByRefInOnly( DateTime paramA, ref DateTime paramB) { paramB = paramA; } //value type - out public void DateTimeOut( DateTime paramA, out DateTime paramB) { paramB = paramA; } } All of the methods work the same way, assigning the value from the first parameter to the second. The purpose of this test class is to see which methods actually return the changed parameter value to the caller.

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As you can see in this example, you are beginning to turn the little graphing system into a more cohesive image. By using some green and blue color allocations, the image is starting to obtain some style. Keep in mind that you can use hex values or numerical values when setting up color allocations, so use what is most efficient for your project. Also note how easy it is to center text. By using the function imagefontwidth(), you can determine how long each character will be using the current font. By using a little math, you can easily determine where the X coordinate should begin in order to allow the text to sit squarely in the middle, regardless of what that text may be. Figure 8-5 shows some output of recipe 8-5.

Table X-1. Firebird 1.5.0 Error Codes (continued)

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