18c02-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 91 行

<?php
// First of all, create a function that will automatically make a
// dropshadowed box. give it the coordinates of the primary box
// and the offset that you want the drop to be.  It assumes lower right.
function i_filledrectangledropshadow($g, 
        $x1, $y1, $x2, $y2, 
        $drop, $color, $shcolor) {
    // First draw the shadow box offset appropriately
    imagefilledrectangle($g, $x1 + $drop, $y1 + $drop, 
        $x2 + $drop, $y2 + $drop, $shcolor);
    
    // Now the main box:
    imagefilledrectangle($g, $x1, $y1, $x2, $y2, $color); 
}

// Create a function similar to above, but that creates an outline rectangle
//  with the drop shadow.  A more normal looking drop shadow box.
function i_rectangledropshadow($g, 
        $x1, $y1, $x2, $y2, 
        $drop, $color, $shcolor, $border) {
    // Time to cheat a bit.  First call our previous function:
    i_filledrectangledropshadow($g, $x1, $y1, $x2, $y2, 
        $drop, $color, $shcolor);
    
    // Now draw a regular rectangle on top of it:
    imagerectangle($g, $x1, $y1, $x2, $y2, $border);
}

// A function to draw a filled rectangle with rounded corners:
// Just like drawing a rectangle, but also specify a radius for the corners.
function i_filledroundedrectangle($g, $x1, $y1, $x2, $y2, $color, $radius) {
    // We need to know the diameter too:
    $d = $radius * 2;
    
    // Going to cheat slightly to accomplish this.  First draw four circles
    //  at the corners of this box:
    imagefilledellipse($g, $x1 + $radius, $y1 + $radius, $d, $d, $color);
    imagefilledellipse($g, $x2 - $radius, $y1 + $radius, $d, $d, $color);
    imagefilledellipse($g, $x1 + $radius, $y2 - $radius, $d, $d, $color);
    imagefilledellipse($g, $x2 - $radius, $y2 - $radius, $d, $d, $color);
    
    // Now fill in the middle, two well placed rectangles will do it.
    imagefilledrectangle($g, $x1+$radius, $y1, $x2-$radius, $y2, $color);
    imagefilledrectangle($g, $x1, $y1+$radius, $x2, $y2-$radius, $color);
}

// Now a version that will just draw an online of a rounded rectangle
function i_roundedrectangle($g, 
        $x1, $y1, $x2, $y2, 
        $color, $border, $radius) {
    // This could be implemented by doing calls of imagearc and imageline
    //  similar to the previous function.  But since we have that function
    //  we can cheat:  
    // Just call it twice with the inner color, and the border.
    i_filledroundedrectangle($g, $x1, $y1, $x2, $y2, $border, $radius);
    i_filledroundedrectangle($g, $x1 + 1, $y1 + 1, $x2 - 1, $y2 - 1, 
        $color, $radius);
}

// We are going to call each of these to test them.
// Create a blank image to do this on.
$gfx = imagecreatetruecolor(200, 200);

// Declare a few colors we will use:
$black = imagecolorallocate($gfx, 0, 0, 0);
$gray = imagecolorallocate($gfx, 120, 120, 120);
$white = imagecolorallocate($gfx, 255, 255, 255);
$blue = imagecolorallocate($gfx, 0, 0, 255);

// Make almost entire background white.
imagefilledrectangle($gfx, 1, 1, 198, 198, $white);

// Turn on antialiasing so that curvy things look better.
imageantialias($gfx, true);

// Ok, try to make a blue box with a gray drop shadow:
i_filledrectangledropshadow($gfx, 5, 5, 50, 40, 5, $blue, $gray);

// How about a basic white box, with black outline, with a drop shadow
i_rectangledropshadow($gfx, 5, 60, 50, 100, 5, $white, $gray, $black);

// Insert a filled rounded rectangle, blue sounds good
i_filledroundedrectangle($gfx, 70, 5, 150, 50, $blue, 15);

// Now how about a rectangle with rounded corners, not filled in:
i_roundedrectangle($gfx, 70, 65, 160, 100, $white, $black, 15);

// Output our sample as a PNG
header('Content-type: image/png');
imagepng($gfx);
?>