gd_rotate

Rotate a GD image.

GD_ROTATE

NAME

gd_rotate - Rotates a GD image.

SYNOPSIS

gd_rotate (gdsrc:variable, gddst:variable, srcx:integer, srcy:integer, srcw:integer, srch:integer, dstx:integer,dsty:integer,dstw:integer,dsth:integer,angle:integer, transparent:"string", bgcolor:"string",pourc:float, truecolor:true|false);

DESCRIPTION

This function is used to rotate a GD image.

gd_rotate really creates a new image if gddst is not specified, so it returns the new GD structure. The old GD structure is still valid. gd_free must be call with this new GD structure.

pourc and dw,dh are mutually exclusive.

The srcX and srcY coordinates specify the upper left corner of the source area; however, the dstX and dstY coordinates specify the CENTER of the destination area. This important distinction is made because the rotated rectangle may may or may not be parallel to the X and Y axes. The destination coordinates may be floating point, as the center of the desired destination area may lie at the center of a pixel (0.5 pixels) rather than its upper left corner. The angle specified is an integer number of degrees, between 0 and 360, with 0 degrees causing no change, and counterclockwise rotation as the angle increases.

PARAMETERS

srcx,srcy: Initial coordinates in the source image.

srcw,srch: Width and Height or source image.

dstx,dsty: Initial coordinates in the destination image.

dstw,dsth: Width and Height in the destination image.

pourc: Resizes image width this pourcentage.

gdsrc: Variable must hold a return value from gd_new.

angle: Angle to rotate 0 to 360.

gddst: Variable must hold a returned value from gd_new. If this is not specified, a new image is created.

truecolor: truecolor, tells new() to create a truecolor GD::Image object. Truecolor images have 24 bits of color data (eight bits each in the red, green and blue channels respectively), allowing for precise photograph-quality color usage. If not specified, the image will use an 8-bit palette for compatibility with older versions of libgd.

transparent: Specifies transparent color. Transparent color can be specify as bgcolor to use the backgound color. A color is specified as "#XXXXX" or as "255,255,255". Note that JPEG images do not support transparency, so this setting has no effect when writing JPEG images.

bgcolor: Specifies background color. A color is specified as "#XXXXX" or as "255,255,255".

RETURN

A pointer to the new GD structure. Will be used in other functions.

MODULES

To use this module, you must specify the following in /usr/local/website/site.conf:

Module gd {
        Library : "/usr/local/lib/libsngd.so"
        Init : "sngd_init"
}

EXAMPLES

res=<{
        %include "/includes/gd.sn";
        remove("/html/images/rot1.jpg");
        remove("/html/images/rot2.jpg");
        imsrc=gd_new(filename:"/html/images/20130708-1944-londres.jpg",truecolor:true);
        imdst=gd_new(width:1000,height:1000,bgcolor:Blue,truecolor:true);
        gd_rotate(gdsrc:imsrc, gddst:imdst,srcx:400,srcy:400,srcw:800,srch:800,dstx:50,dsty:50,angle:45);
        gd_write(gd:imsrc,format:"jpg",filename:"/html/images/rot1.jpg");
        gd_write(gd:imdst,format:"jpg",filename:"/html/images/rot2.jpg",quality:100);
        gd_free(imsrc);
        gd_free(imdst);
        -e "/html/images/rot1.jpg"; -e "/html/images/rot2.jpg"; }>.), q(res=truetrue.),{asm=>"-a"});

AUTHOR

Written by Pierre Laplante and Caroline Laplante, <laplante@sednove.com>

MODIFICATIONS

1.0 2014-09-09 21:24:14 laplante@sednove.com

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