NAME
Imager::Fill - general fill typesSYNOPSIS
use Imager;
use Imager::Fill;
my $fill1 = Imager::Fill->new(solid=>$color, combine=>$combine);
my $fill2 = Imager::Fill->new(hatch=>'vline2', fg=>$color1, bg=>$color2,
dx=>$dx, dy=>$dy);
my $fill3 = Imager::Fill->new(fountain=>$type, ...);
my $fill4 = Imager::Fill->new(image=>$img, ...);
my $fill5 = Imager::Fill->new(type => "opacity", other => $fill,
opacity => ...);DESCRIPTION
Creates fill objects for use by most filled area drawing functions.
All fills are created with the new method.
- new
-
my $fill = Imager::Fill->new(...);The parameters depend on the type of fill being created. See below for details.
The currently available fills are:
solid
hatch
fountain (similar to gradients in paint software)
image - fill with an image, possibly transformed
opacity - a lower opacity version of some other fill
Common options
- combine
-
The way in which the fill data is combined with the underlying image. See "Combine Types" in Imager::Draw.
In general colors can be specified as Imager::Color or Imager::Color::Float objects. The fill object will typically store both types and convert from one to the other. If a fill takes 2 color objects they should have the same type.
Solid fills
my $fill = Imager::Fill->new(solid=>$color, combine =>$combine)Creates a solid fill, the only required parameter is solid which should be the color to fill with.
A translucent red fill:
my $red = Imager::Fill->new(solid => "FF000080", combine => "normal");Hatched fills
my $fill = Imager::Fill->new(hatch=>$type, fg=>$fgcolor, bg=>$bgcolor,
dx=>$dx, $dy=>$dy);Creates a hatched fill. You can specify the following keywords:
hatch- The type of hatch to perform, this can either be the numeric index of the hatch (not recommended), the symbolic name of the hatch, or an array of 8 integers which specify the pattern of the hatch.Hatches are represented as cells 8x8 arrays of bits, which limits their complexity.
Current hatch names are:
check1x1,check2x2,check4x4- checkerboards at various sizesvline1,vline2,vline4- 1, 2, or 4 vertical lines per cellhline1,hline2,hline4- 1, 2, or 4 horizontal lines per cellslash1,slash2- 1 or 2 / lines per cell.slosh1,slosh2- 1 or 2 \ lines per cellgrid1,grid2,grid4- 1, 2, or 4 vertical and horizontal lines per celldots1,dots4,dots16- 1, 4 or 16 dots per cellstipple,stipple2- see the samplesweave- I hope this one is obvious.cross1,cross2- 2 densities of crosshatchvlozenge,hlozenge- something like lozenge tilesscalesdown,scalesup,scalesleft,scalesright- Vaguely like fish scales in each direction.tile_L- L-shaped tiles
fg,bg- Thefgcolor is rendered where bits are set in the hatch, and thebgwhere they are clear. If you use a transparentfgorbg, and set combine, you can overlay the hatch onto an existing image.fgdefaults to black,bgto white.dx,dy- An offset into the hatch cell. Both default to zero.
A blue and white 4-pixel check pattern:
my $fill = Imager::Fill->new(hatch => "check2x2", fg => "blue");You can call Imager::Fill->hatches for a list of hatch names.
Fountain fills
my $fill = Imager::Fill->new(fountain=>$ftype,
xa=>$xa, ya=>$ya, xb=>$xb, yb=>$yb,
segments=>$segments, repeat=>$repeat, combine=>$combine,
super_sample=>$super_sample, ssample_param=>$ssample_param);This fills the given region with a fountain fill. This is exactly the same fill as the fountain filter, but is restricted to the shape you are drawing, and the fountain parameter supplies the fill type, and is required.
A radial fill from white to transparent centered on (50, 50) with a 50 pixel radius:
use Imager::Fountain;
my $segs = Imager::Fountain->simple(colors => [ "FFFFFF", "FFFFFF00" ],
positions => [ 0, 1 ]);
my $fill = Imager::Fill->new(fountain => "radial", segments => $segs,
xa => 50, ya => 50, xb => 0, yb => 50,
combine => "normal");Image Fills
my $fill = Imager::Fill->new(image=>$src, xoff=>$xoff, yoff=>$yoff,
matrix=>$matrix, combine => $combine);Fills the given image with a tiled version of the given image. The first non-zero value of xoff or yoff will provide an offset along the given axis between rows or columns of tiles respectively.
The matrix parameter performs a co-ordinate transformation from the co-ordinates in the target image to the fill image co-ordinates. Linear interpolation is used to determine the fill pixel. You can use the Imager::Matrix2d class to create transformation matrices.
The matrix parameter will significantly slow down the fill.
# some image to act as a texture
my $txim = Imager->new(...);
# simple tiling
my $fill = Imager::Fill->new(image => $txim);
# tile with a vertical offset
my $fill = Imager::Fill->new(image => $txim, yoff => 10);
# tile with a horizontal offset
my $fill = Imager::Fill->new(image => $txim, xoff => 10);
# rotated
use Imager::Matrix2d;
my $fill = Imager::Fill->new(image => $txim,
matrix => Imager::Matrix2d->rotate(degrees => 20));Opacity modification fill
my $fill = Imager::Fill->new(type => "opacity",
other => $fill, opacity => 0.25);This can be used to make a fill that is a more translucent or opaque version of an existing fill. This is intended for use where you receive a fill object as a parameter and need to change the opacity.
Parameters:
type => "opacity" - Required
other - the fill to produce a modified version of. This must be an Imager::Fill object. Required.
opacity - multiplier for the source fill opacity. Default: 0.5.
The source fills combine mode is used.
my $hatch = Imager::Fill->new(hatch => "check4x4", combine => "normal");
my $fill = Imager::Fill->new(type => "opacity", other => $hatch);OTHER METHODS
- Imager::Fill->hatches
-
A list of all defined hatch names.
- Imager::Fill->combines
-
A list of all combine types.
FUTURE PLANS
I'm planning on adding the following types of fills:
checkerboard- combines 2 other fills in a checkerboardcombine- combines 2 other fills using the levels of an imageregmach- uses the transform2() register machine to create fills
AUTHOR
Tony Cook <tony@develop-help.com>
SEE ALSO
Imager(3)