14 Jun 2020 03:26:02 UTC
- Distribution: Imager
- Module version: 1.013
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Imager::Fill - general fill types
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 => ...);
Creates fill objects for use by most filled area drawing functions.
All fills are created with the new method.
my $fill = Imager::Fill->new(...);
The parameters depend on the type of fill being created. See below for details.
The currently available fills are:
fountain (similar to gradients in paint software)
image - fill with an image, possibly transformed
opacity - a lower opacity version of some other fill
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.
my $fill = Imager::Fill->new(solid=>$color, combine =>$combine)
Creates a solid fill, the only required parameter is
solidwhich should be the color to fill with.
A translucent red fill:
my $red = Imager::Fill->new(solid => "FF000080", combine => "normal");
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:
check4x4- checkerboards at various sizes
vline4- 1, 2, or 4 vertical lines per cell
hline4- 1, 2, or 4 horizontal lines per cell
slash2- 1 or 2 / lines per cell.
slosh2- 1 or 2 \ lines per cell
grid4- 1, 2, or 4 vertical and horizontal lines per cell
dots16- 1, 4 or 16 dots per cell
stipple2- see the samples
weave- I hope this one is obvious.
cross2- 2 densities of crosshatch
hlozenge- something like lozenge tiles
scalesright- Vaguely like fish scales in each direction.
tile_L- L-shaped tiles
fgcolor is rendered where bits are set in the hatch, and the
bgwhere they are clear. If you use a transparent
bg, and set combine, you can overlay the hatch onto an existing image.
fgdefaults to black,
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.
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
fountainfilter, 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");
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
yoffwill 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));
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.
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);
A list of all defined hatch names.
A list of all combine types.
I'm planning on adding the following types of fills:
checkerboard- combines 2 other fills in a checkerboard
combine- combines 2 other fills using the levels of an image
regmach- uses the transform2() register machine to create fills
Tony Cook <email@example.com>