Hello Mr./Miss:
I am using geotools to rendering my pngs,anything is ok except
that the PointPlacement(I wondering how <AnchorPoint> works.)I'm not
familiar with English,sorry about any grammar mistakes.
Here is my code:
===============
TextSymbolizer ts = builder.createTextSymbolizer();
ts.setLabel(ff.literal("B"));
p.setAnchorPoint(builder.createAnchorPoint(0.5,0.5));
p.setRotation(ff.property("rotation"));
ts.setLabelPlacement(p);
.....
=============================
And here is the explaination about <AnchorPoint> that I found from
02-070_Styled_layer_Descriptor_Implementation_Specification.pdf.(url=
https://portal.opengeospatial.org/files/?artifact_id=1188)
==========
The coordinates are given as tw o floating-point numbers in the AnchorPointX
and
AnchorPointY elements each with values between 0.0 and 1.0 inclusive. The
bounding
box of the label to be rendere d is considered to be in a coorindate space
from 0.0 (lower-left corner) to 1.0 (upper-right corner), and the anchor
position is specified as a point in
this space. The default point is X= 0, Y= 0.5 , which is at the middle
height of the left-hand side of the label. A system may choose different
anchor points to de-c onflict labels.
I think that x,y represent the percentage of width and height,for
example,if(x,y) = (0.0,0.5),the anchorpoint of label="AB" is as the red
point shows below:
[image: 内嵌图片 1]
When I add a rotation,the label will rotate around the anchorpoint.However
the result of my test program is not like this,it's odd and seems
irregular.x and y can be greater than 1, and negative.
Sorry about any troubles,I am in great need of your help.Thank you.
Any of your reply will be highly appreciated.
Best Regards,
zhengheng
<<1.png>>
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