| showimage |
(Image image [, Matrix mtx] [, double alpha]) |
typedict.Graphics |
| |
Draws
image
on
drawable
at the current point, which is then adjusted based on the
metrics
defined in
image.
A transformation specified by the optional
mtx
argument can be applied as the
image
as it is painted on
drawable
using the optional
alpha
argument, which should be a number between
0.0
and
1.0,
as the alpha value.
Omitting
alpha
or supplying a value of
1.0
are equivalent.
showimage
aborts with a
nocurrentpoint
error if
path
is empty.
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| Example: |
The program,
import yoix.*.*;
Image img = {
String source = "http://www.yoix.org/imgs/ATTlogo.gif";
Array metrics = {.5, -1.0, 1.0, .25};
};
JFrame f = {
Color background = Color.black;
paint(Rectangle r) {
graphics { // "named block"
gsave();
rectclip(r);
recterase(r);
translate(72, 72);
rotate(15);
setrgbcolor(1, 0, 0);
linewidth = 2;
moveto(72, 72);
rlineto(300, 0);
moveto(72, 72);
rlineto(0, 300);
stroke();
moveto(72, 72);
showimage(img, .5);
showimage(img, .7);
showimage(img, .9);
grestore();
}
}
};
f.visible = TRUE;
uses
showimage
to draw an image several times in a simple rotated coordinate system
using different alpha values.
Much of what happens is controlled by the
metrics
array defined in
img
(see
Image
for more details).
In this example the first two numbers in
metrics
are x and y side bearings that determine where the image's upper left
corner goes relative to the current point.
The last two numbers in
metrics
are x and y widths that are added to the current point after the image
is drawn.
The four
metrics
values are multiplied by the image's width and height to get the actual
numbers that are used.
| | |
| Return: |
none
| | |
| See Also: |
ashow,
awidthshow,
charpath,
imagepath,
kshow,
show,
stringadvance,
stringbounds,
stringwidth,
widthshow
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Yoix is a registered trademark of AT&T Intellectual Property.
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