| shear |
(Number shx, Number shy) |
typedict.Matrix |
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Changes this matrix so that x-coordinates of points are shifted horizontally
by an amount that depends on their distance from the y-axis,
and y-coordinates of points are shifted vertically by an amount that depends
on their distance from the x-axis,
and returns this matrix to the caller.
The mathematical description of
shear
says it transforms the point
(x, y)
into
(x + shx*y, y + shy*x)
which means the new and old matrices map
(1, 1)
and
(1 + shx, 1 + shy)
into the same point.
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| Example: |
The program,
import yoix.*.*;
JFrame f = {
paint(Rectangle rect) {
graphics { // "named block"
gsave();
translate(144, 144);
shear(0, .5);
arc(0, 0, 72, 0, 180);
setrgbcolor(0, 0, 1);
fill();
moveto(0, 0);
lineto(72*3, 0);
moveto(0, 0);
lineto(0, 72*3);
setrgbcolor(1, 0, 0);
stroke();
grestore();
}
}
};
f.visible = TRUE;
defines a paint function in a frame that applies a sharing transformation,
fills a half circle centered at the origin with blue, and then draws short
line segments in red that represent the positive x and y axes.
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| Return: |
Matrix
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| See Also: |
concat,
concatmatrix,
currentmatrix,
dividematrix,
dtransform,
Graphics,
identmatrix,
idtransform,
initmatrix,
invertmatrix,
itransform,
maptopixel,
rotate,
scale,
setmatrix,
transform,
translate
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Yoix is a registered trademark of AT&T Inc.
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