Affine linear transformation of 2D objects
This functionality does not run in MATLAB.
obj2, …>, <
a = amin .. amax>,
plot::Transform2d(b, A, objects) with a vector b and
a matrix A applies
the affine linear transformation
The transformation matrix
A can be specified
by a list of lists
[[A1, 1, A1, 2,
…], [A2, 1, A2, 2,
with the sublists representing the rows.
A plain list
[A1, 1, A1, 2,
A2, 1, A2, 2]
represents the matrix row by row in 2D.
Transform objects can transform several graphical objects simultaneously. Plotting the transform object renders all graphical objects inside.
Transformation objects can be used inside transformation objects. If they are animated, the animations run simultaneously.
Animated transform objects are rather "cheap" concerning computing and storing costs. For more complex graphical objects, it is more efficient to use an animated transform object than to redefine the object for each frame.
to extract the graphical objects inside a transformation object.
|influence of objects on the |
|the number of frames in an animation|
|the name of a plot object (for browser and legend)|
|end value of the animation parameter|
|name of the animation parameter|
|initial value of the animation parameter|
|range of the animation parameter|
|end time of the animation|
|start time of the animation|
|the real time span of an animation|
We visualize a linear transformation without shift:
x1 := plot::Arrow2d([0, 0], [1/3, 1], Color = RGB::Red): x2 := plot::Arrow2d([0, 0], [1, 1], Color = RGB::Green): x3 := plot::Arrow2d([0, 0], [1, 1/3], Color = RGB::Blue): A := matrix([[1, -2], [-2, 1]]): plot(plot::Scene2d(x1, x2, x3), plot::Scene2d(plot::Transform2d(A, x1, x2, x3)), Scaling = Constrained, Layout = Horizontal):
delete x1, x2, x3, A:
For some applications, it is very popular to plot a function
in 3D together with a projection of its contour lines onto the lower
or upper bounding plane. MuPAD® has no direct option for this,
plot::Transform3d, it is possible to achieve
the same effect. Assume you have the function under consideration
f := plot::Function3d(sin(x*y)+cos(x^2-y), x=-3..3, y=-3..3, Submesh=[1,1]):
plot(plot::modify(f, ZContours = [Automatic, 10]))
To only get contour lines, we have to change a few more parameters:
We need to switch off the surface and the parameter lines. Then, we
add height coloring to our lines and use
plot::Transform3d to project them
onto the plane z = - 2.5.
Finally, we plot these lines together with the original function:
plot(f, plot::Transform3d([0, 0, -2.5], // shift vector [1, 0, 0, // transformation matrix 0, 1, 0, 0, 0, 0], plot::modify(f, Filled = FALSE, XLinesVisible = FALSE, YLinesVisible = FALSE, ZContours = [Automatic, 10], LineColorFunction = // height coloring ((x, y, z) -> [(z+2)/4, 0, (2-z)/4]))))
The 2D transformation matrix: a 2×2 matrix,
a 2×2 array,
a list of 2 lists, or a plain list with 4 entries. The entries must
be numerical values or arithmetical expressions of the animation
Plot objects of the appropriate dimension
Animation parameter, specified as