Using the Triangle Viewport
Using either the mouse or trackpad, the graphical Triangle viewport can be used to modify the selected matrix's values (shown as a triangle).
The triangle is a convenient way of showing the selected matrix's parameter values and allowing you to easily modify its values
Viewing either one or all triangles at once
In the Triangle editing options panel, click either the Selected or All position of the Which Transform switch.
Selecting which triangle to view/edit
- Click on one of the rows in the Transform list.
- Change the viewport to view all triangles and click on a different triangle.
after clicking
Note: if several transforms share the same triangle setting, only one them can be selected this way.
Changing Viewport Zoom Magnification
If the triangles are either too small or too big to work with, the zoom magnification can be adjusted by:
- Rolling the middle mouse wheel forward/backward to zoom out/in.
- Drag two fingers up/down on the trackpad to zoom out/in.
For example:
to
Moving (translation of) the Triangle
Move the mouse inside a triangle until the hand cursor is visible. Click-drag the triangle to another location.
Rotating the Triangle
Move the mouse over either a blue or red line a triangle until the rotation cursor is visible. Click-drag to enlarge/shrink the triangle .
Shrinking/expanding (scaling of) the Triangle
Move the mouse to the triangle opposite the endpoint having a black square until the zoom cursor is visible. Click-drag the triangle to another location.
Adjusting location of just one of the Triangle's endpoints
Move the mouse to the triangle over a triangle endpoint until the tranlate cursor is visible. Click-drag the endpoint to another location.
