Actions with the mouse and buttons



The DTVD user interface is mainly operated by the mouse. You usually look for the required actions via the icons in the drop-down menu on the left and then left-click these to activate the function. The icon is then highlighted in orange or a dialog appears requesting you to enter further details. A draw function remains activated until you deactivate it with the right mouse button within the viewport. The icon then returns to its original color.

Procedure using the 'Create line ' function as an example:

Left-click the line icon in the 'Create&edit ' tab in the drop-down menu on the left. The icon turns orange, the draw function has been activated. Now left-click the position in the diagram where you want to start drawing the line. If you have released the left mouse button, the line attaches itself to the cursor. Now left-click the position where the line is to end and the line is completed. Alternatively, you can keep the mouse button pressed down and move the mouse to the target point whilst holding down the button and then let go of the mouse button; the line is then completed.

The 'Create line ' function remains activated which you can see from the fact that the icon is still highlighted in orange or by the displayed crosshairs. You can now draw one line after the other. Please also note the lock functions. If you want to close the  'Create line ' function, then click the right mouse button. The icon turns back to its original color - is thus inactive. You can watch the procedure in this video.

Even the right mouse button has many functions for working on your distance-time diagram. The window in TDVD always only reveals a section of the coordinate system. In the course of your calculations, parts of your presentations may wander out of the window. Of course, you can correct this via the scale functions, but also by moving the visible section with the right mouse button. To do this, press the right mouse button and hold it like that in the window and correct the visible area by moving the mouse at the same time. After it is in position, then let the mouse button go. By the way, you can check the actual visible area according to your choice of paper size and position under Print preview.

By simply pressing the right mouse button, you fade in a context menu that offers further, diverse processing functions. These will be explained below.

As a standard, the reference point for all calculations and coordinate input is in the starting point of the coordinates. You can, however, position the reference point elsewhere by right-clicking the 'Set reference point ' function in the context menu. Should you require a reference point for individual actions only for the likes of adding further elements, you can also realise this alternatively for the  'Create mark ' function.



A piece of transparent paper is positioned over the coordinate system by means of which you can check which elements and components of your distance-time diagram will be printed out later by the printer. You select the paper size within the physical possibilities of your printer according to your requirements, whereby you additionally determine whether the diagram is to be printed in portrait or landscape format. You can set the exact contents to be printed by moving the paper over the coordinate system. To do this, select the 'Position paper ' function from the context menu or the corresponding function under 'Settings' from the drop-down menu on the left . In addition, you can check the full print-out again under 'Print preview'. The procedure of positioning the paper is shown briefly in this video.



Should you have made a mistake during an action or change, then there's no need for panic. Right-click the  'Redo ' function in the context menu to reset to the old state or reconstruct previous changes with the  'Undo ' function.


If you move the cursor in the context menu on to 'Zoom ', a further sub-menu is displayed. Various types of zoom can be found in this sub-menu. When selecting  'Zoom in ' or 'Zoom out ', the current section of the image is enlarged or decreased by factor 2.  With 'Zoom to paper, ' the section is made to match the currently selected paper size to an optimum. If you want to display the elements currently placed in your drawing at a maximum size in the window, select 'Zoom to all '. All zoom functions are recorded with undo/redo tracking so that you can return to the last view or reset an already delselected view with the options  'Undo ' or 'Redo '

With the presets, all zoom processes are performed in relation to the starting point of the coordinates. This ensures that the current view, apart from the change in size, does not wander out of the window. Alternatively, you can changes this setting by deselecting  'Zoom relative to origin '. The zoom steps are then performed relative to the center of the image.


Here you can set various snaps. When positioning new objects, you can position them wherever you want to in the diagram. Sometimes, new drawing elements have to be positioned very precisely relative to those already positioned. If the 'Snap/To Objects ' function is ticked, 'snap points' will be offered to you when moving the mouse over other objects and displayed with a blue triangle. If you click the left mouse button when there is a visible blue triangle, your new drawing element will be attached to exactly this point. Sometimes there are several objects in the area directly surrounding the points of focus. In that case, a circle is displayed instead of a blue triangle. Press the left mouse button and move over the elements in question to be highlighted with the cursor. Then click on the desired object and your new drawing element will be attached to it. You can look at this procedure in this video.

Should you want to position new elements on the intersections of the displayed grid, then tick the 'To grid ' box. the widths of the grid can be set under 'Settings' in the 'Paper setup ' function. Select 'Orthogonally ' if you want to add vertical or horizontal lines or arrows, for example.

You can check the current settings of the snap at any time via the display at the bottom right of the browser window at any time without having to call up the context menu. You can also make changes by clicking directly on the corresponding icon (even during the drawing process), whereby the respective icon turns orange when it is active.


Finally, a right-click in the context menu will reveal the 'Display ' box, which in turn displays a sub-menu. Here you can select or deslect various display options such as whether the coordinate axes, the grid or the transparent paper is displayed. If you add  new object now, besides the coordinate display, an ornage cross is displayed for orientation purposes which reaches out to the edges of the window. If you deselect  'Large cross ', a small cross about the size of the cursor is displayed. 

There are scrollbars arranged around the window with wich you can move the drawing area step by step. If you would particularly prefer to use the area covered by the scrollbars as the visible area for your distance-time diagram on a small monitor, deselect the 'Scrollbars ' function and they will disappear. You can just as easily move the window by holding down the right mouse button to wherever you want.

The last menu item activates the Print preview. All parts of the drawing that exceed the selected paper format are cut off and the coodinate system, as it was set (labeling on the inside or outside) is displayed. This means, exactly how it will be printed out later on. You can access this setting by clicking on the 'Print ' tab in the drop-down menu on the left.