Augmented Reality Control of the Telerobot 2003
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- Colour
- Module 7: Cursors
- 7.2 Design and Implementation
- 7.3 Testing
- 7.4 Future Work
- 7.5 Final Specification
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The remaining vis are concerned with drawing, as such we found it convenient to define a colour palate that could be changed in one place, to completely change the colour scheme used. In order to achieve this we defined a .ctl file as shown below. 
Figure 42
Figure 43 This vi draws an active prism, this is defined as being a prism that can have a possible 3 colours, has control points and has translation lines, however the control points and translation lines are drawn by other vis.
Figure 44 This vi draws a non active 2D prism, including greying of back lines. The prism can have a total of 2 colours, controlled by the “Selected” Boolean input
Figure 45 This draws the translation lines for an active RP.
Figure 46 This vi draws the control points of a 2D prism, they are drawn as discussed in section 6.2.7.2 above.
Module 7: Cursors7.1Initial SpecificationThe action performed or about to be performed by a mouse click needs to be conveyed to the user through the use of cursors other than the standard labView cursor, the hand. These cursors should become active when over control points, control points are discussed in module 6 AR graphics. The cursors should indicate the use of the control point, so if the mouse is over a rotation control point then something to do with rotation should be shown. 7.2 Design and Implementation7.2.1 Cursor Types A number of different cursors are needed to be able too meet the specification. There needs to be cursors for each different type of control point as well as a general cursor. In addition we also created cursors that differ slightly between when the mouse is up to when the mouse is down. We called these cursors passive and active cursors respectively, and their pictures differ in file name by the presence of a capital A at the end. 7.2.1.1 Select Cursor Figure 47 This cursor is used when a prism wire frame has the mouse over the geometric centre to indicate that the RP wire frame under the cursor will become selected if the mouse is clicked. There is no active version of this cursor 7.2.1.2 Rotate Cursor 
Figure 48 This cursor is used to when a rotation point is highlighted and selected 7.2.1.3 X & Y position cursor 
Figure 49 This cursor is used when the RPs bottom centre control point is selected or highlighted, it indicates translation in the x & y dimensions simultaneously 7.2.1.4 Directional Manipulation There are a number of arrows that are used to indicate both translation and stretching. However, due to the limited nature of the cursors, they do not rotate in every direction imaginable, just horizontal, vertical and 45 degree diagonal in both directions (see below), there is a need to be to ale to determine which directional arrow to use based on the situation. Height is simple, as it will always stretch vertically up we use the updown arrow. Translation lines are also simple, as they will only use the horizontal and vertical arrows depending on the direction of translation. But the length and width control points will used varied cursors depending upon the orientation of the RP wire frame. The simple way to determine which cursor to use is to look at the control points in 2D. We then need to calculate the angle that the line adjoining the control point of interest and the rotation control point, makes with the horizontal (x) axis. We call this angle  .
For:
 and  use cursor: leftright
 use cursor: TRBL
 use cursor: updown
 use cursor: TRBL
Where is measured as shown below.
Figure 50 And the cursors are defined as follows. 
Figure 51 Note: that TLBR is an abbreviation for top left bottom right, and TRBL is an abbreviation for top right bottom left, which refer to the direction that the corners that the cursor extends from and to. 7.3 TestingThe code which changes the cursor was taken off the Internet from the National instruments web site, it is supported and tested by National Instruments Applications Engineers. The code is available from http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3E79356A4E034080020E74861&p_node=DZ53008&p_submitted=N&p_rank=&p_answer=&p_source=External As such the only code that required extensive testing by us was the code that determines the angle between the rotation point and the control point of interest. Here are some of the results:
* Note: for the purposes of assigning cursors and also as far as a horizontal line is concerned then 0deg and 180 deg are equivalent. 7.4 Future WorkWe have implemented the cursors using discrete positions, and with a very course resolution,6 per  . It would be nice to increase this resolution or to find some way of having a continuous, or at least continuous appearing, way of defining the cursors based the orientation of the prism.
We have also grouped the actions of translating and stretching the prism into the same categories using the same cursors for each action. A different cursor to indicate the different actions would be desirable, we attempted to implement this but were not able to come up with a meaningful representation to distinguish between the two actions in the time. 7.5 Final SpecificationThe only design change is that mentioned above in Future Work, which was that we didn’t distinguish between the different actions of translation and scaling. This is however, a minor design change and doesn’t appear to affect the usability of the system at all. Directory: Information Information -> Management and Marketing Information -> Computer Science 101 October 13, 2016 Information -> Student athlete handbook Information -> Table of Contents Page Information -> Policies and Procedures 40 – Eligibility Information -> Procedures for Implementing and Managing the All-University Policy on Mobile Communication and Information Devices (Mobile cids) Policy University of Kansas Medical Center Information -> Policies and Procedures 40 – Eligibility Information -> Cacc director’s council may 24-25 2010 12 noon caesar’s, Atlantic City, nj Download 6.79 Mb. Share with your friends:
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