# Welcome Back

Hello all,

It has been a long time. I took a break from KoebeLib to research another problem and now I am back! Man, oh man, has it been a long time and I am happy to let you know that a lot has been done since my last post. We are well past our way of selecting circles. The selection of circles then allowed us to create more sophisticated tools. Current functionality includes: calculating the intersection of two circles, given two disks and a point the member of the coaxial family through that point is calculated, and we have delete functionality! Below a picture has been included to show you what the current button panel looks like when it is first run. The current in progress tools are given two disks and a point calculate the disk of the orthogonal family. We initially thought that we could use the conical caps to calculate, however, this did not work. Our next thought is that we calculate the plane orthogonal to the given two disks and this will be relatively simple because we had to do something similar for the member of the coaxial family. We have code written for given three disks return a c-plane but there is not currently a button for it because we aren’t quite sure as to how to represent c-planes. On the flip side another tool in progress is given three c-planes return a disk. For this to be completed I just have to write the calculation to select a plane. These two tools will not require too much work and as a result I have a couple more (simple) things in progress. Currently our button panel is not responsive so that is first on my todo list. We also want a side panel that displays the current drawn objects and want functionality to be able to select multiple objects. I will see you all with more tools completed for KoebeLib.

Until then,

# Student Post: Circle Selection

For the past week or so I was tasked with allowing the user to select a circle and then change the color of the circle when selected. Similarly when a point is a selected, change its color as well. In order to select a circle I calculated if there was a ray-plane intersection. I was able to use the ray-plane intersection because our circles are stored as a plane with the coefficients of the equation of the plane. I was able to get the selection of a circle correct. However, I have been unable to change the color of the circle and point. Originally when we were drawing our objects we looped over a list that contained them all and pulled the style from that list. I think the current issue is that I am not setting the style of the point/circle correctly so when the objects are being drawn as opposed to using the style of the node it is using the default style from the list. I believe that this will be an easy fix.

Until next week.

# Student Post: Streamlining the Tools

This week I was tasked with trying to ‘highlight’ a circle if selected. Currently, I am struggling with how to calculate the intersection if a user selects an edge because a disk has three incoming edges in which the other endpoint is a point and thus was not able to complete this task. However, I was able to streamline some of the code for the tools that are currently available. Last week I added buttons to the screen which allowed the user to click on which tool they wanted as opposed to using the keyboard. However, in order to draw a circle the letter ‘C’ still needed to be clicked. One issue that I encountered with still using the key for the circle tool was that it changed the point editing tool to the circle tool indefinitely which resulted in no longer being able to drag points. Now the circle tool is a subclass of the point editing tool. The two different buttons for point and circle switch between the tool and thus we have returned to our functionality below I have included a picture of what the current tool bar looks like.  Next week, I will have it so when I user selects a circle it will change colors and also that when the user selects a point those will change a color before an object is drawn with them.

Until then,

This week and the previous week I was tasked with adding buttons to our user interface. Currently when the buttons A, P, or C were clicked it selected a certain “tool” that you could use. This week I was attempting to create buttons so that instead of having to click a keyboard key the user could click a button. I was able to create buttons, however, I unintentionally over wrote the frame for the Python Interpreter so the buttons are on the wrong screen. I believe that this will be a quick fix and that all I need to do is create a new content pane and add that to the frame with the arcball because currently it is adding buttons to the content pane of the python interpreter. A picture of the issue is included below. The reason we are making this change is because as we add more features the use of keyboard keys would become too extensive. That is all for this week.

Until next week,

# A Student Post: An Interactive Application for (Inversive) Geometry Of Circles

Hello,

For the past several months I have been working an interactive interface for the construction of inversive geometry of circles. Currently the working features are adding points, dragging points, and selecting three points to draw a disk. The past few weeks I was tasked with altering the code in order to implement a construction graph for the objects that were being drawn. Once completed this alteration will update any object if what it is composed of is changed. For example, a disk is composed of 3 points with the construction graph when one of the points is moved the disk updates accordingly.

Currently in order to utilize the features such as adding a point or drawing a disk I am using keyboard commands (P : point editor mode, C : to draw a disk, A : to move the arcball). As the interface acquires more features the addition of more keyboard commands will become inconvenient to remember all of the keyboard keys and thus currently I am attempting to add buttons to the screen so those can be clicked as opposed to a keyboard key being selected.

Until next week,