Is there a way to force Visio to draw an arrowhead at the point where a line intersects a connected shape?
I.e. custom connection points are super inconvenient as they never seem to be where you need them, especially if you are still moving shapes around trying to get the right arrangement. Instead I would like to connect shapes using a line attached to each shape's center point and have Visio draw the arrowheads where the line intersects the connected shape. Is this possible?
Which version of Visio are you using?
What you describe is the standard behaviour for Visio. Visio connects to the connection points around the edge. The connection will highligt in red to indicate where it connects. If the entire shape highligts red then the connection point will be the nearest point in the direction ofthe other shape. So rather than connect to a fixed point, the point will move depending where the other shape is.
Related
I am improving a video game of mine where I currently have the problem that NPCs can shoot through walls. In order to fix this issue, I have decided to completely re-do my work regarding ground combat.
I use a tight grid for finding paths from any point A to B. I store my grid as an image-like structure and use Jump Point Search for the pathfinding itself. My goal is to find a location that is as far away from the enemy as possible (limited by the firearms's range) that also has a direct line of sight to the enemy.
In my latest approach, I determined all nodes in my grid that are within weapon range and that are connected to the enemy's location (colored in green in the image below). The final missing part is filtering these points so that only the points with a valid line of sight remain.
I can also detect the border lines (colored in blue) very fast. I could check for every node, if a line from this node to the enemy would intersect any border line. If that is not the case, I have clear line of sight. However, I assume this to be neither fast nor the optimal solution.
Do you have any ideas or suggestions? I am glad for any hint!
I visualized the grid in the following image to give you an idea of what I am talking about. If a character would stand in the lower right green area, he could not shoot the enemy in the upper left area because of missing line of sight.
I have a drawing feature where, as in one case, a person can draw a circle using the methodology in OL docs example. When that's saved, the server needed to be have it converted to a polygon, and I was able to do that using fromCircle.
Now, I'm needing to make the circle modifiable after it's been converted and saved. But I don't see a clear cut way to get a Circle geometry out of the Polygon tools provided in the library. There is a Polygon.circular, but that doesn't sound like what I want.
I'm guessing the only way to do this is to grab the center, and one of the segment points, and figure out the radius manually?
As long as fromCircle used sides set to a multiple of 4 and rotation zero (which are the default) center and radius can be easily obtained to convert back to a circle:
center = ol.extent.getCenter(polygon.getExtent());
radius = ol.extent.getWidth(polygon.getExtent())/2;
I have tried to find any information on how the Unity assigns pivot points to object but all I keep finding is threads on how to move pivot points and that it can't be done. I am creating a 2D game with a background that is randomly created with meshes that are wrapped in empty GameObjects. These objects are organically shaped but they have a property that returns a rectangle that bounds the object so that they can be placed in a way that they are not overlapping. The trouble is that the algorithm assumes that the pivot point is going to be the center of the object. What I would like to know is how does Unity decide where the pivot point will be set to so that I can predict how much I will need to move my mesh inside the parent object so that the pivot point will be in the center of the bounding rectangle.
Possible fix:
Try create the meshes during runtime and see if it always places the pivot points at a certain corner or at least relatively speaking the same location.
If it does that you would know where the pivot point is and could take it into account in your code, if you also know the size of the mesh you spawn.
So I think most general and correct answer that I can come up with is that unity assigns the pivot point to the center of the GameObject that you apply the Mesh to. The local coordinates of the vertices of the mesh depending on how you create them mighht place your mesh so that its logical center is not the same as the that of the empty GameObject that it is attached to. What I did to fix the issue was to make a vector from local point (0,0,0) to the center of bounding rectangle and translate the vertices I use to make my mesh by that vector inverted. It wasn't perfect but by far close enough to ensure that I won't have any overlapping meshes.
I am able to draw shapes using the UIBezierPath object. Now I want to identify different shapes drawn using this eg. Rectangle , Square , Triangle , Circle etc. Then next thing I want to do is that user should be able to select a particular shape and should be able to move the whole shape to different location on the screen. The actual requirement is even more complex , but If I could make this much then I can work out on the rest.
Any suggestion or links or points on how do I start with this is welcome . I am thinking of writing a separate view to handle every shape but not getting how do I do that..
Thank You all in advance !!
I recommend David Gelphman’s Programming with Quartz.
In his chapter “Drawing with Paths” he has a section on “Path Construction Primitives” which provides a crossroads:
If you use CGContextAddLineToPoint your user could make straight lines defined by known Cartesian points. You would use basic math to deduce the geometric shapes defined by those points.
If you use CGContextAddCurveToPoint your user could make curved lines defined by known points, and I’m pretty sure that those lines would run through the points, so you could still use basic math to determine at least an approximation of the types of shapes formed.
But if you use CGContextAddQuadCurveToPoint, the points define a framework outside of the drawn curve. You’d need more advanced math to determine the shapes formed by curves along tangents.
Gelphman also discusses “Path Utility Functions,” like getting a bounding box and checking whether a given point is inside the path.
As for moving the completed paths, I think you would use CGContextTranslateCTM.
I have a NSArray of points that make up a path. I can detect when it self-intersects. When this happens, I try to fill the path.
First I used CoreGraphics, now I'm using openGl to draw a triangle array. Doesn't work well as you can see in the image.
How do I fill only the circular area while leaving the "tail" alone? I was thinking of a reverse flood fill but don't think CG has any API functions for this...
Maybe instead of actually drawing the path you can just approximate the diameter of the path and draw a circle with your approximation.
Here is some code to detect a circle gesture on the iPhone:
http://www.mobileorchard.com/iphone-circle-gesture-detection/
Record all of the points in a doubly-linked list. When it comes time to fill, walk the list from the start and find the point that's closest to the end. Then, lineto that point, then lineto each point in reverse order, stopping with the second point in the list. The fill will implicitly close the path, which will jump from where you left off (the second point) back to the start (first) point.
This is just off the top of my head; you can play with a couple of variations on this to see what works best. You might record the closest previous node in each node, but this could get expensive for many nodes.