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Join multiple line segments into one line - GIS - Stack Overflow
Now, click on the last vertex of a line, and get the mouse closer to the vertex that you wish to join (QGIS will mark it in pink). After you have joined the line, remember to use the dissolve tool to merge attributes, so that only one row on the attribute table remains.
How do you detect where two line segments intersect? [closed]
Now move line segment b the same way and check if the new points of line segment b are on different sides of line a. If this is the case, check it the other way around. If this is also the case, the line segments intersect. If not, they don't intersect. Question A: Where do two line segments intersect? You know that two line segments a and b ...
algorithm - Joining unordered line segments - Stack Overflow
My algorithm produces a list of (usually) several thousand line segments (all 2D) which I need to join up into large polylines. These resulting polylines might be closed or open, but they are never self-intersecting. The line segments are not directed, i.e. it might be needed to flip a line segment before it can be joined to its neighbour.
plot - Drawing line segments in R - Stack Overflow
I've got some x and y coordinates that I am trying to plot into line segments. And I'm getting some unexpected behavior from what I think should work. For each segment, there is a starting set of coordinates (x1,y1) and an ending set of coordinates (x2,y2). It's a data frame (call it 'df') that looks like this:
How can I check if two segments intersect? - Stack Overflow
Check if the two line segments are non zero length line and distinct segments. From hereon, I assume that the two segments are non-zero length and distinct. For each line segment, compute the slope of the line and then obtain the equation of a line in the form of ax + by + c = 0.
Overlapping line segments in 2D space - Stack Overflow
For two co-linear line segments that are not necessarily axis-aligned: Sort the vertices in clockwise order around the origin. The lines overlap if the ordered vertices alternate between the two segments, e.g. Line1.Point1, Line2.Point1, Line1.Point2, Line2.Point2.
Efficient maths algorithm to calculate intersections
determine if the intersection belong to both line segments. But when intersection does not occur often, a better way probably is to reverse these steps: express the straight lines in the form of y = ax + b (line passing A,B) and y = cx + d (line passing C,D) see if C and D are on the same side of y = ax+b; see if A and B are on the same side of ...
Line Segments in Matplotlib - Stack Overflow
Given coordinates of [1,5,7,3,5,10,3,6,8] for matplotlib.pyplot, how do I highlight or colour different segments of the line. For instance, the coordinates 1-3 ([1,5,7,3]) in the list represent attribute a. How do I colour this bit of the line and mark it in the legend? Edit: The list in question contains tens of thousands of elements.
python - Merging multiple line segments - Stack Overflow
I have around 21,000 line segments which I need to render in each frame of my render (unless the user zooms in, in which case line segments are culled and not sent to the card at all). This is currently taking around 1.5 seconds each frame to complete. That's just not good enough, so I'm looking at ways to reduce the number of distinct line ...
Shortest distance between two line segments - Stack Overflow
I need a function to find the shortest distance between two line segments. A line segment is defined by two endpoints. So for example one of my line segments (AB) would be defined by the two points A (x1,y1) and B (x2,y2) and the other (CD) would be defined by the two points C (x1,y1) and D (x2,y2).
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