Extend Multiple Towards

Question

Extend Multiple Towards

zeffii opened this issue 10 years ago · comments

Desired functionality:

Select an edge: (call this Edge Prime)
- it becomes dotted as to suggest it will be used for the destination.
Any subsequent clicked edge will be extended towards Edge Prime , if they are calculated to intersect.

If no welding is performed for Extended edges onto Edge Prime then this is doable and nice exercise if i'm bored some time.

Dealga McArdle · Answer 1 · Mon Mar 10 2014 07:59:25 GMT+0800 (China Standard Time)

pseudo code

force edge mode
- first selected, becomes Edge_Prime
    - draw dots over Edge_Prime
- subsequent clicked edges are checked if they extend towards Edge_Prime
    - if yes, this edge is Edge_RX
        - get location of intersection on Edge_Prime
        if intersection is on Edge_Prime
            - call intersection IntX
            - figure out which vertex of Edge_RX is closest to IntX call it Vlast
            - extend from Vlast to IntX

Dealga McArdle · Answer 2 · Mon Mar 10 2014 08:09:29 GMT+0800 (China Standard Time)

or.....

''' Extend Multiple'''

mode 0 extend towards (this creates a new edge)
mode 1 moves the closest vertex to the projected intersection.

force edge mode
- first selected, becomes Edge_Prime
    - draw dots over Edge_Prime
- subsequent clicked edges are checked if they extend towards Edge_Prime
    - if yes, this edge is Edge_RX
        - get location of intersection on Edge_Prime
        if intersection is on Edge_Prime
            - call intersection IntX
            - figure out which vertex of Edge_RX is closest to IntX call it Vlast

            if mode==0
                - extend from Vlast to IntX
            else:
                - move Vlast to IntX

Dealga McArdle · Answer 3 · Mon Mar 10 2014 19:32:25 GMT+0800 (China Standard Time)

"""
''' Extend Multiple'''

mode 0 extend towards (this creates a new edge)
mode 1 moves the closest vertex to the projected intersection.

force edge mode
- first selected, becomes Edge_Prime
    - draw dots over Edge_Prime
- subsequent clicked edges are checked if they extend towards Edge_Prime
    - if yes, this edge is Edge_RX
        - get location of intersection on Edge_Prime
        if intersection is on Edge_Prime
            - call intersection IntX
            - which vertex of Edge_RX is closest to idx.
                - call that point Vlast

            if mode==0
                - extend from Vlast to idx
            else:
                - move Vlast to idx
"""


def does_edge_intersect(edge_rx, edge_prime):
    # return point
    pass

def is_point_on_edge(point, edge_prime):
    # this might be an intersection on the mathematical concept of a line
    # that's no good. I want it to really be a point on the edge.
    pass

def closest_idx_to_intersection(point, edge_rx):
    # returns idx , integer
    pass

def draw_edge_prime(self, context, edge_prime):
    pass

def add_vertex(point):
    # add new vertex, and new edge, edge = [idx, vc]
    pass

def move_vertex(idx, point):
    pass


def checkEdge(edge_rx):
    point = does_edge_intersect(edge_rx, edge_prime)
    if point:
        if not is_point_on_edge(point, edge_prime):
            continue
        idx = closest_idx_to_intersection(point, edge_rx)
        if mode == 0:
            add_vertex(point)
        elif mode == 1:
            move_vertex(idx, point)

Dealga McArdle · Answer 4 · Mon Mar 10 2014 21:31:16 GMT+0800 (China Standard Time)

some design decisions..

Do I code edge detection to deal with hovering of individual edges? or use the edge selection feature as built-in.

Dealga McArdle · Answer 5 · Mon Mar 10 2014 21:43:45 GMT+0800 (China Standard Time)

I think, i'll store all selected edges in a list,

launch operator
- start new empty edge_list
- store already selected edges in a restore_list
- force un-selection of all edges if len(restore_list) > 0
let User select edges, store them in edges_list
draw edges[0] using dotted gl_line
draw edges[1:] using a different indicator
- only add edges to list if they intersect
- draw extention towards intersection for each edge
when hitting enter,
- perform addition to the geometry
- remove all items from edge list
- clear drawing ( end operator )
- if len(restore_list) > 0 then reselect them