Generating coordinates with Ruby

kmk111890

Hi, I'm looking for how to generates coordinate with an equation and connect the coordinates adding line or curve with ruby.

My idea was


ents = Sketchup.active_model.entities
pt0 = [a,b,c]
pt1 = [d,e,f]
pt2 = [g,h,i]

for k in 0...20

x = eq*pt0.x + eq*pt1.x + eq*pt2.x
y = eq*pt0.y + eq*pt1.y + eq*pt2.y
z = eq*pt0.z + eq*pt1.z + eq*pt2.z

pt3 = Geom;;Point3d.new(x, y, z)

end

ents.add_line pt3

pt0, pt1, pt2 are basic coordinates. 'eq' means random equation. We can add any equation with a variable 'k'

I know there are some errors, but don't know how to fix it. I wish 21 different coordinates are generated from the 'for loop' and they connect each other to draw a line. Can you help me?

sdmitch

@kmk111890 said:

Hi, I'm looking for how to generates coordinate with an equation and connect the coordinates adding line or curve with ruby.

My idea was


> ents = Sketchup.active_model.entities
> pt0 = [a,b,c]
> pt1 = [d,e,f]
> pt2 = [g,h,i]
> 
> for k in 0...20
> 
> x = eq*pt0.x + eq*pt1.x + eq*pt2.x
> y = eq*pt0.y + eq*pt1.y + eq*pt2.y
> z = eq*pt0.z + eq*pt1.z + eq*pt2.z
> 
> pt3 = Geom;;Point3d.new(x, y, z)
> 
> end
> 
> ents.add_line pt3
>

pt0, pt1, pt2 are basic coordinates. 'eq' means random equation. We can add any equation with a variable 'k'

I know there are some errors, but don't know how to fix it. I wish 21 different coordinates are generated from the 'for loop' and they connect each other to draw a line. Can you help me?

The .add_line functions requires a start and end. Your code only has an end. The ents.add_line statement should be inside the For loop. If not, only the last "pair" will be used in the .add_line.

slbaumgartner

In addition, if you gather the points into an Array you can use Entities#add_edges to create them all in one shot.

TIG

Something like this:

pt0 = [a, b, c]
pt1 = [d, e, f]
pt2 = [g, h, i]
pt3 = Geom;;Point3d.new(0, 0, 0)
pts = []
for k in 0...20
    x = eq*pt0.x + eq*pt1.x + eq*pt2.x
    y = eq*pt0.y + eq*pt1.y + eq*pt2.y
    z = eq*pt0.z + eq*pt1.z + eq*pt2.z
    pt3 = Geom;;Point3d.new(x, y, z)
    pts << pt3
end
Sketchup.active_model.active_entities.add_edges(pts)

Naturally you'll need to define the xyz value references a up to i, and the eq earlier on in the code...
BUT is this example it currently makes a straight line, k is never used ?
Is it actually eq ?
If so then currently the points would just 'step' up by 1" each time !
I suspect you somehow want to use pt3 iterated in the calculation [that's why I made it outside of the block before it starts changing] ?
e.g. x = eq*pt0.x + eq*pt1.x + eq*pt2.x**+ eq*pt3.x**

kmk111890

Thank you, sdmitch and TIG. I could partly understand how i have to fix the codes, but not perfect because I showed you code roughly. Maybe, it would be better i show you what i'm doing now. I'm trying to add bezier curve to draw one simple shape. The equation for the quadratic bezier curve represents as shown below

B(t) = (1-t)(1-t)P0+2(1-t)P1+(t)(t)P2

With the equation, I tried to generate coordinates which are from the equation and wanted to use 'For loop'. hmmm It looked like i can make the codes by myself, but didn't work well

ents = Sketchup.active_model.entities
Length = 1000
angle = (60)/2
angle2 = (45)/2
pt0 = [0,0,0]
pt1 = [Length.mm, 0, 0]
aa = 80*0.01
pt2 = pt1.transform(Geom;;Transformation.rotation(pt0,[0,-1,0],angle.degrees))
pt3 = pt1.transform(Geom;;Transformation.rotation(pt0,[0,-1,0],angle2.degrees))
pt4 = [Length.mm*aa, 0, 0]
pt5 = pt4.transform(Geom;;Transformation.rotation(pt0,[0,-1,0],angle.degrees))
arcarray = ents.add_arc [0,0,0], [1,0,0],[0,-1,0], Length.mm, 0, angle2.degrees
arc = arcarray[0]
arccurve = arc.curve
verts = arccurve.vertices

t1=0
x6 = (1-(t1))*(1-(t1))*pt5.x+2*(1-(t1))*(t1)*pt2.x+(t1)*(t1)*pt3.x
y6 = (1-(t1))*(1-(t1))*pt5.y+2*(1-(t1))*(t1)*pt2.y+(t1)*(t1)*pt3.y
z6 = (1-(t1))*(1-(t1))*pt5.z+2*(1-(t1))*(t1)*pt2.z+(t1)*(t1)*pt3.z

pt6 = Geom;;Point3d.new(x6, y6, z6)

t2=0.2
x7 = (1-(t2))*(1-(t2))*pt5.x+2*(1-(t2))*(t2)*pt2.x+(t2)*(t2)*pt3.x
y7 = (1-(t2))*(1-(t2))*pt5.y+2*(1-(t2))*(t2)*pt2.y+(t2)*(t2)*pt3.y
z7 = (1-(t2))*(1-(t2))*pt5.z+2*(1-(t2))*(t2)*pt2.z+(t2)*(t2)*pt3.z

pt7 = Geom;;Point3d.new(x7, y7, z7)

t3=0.4
x8 = (1-(t3))*(1-(t3))*pt5.x+2*(1-(t3))*(t3)*pt2.x+(t3)*(t3)*pt3.x
y8 = (1-(t3))*(1-(t3))*pt5.y+2*(1-(t3))*(t3)*pt2.y+(t3)*(t3)*pt3.y
z8 = (1-(t3))*(1-(t3))*pt5.z+2*(1-(t3))*(t3)*pt2.z+(t3)*(t3)*pt3.z

pt8 = Geom;;Point3d.new(x8, y8, z8)

t4=0.6
x9 = (1-(t4))*(1-(t4))*pt5.x+2*(1-(t4))*(t4)*pt2.x+(t4)*(t4)*pt3.x
y9 = (1-(t4))*(1-(t4))*pt5.y+2*(1-(t4))*(t4)*pt2.y+(t4)*(t4)*pt3.y
z9 = (1-(t4))*(1-(t4))*pt5.z+2*(1-(t4))*(t4)*pt2.z+(t4)*(t4)*pt3.z

pt9 = Geom;;Point3d.new(x9, y9, z9)

t5=0.8
x10 = (1-(t5))*(1-(t5))*pt5.x+2*(1-(t5))*(t5)*pt2.x+(t5)*(t5)*pt3.x
y10 = (1-(t5))*(1-(t5))*pt5.y+2*(1-(t5))*(t5)*pt2.y+(t5)*(t5)*pt3.y
z10 = (1-(t5))*(1-(t5))*pt5.z+2*(1-(t5))*(t5)*pt2.z+(t5)*(t5)*pt3.z

pt10 = Geom;;Point3d.new(x10, y10, z10)

t6=1
x11 = (1-(t6))*(1-(t6))*pt5.x+2*(1-(t6))*(t6)*pt2.x+(t6)*(t6)*pt3.x
y11 = (1-(t6))*(1-(t6))*pt5.y+2*(1-(t6))*(t6)*pt2.y+(t6)*(t6)*pt3.y
z11 = (1-(t6))*(1-(t6))*pt5.z+2*(1-(t6))*(t6)*pt2.z+(t6)*(t6)*pt3.z

pt11 = Geom;;Point3d.new(x11, y11, z11)


a = ents.add_line pt0, pt1
b = ents.add_line pt0, pt5
c = ents.add_curve pt0, pt6, pt7, pt8, pt9, pt10, pt11, pt1
face = ents.add_face pt6, pt7, pt8, pt9, pt10, pt11, pt1, pt0
path = ents.add_circle [Length,0,0], [-1,0,0], -Length
face.followme path
ents.erase_entities path

face2 = ents.add_face verts
path2 = ents.add_circle [Length,0,0], [-1,0,0], -Length
face2.followme path2
ents.erase_entities path2

group=ents.add_group ents.to_a

sdmitch

@kmk111890 said:

Thank you, sdmitch and TIG. I could partly understand how i have to fix the codes, but not perfect because I showed you code roughly. Maybe, it would be better i show you what i'm doing now. I'm trying to add bezier curve to draw one simple shape. The equation for the quadratic bezier curve represents as shown below

B(t) = (1-t)(1-t)P0+2(1-t)P1+(t)(t)P2

With the equation, I tried to generate coordinates which are from the equation and wanted to use 'For loop'. hmmm It looked like i can make the codes by myself, but didn't work well

This seems to work

ents = Sketchup.active_model.entities
Length = 1000
angle = (60)/2
angle2 = (45)/2
pt0 = [0,0,0]
pt1 = [Length.mm, 0, 0]
aa = 80*0.01
pt2 = pt1.transform(Geom;;Transformation.rotation(pt0,[0,-1,0],angle.degrees))
pt3 = pt1.transform(Geom;;Transformation.rotation(pt0,[0,-1,0],angle2.degrees))
pt4 = [Length.mm*aa, 0, 0]
pt5 = pt4.transform(Geom;;Transformation.rotation(pt0,[0,-1,0],angle.degrees))
arcarray = ents.add_arc [0,0,0], [1,0,0],[0,-1,0], Length.mm, 0, angle2.degrees
arc = arcarray[0]
arccurve = arc.curve
verts = arccurve.vertices
pts=[];pts<<pt0
0.step(1,0.2) do |t1|
  x = (1-(t1))*(1-(t1))*pt5.x+2*(1-(t1))*(t1)*pt2.x+(t1)*(t1)*pt3.x
  y = (1-(t1))*(1-(t1))*pt5.y+2*(1-(t1))*(t1)*pt2.y+(t1)*(t1)*pt3.y
  z = (1-(t1))*(1-(t1))*pt5.z+2*(1-(t1))*(t1)*pt2.z+(t1)*(t1)*pt3.z
  pts << Geom;;Point3d.new(x, y, z)
end
pts<<pt1
a = ents.add_line pt0, pt1
b = ents.add_line pt0, pt5
c = ents.add_curve pts
face = ents.add_face pts
path = ents.add_circle [Length,0,0], [-1,0,0], -Length
face.followme path
ents.erase_entities path

face2 = ents.add_face verts
path2 = ents.add_circle [Length,0,0], [-1,0,0], -Length
face2.followme path2
ents.erase_entities path2

group=ents.add_group ents.to_a