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Issue-16 Fix 90 degree bug in find findPoint

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Actually very similar to issue-11, but I just didn't solve it 100%
This commit is contained in:
Kurt Hutten 2020-11-02 18:12:17 +11:00
parent a85e6ffd48
commit a6999a7202
2 changed files with 34 additions and 8 deletions
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31
polyround.scad
View File

@ -336,15 +336,22 @@ function parallelFollow(rp,thick=4,minR=1,mode=1)=
)
concat(cen,outR);
function is90or270(ang)=ang==90?1:ang==270?1:0;
function findPoint(ang1,refpoint1,ang2,refpoint2,r=0)=
// finds the intersection of two lines given two angles and points on those lines
let(
overrideX=is90or270(ang1)?
refpoint1.x:
is90or270(ang2)?
refpoint2.x:
0,
m1=tan(ang1),
c1=refpoint1.y-m1*refpoint1.x,
m2=tan(ang2),
c2=refpoint2.y-m2*refpoint2.x,
outputX=ang1==90?refpoint1.x:ang2==90?refpoint2.x:(c2-c1)/(m1-m2),
outputY=ang1==90?m2*outputX+c2:m1*outputX+c1
outputX=overrideX?overrideX:(c2-c1)/(m1-m2),
outputY=is90or270(ang1)?m2*outputX+c2:m1*outputX+c1
)
[outputX,outputY,r];
@ -384,13 +391,23 @@ function beamChain(radiiPoints,offset1=0,offset2,mode=0,minR=0,startAngle,endAng
getAngle(radiiPoints[Lrp-1],radiiPoints[Lrp-2])+endAngle:
endAngle,
OffLn1=[for(i=[0:Lrp3]) offset1==0?radiiPoints[i+1]:parallelFollow([radiiPoints[i],radiiPoints[i+1],radiiPoints[i+2]],offset1,minR,mode=CWorCCW1)],
OffLn2=[for(i=[0:Lrp3]) offset2==0?radiiPoints[i+1]:parallelFollow([radiiPoints[i],radiiPoints[i+1],radiiPoints[i+2]],offset2b,minR,mode=CWorCCW2)],
OffLn2=[for(i=[0:Lrp3]) offset2==0?radiiPoints[i+1]:parallelFollow([radiiPoints[i],radiiPoints[i+1],radiiPoints[i+2]],offset2b,minR,mode=CWorCCW2)],
Rp1=abs(radiiPoints[0].z),
Rp2=abs(radiiPoints[Lrp-1].z),
endP1a=findPoint(getAngle(radiiPoints[0],radiiPoints[1]), OffLn1[0], startAngle,radiiPoints[0], Rp1),
endP1b=findPoint(getAngle(radiiPoints[Lrp-1],radiiPoints[Lrp-2]), OffLn1[len(OffLn1)-1], endAngle,radiiPoints[Lrp-1], Rp2),
endP2a=findPoint(getAngle(radiiPoints[0],radiiPoints[1]), OffLn2[0], startAngle,radiiPoints[0], Rp1),
endP2b=findPoint(getAngle(radiiPoints[Lrp-1],radiiPoints[Lrp-2]), OffLn2[len(OffLn1)-1], endAngle,radiiPoints[Lrp-1], Rp2),
endP1aAngle = getAngle(radiiPoints[0],radiiPoints[1]),
endP1a=findPoint(endP1aAngle, OffLn1[0], startAngle,radiiPoints[0], Rp1),
endP1bAngle = getAngle(radiiPoints[Lrp-1],radiiPoints[Lrp-2]),
endP1b=findPoint(endP1bAngle, OffLn1[len(OffLn1)-1], endAngle,radiiPoints[Lrp-1], Rp2),
endP2aAngle = getAngle(radiiPoints[0],radiiPoints[1]),
endP2a=findPoint(endP2aAngle, OffLn2[0], startAngle,radiiPoints[0], Rp1),
endP2bAngle = getAngle(radiiPoints[Lrp-1],radiiPoints[Lrp-2]),
endP2b=findPoint(endP2bAngle, OffLn2[len(OffLn1)-1], endAngle,radiiPoints[Lrp-1], Rp2),
absEnda=getAngle(endP1a,endP2a),
absEndb=getAngle(endP1b,endP2b),
negRP1a=[cos(absEnda)*radiiPoints[0].z*10+endP1a.x, sin(absEnda)*radiiPoints[0].z*10+endP1a.y, 0.0],

11
roundAnythingExamples.scad
View File

@ -232,7 +232,7 @@ module gridpattern(memberW = 4, sqW = 12, iter = 5, r = 3){
module testGeometries() {
// Check these shapen preview (plus "thrown together") and render correctly with each PR
// Check these shapes preview (plus "thrown together") and render correctly with each PR
points = [
[0, 10, 5],
[10, 0, 5],
@ -248,6 +248,15 @@ module testGeometries() {
polyRoundExtrudeTestShape(points);
translate([0,20,0])polyRoundExtrudeTestShape(reversedPoints);
// Bug report submitted by @lopisan in issue #16, similar to #11, geometry breaks with 90 degree angles
didBreakWhen0=0;
issue16pointsa=[[0, 0, 0], [0+didBreakWhen0, 10, 0], [10, 10+didBreakWhen0, 0]];
translate([20,0,0])linear_extrude(1)polygon(polyRound( beamChain(issue16pointsa, offset1=1, offset2=-1), 30));
didBreakWhen0b=1e-6;
issue16pointsb=[[0, 0, 0], [0+didBreakWhen0b, 10, 0], [10, 10+didBreakWhen0b, 0]];
translate([20,15,0])linear_extrude(1)polygon(polyRound( beamChain(issue16pointsb, offset1=1, offset2=-1), 30));
}
module polyRoundExtrudeTestShape(points) {