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Fixed typo in find_circle_3points()

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This commit is contained in:
Revar Desmera 2019-08-16 02:06:04 -07:00
parent 1e0ca09182
commit 0843bf7362
1 changed files with 33 additions and 3 deletions
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36
geometry.scad
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@ -107,10 +107,18 @@ function distance_from_line(line, pt) =
// Usage:
// line_normal([P1,P2])
// line_normal(p1,p2)
// Description: Returns the 2D normal vector to the given 2D line.
// Description:
// Returns the 2D normal vector to the given 2D line. This is otherwise known as the perpendicular vector counter-clockwise to the given ray.
// Arguments:
// p1 = First point on 2D line.
// p2 = Second point on 2D line.
// Example(2D):
// p1 = [10,10];
// p2 = [50,30];
// n = line_normal(p1,p2);
// stroke([p1,p2], endcap2="arrow2");
// color("green") stroke([p1,p1+10*n], endcap2="arrow2");
// color("blue") place_copies([p1,p2]) circle(d=2, $fn=12);
function line_normal(p1,p2) =
is_undef(p2)? line_normal(p1[0],p1[1]) :
normalize([p1.y-p2.y,p2.x-p1.x]);
@ -191,6 +199,22 @@ function line_segment_intersection(line,segment,eps=EPSILON) =
// pt3 = A point that the second ray passes though.
// r = The radius of the circle to find.
// d = The diameter of the circle to find.
// Example(2D):
// pts = [[60,40], [10,10], [65,5]];
// rad = 10;
// stroke([pts[1],pts[0]], endcap2="arrow2");
// stroke([pts[1],pts[2]], endcap2="arrow2");
// circ = find_circle_2tangents(pt1=pts[0], pt2=pts[1], pt3=pts[2], r=rad);
// translate(circ[0]) {
// color("green") {
// stroke(circle(r=rad),closed=true);
// stroke([[0,0],rad*[cos(315),sin(315)]]);
// }
// }
// place_copies(pts) color("blue") circle(d=2, $fn=12);
// translate(circ[0]) color("red") circle(d=2, $fn=12);
// labels = [[pts[0], "pt1"], [pts[1],"pt2"], [pts[2],"pt3"], [circ[0], "CP"], [circ[0]+[cos(315),sin(315)]*rad*0.7, "r"]];
// for(l=labels) translate(l[0]+[0,2]) color("black") text(text=l[1], size=2.5, halign="center");
function find_circle_2tangents(pt1, pt2, pt3, r=undef, d=undef) =
let(
r = get_radius(r=r, d=d, dflt=undef),
@ -221,6 +245,12 @@ function find_circle_2tangents(pt1, pt2, pt3, r=undef, d=undef) =
// pt1 = The first point.
// pt2 = The second point.
// pt3 = The third point.
// Example(2D):
// pts = [[60,40], [10,10], [65,5]];
// circ = find_circle_3points(pts[0], pts[1], pts[2]);
// translate(circ[0]) color("green") stroke(circle(r=circ[1]),closed=true,$fn=72);
// translate(circ[0]) color("red") circle(d=3, $fn=12);
// place_copies(pts) color("blue") circle(d=3, $fn=12);
function find_circle_3points(pt1, pt2, pt3) =
collinear(pt1,pt2,pt3)? [undef,undef,undef] :
let(
@ -247,7 +277,7 @@ function find_circle_3points(pt1, pt2, pt3) =
l2 = [mp2, mp2+mpv2],
isect = line_intersection(l1,l2)
) is_undef(isect)? [undef,undef,undef] : let(
r = norm(p2-isect)
r = norm(pt2-isect)
) [isect, r, n2];
@ -663,7 +693,7 @@ function point_in_region(point, region, eps=EPSILON, _i=0, _cnt=0) =
// pointlist_bounds(pts);
// Description:
// Finds the bounds containing all the 2D or 3D points in `pts`.
// Returns [[minx, miny, minz], [maxx, maxy, maxz]]
// Returns `[[MINX, MINY, MINZ], [MAXX, MAXY, MAXZ]]`
// Arguments:
// pts = List of points.
function pointlist_bounds(pts) = [