def __init__(self):
ShowBase.__init__(self)
winProps = WindowProperties()
winProps.setTitle("Triangle and SimpleCircle Unittest")
# base.win.requestProperties(winProps) (same as below e.g. self == base)
self.win.requestProperties(winProps)
# 1) create GeomVertexData
frmt = GeomVertexFormat.getV3n3cp()
vdata = GeomVertexData('triangle_developer', frmt, Geom.UHDynamic)
# 2) create Writers/Rewriters (must all be created before any readers and readers are one-pass-temporary)
vertex = GeomVertexRewriter(vdata, 'vertex')
normal = GeomVertexRewriter(vdata, 'normal')
color = GeomVertexRewriter(vdata, 'color')
zUp = Vec3(0, 0, 1)
wt = Vec4(1.0, 1.0, 1.0, 1.0)
gr = Vec4(0.5, 0.5, 0.5, 1.0)
# 3) write each column on the vertex data object (for speed, have a different writer for each column)
def addPoint(x, y, z):
vertex.addData3f(x, y, z)
normal.addData3f(zUp)
color.addData4f(wt)
addPoint(0.0, 0.0, 0.0)
addPoint(5.0, 0.0, 0.0)
addPoint(0.0, 5.0, 0.0)
addPoint(15.0, 15.0, 0.0)
# 4) create a primitive and add the vertices via index (not truely associated with the actual vertex table, yet)
tris = GeomTriangles(Geom.UHDynamic)
t1 = Triangle(0, 1, 2, vdata, tris, vertex)
t2 = Triangle(2, 1, 3, vdata, tris, vertex)
c1 = t1.getCircumcircle()
t1AsEnum = t1.asPointsEnum()
r0 = (t1AsEnum.point0 - c1.center).length()
r1 = (t1AsEnum.point1 - c1.center).length()
r2 = (t1AsEnum.point2 - c1.center).length()
assert abs(r0 - r2) < utilities.EPSILON and abs(r0 - r1) < utilities.EPSILON
t2AsEnum = t2.asPointsEnum()
c2 = t2.getCircumcircle()
r0 = (t2AsEnum.point0 - c2.center).length()
r1 = (t2AsEnum.point1 - c2.center).length()
r2 = (t2AsEnum.point2 - c2.center).length()
assert abs(r0 - r2) < utilities.EPSILON and abs(r0 - r1) < utilities.EPSILON
assert t1.getAngleDeg0() == 90.0
assert t1.getAngleDeg1() == t1.getAngleDeg2()
oldInd0 = t1.pointIndex0
oldInd1 = t1.pointIndex1
oldInd2 = t1.pointIndex2
t1.pointIndex0 = t1.pointIndex1
t1.pointIndex1 = oldInd0
assert t1.pointIndex0 == oldInd1
assert t1.pointIndex1 == oldInd0
assert t1.pointIndex0 != t1.pointIndex1
t1.reverse()
assert t1.pointIndex1 == oldInd2
# 5.1) (adding to scene) create a Geom and add primitives of like base-type i.e. triangles and triangle strips
geom = Geom(vdata)
geom.addPrimitive(tris)
# 5.2) create a GeomNode to hold the Geom(s) and add the Geom(s)
gn = GeomNode('gnode')
gn.addGeom(geom)
# 5.3) attache the node to the scene
gnNodePath = render.attachNewNode(gn)
# setup a wire frame
wireNP = render.attachNewNode('wire')
wireNP.setPos(0.0, 0.0, .1)
wireNP.setColor(0.1, 0.1, 0.1, 1)
wireNP.setRenderMode(RenderModeAttrib.MWireframe, .5, 0)
gnNodePath.instanceTo(wireNP)
# test and draw intersections and circles
pt1 = Point3(0.0, 5.0, 0.0)
pt2 = Point3(1.0, 5.0, 0.0)
intersection = t2.getIntersectionsWithCircumcircle(pt1, pt2)
circle = t2.getCircumcircle()
cuts = 128
border = circle.getBorder(cuts, closed=True)
assert len(border) == cuts or (len(border) == cuts + 1 and border[0] == border[len(border) - 1])
n = len(border)
xMid = yMid = 0
for p in border:
xMid += p.x
yMid += p.y
mid = Point3(xMid / n, yMid / n, border[0].z)
assert mid.almostEqual(circle.center, 0.06)
assert t2.isCcw()
assert t1.containsPoint(c1.center) != t1.containsPoint(c1.center, includeEdges=False)
circleSegs = LineSegs("circleLines")
circleSegs.setColor(1.0, 0.0, 0.0, 1.0)
for p in border:
circleSegs.drawTo(*p)
circleNode = circleSegs.create(False)
circleNP = render.attachNewNode(circleNode)
circleNP.setZ(-5)
originSpot = LineSegs("intersection")
originSpot.setColor(1.0, 0.0, 0.0, 1.0)
originSpot.setThickness(10)
for p in intersection:
originSpot.drawTo(p)
spotNode = originSpot.create(False)
spotNP = render.attachNewNode(spotNode)
circleNP.setZ(-0.75)
# fix the camera rot/pos
PHF.PanditorDisableMouseFunc()
camera.setPos(0.0, 0.0, 50.0)
camera.lookAt(c2.center)
PHF.PanditorEnableMouseFunc()
