export function addLinesForTriangle(
elements: Array<Renderable>, origin: Coords2d, sign: number) {
let v0 = origin;
let v1 = Coords2d.fromXY(origin.x + sign*triWidth, origin.y);
let v2 = Coords2d.fromXY(
origin.x + sign*triWidth/2, origin.y + sign * triHeight);
elements.push(new Line(v0, v1));
elements.push(new Line(v1, v2));
elements.push(new Line(v2, v0));
elements.push(new Line(
origin.plus(triBase[0].asOffsetFromOrigin().timesReal(sign)),
origin.plus(triRight.asOffsetFromOrigin().timesReal(sign))));
let inner = [
triInner[0].asOffsetFromOrigin(),
triInner[1].asOffsetFromOrigin()];
elements.push(new Line(
origin.plus(triLeft.asOffsetFromOrigin().timesReal(sign)),
origin.plus(inner[0].timesReal(sign))));
elements.push(new Line(
origin.plus(triBase[2].asOffsetFromOrigin().timesReal(sign)),
origin.plus(inner[1].timesReal(sign))));
return elements;
}
center (): Coords2d {
return this.origin.plus(this.size.asOffsetCoords().timesReal(0.5));
}
center (): Coords2d {
return this.origin.plus(this.diagonal.timesReal(0.5));
}
export function addLinesForSquare(
elements: Array<Renderable>, origin: Coords2d, angle: number) {
// Extract the dimensions for the capstone triangle from its
// simplest orientation in the base of the equilateral triangle.
let bottom = capLeft;
let top = 1 - capLeft;
let sin = Math.sin(angle);
let cos = Math.cos(angle);
let basis = [
OffsetCoords2d.fromDxDy(cos, sin),
OffsetCoords2d.fromDxDy(-sin, cos),
];
// All six corners in two adjacent grid squares, ordered
// widdershins from the base.
let corners = [
origin,
origin.plus(basis[0]),
origin.plus(basis[0].timesReal(2)),
origin.plus(basis[0].timesReal(2)).plus(basis[1]),
origin.plus(basis[0]).plus(basis[1]),
origin.plus(basis[1])];
elements.push(new Line(corners[0], corners[2]));
elements.push(new Line(corners[2], corners[3]));
elements.push(new Line(corners[3], corners[5]));
elements.push(new Line(corners[5], corners[0]));
elements.push(new Line(corners[1], corners[4]));
let vTop = [
corners[5].plus(basis[0].timesReal(top)),
corners[3].plus(basis[0].timesReal(-bottom))];
let vBottom = [
corners[0].plus(basis[0].timesReal(bottom)),
corners[2].plus(basis[0].timesReal(-top))];
let vLeft = corners[0].plus(basis[1].timesReal(0.5));
let vCenter = corners[1].plus(basis[1].timesReal(0.5));
let vRight = corners[2].plus(basis[1].timesReal(0.5));
let innerVecs = [
vLeft.asOffsetFrom(vBottom[0]),
vRight.asOffsetFrom(vTop[1])];
let innerCoeff = triBase[0].x / (triWidth / 2);
let vInner = [
vBottom[0].plus(innerVecs[0].timesReal(innerCoeff)),
vTop[1].plus(innerVecs[1].timesReal(innerCoeff))];
elements.push(new Line(vLeft, vBottom[0]));
elements.push(new Line(vInner[0], vCenter));
elements.push(new Line(vInner[0], vTop[0]));
elements.push(new Line(vTop[1], vRight));
elements.push(new Line(vInner[1], vCenter));
elements.push(new Line(vInner[1], vBottom[1]));
let vOutsideLeft = corners[5].plus(basis[0].timesReal(-capLeft));
elements.push(new Line(vOutsideLeft, vLeft));
let vOutsideRight = corners[2].plus(basis[0].timesReal(capLeft));
elements.push(new Line(vRight, vOutsideRight));
console.log(`Horizontal shift: ${1 - top}`);
}