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Cleaned up the calculation of bounds of symbols, this fixes bounds calculation with symmetries.

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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1178 0fc631ac-6414-0410-93d0-97cfa31319b6
This commit is contained in:
twanvl
2008-08-27 23:46:31 +00:00
parent 4b2a36bba8
commit ce906e83f8
11 changed files with 192 additions and 135 deletions
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src/gfx/bezier.cpp
+19 -25
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@@ -94,23 +94,28 @@ void segment_subdivide(const ControlPoint& p0, const ControlPoint& p1, const Vec
// ----------------------------------------------------------------------------- : Bounds
void segment_bounds(const Rotation& rot, const ControlPoint& p1, const ControlPoint& p2, Vector2D& min, Vector2D& max) {
Bounds segment_bounds(const Vector2D& origin, const Matrix2D& m, const ControlPoint& p1, const ControlPoint& p2) {
assert(p1.segment_after == p2.segment_before);
if (p1.segment_after == SEGMENT_LINE) {
line_bounds (rot, p1.pos, p2.pos, min, max);
return line_bounds (origin, m, p1.pos, p2.pos);
} else {
bezier_bounds(rot, p1, p2, min, max);
return bezier_bounds(origin, m, p1, p2);
}
}
void bezier_bounds(const Rotation& rot, const ControlPoint& p1, const ControlPoint& p2, Vector2D& min, Vector2D& max) {
Bounds bezier_bounds(const Vector2D& origin, const Matrix2D& m, const ControlPoint& p1, const ControlPoint& p2) {
assert(p1.segment_after == SEGMENT_CURVE);
// Transform the control points
Vector2D r1 = origin + p1.pos * m;
Vector2D r2 = origin + (p1.pos + p1.delta_after) * m;
Vector2D r3 = origin + (p2.pos + p2.delta_before) * m;
Vector2D r4 = origin + p2.pos * m;
// First of all, the corners should be in the bounding box
point_bounds(rot, p1.pos, min, max);
point_bounds(rot, p2.pos, min, max);
Bounds bounds(r1);
bounds.update(r4);
// Solve the derivative of the bezier curve to find its extremes
// It's only a quadtratic equation :)
BezierCurve curve(p1,p2);
BezierCurve curve(r1,r2,r3,r4);
double roots[4];
UInt count;
count = solve_quadratic(3*curve.a.x, 2*curve.b.x, curve.c.x, roots);
@@ -119,35 +124,24 @@ void bezier_bounds(const Rotation& rot, const ControlPoint& p1, const ControlPoi
for (UInt i = 0 ; i < count ; ++i) {
double t = roots[i];
if (t >=0 && t <= 1) {
point_bounds(rot, curve.pointAt(t), min, max);
bounds.update(curve.pointAt(t));
}
}
return bounds;
}
void line_bounds(const Rotation& rot, const Vector2D& p1, const Vector2D& p2, Vector2D& min, Vector2D& max) {
point_bounds(rot, p1, min, max);
point_bounds(rot, p2, min, max);
Bounds line_bounds(const Vector2D& origin, const Matrix2D& m, const Vector2D& p1, const Vector2D& p2) {
Bounds bounds(origin + p1 * m);
bounds.update(origin + p2 * m);
return bounds;
}
void point_bounds(const Rotation& rot, const Vector2D& p, Vector2D& min, Vector2D& max) {
Vector2D pr = rot.tr(p);
min = piecewise_min(min, pr);
max = piecewise_max(max, pr);
}
// Is a point inside the bounds <min...max>?
bool point_in_bounds(const Vector2D& p, const Vector2D& min, const Vector2D& max) {
return p.x >= min.x && p.y >= min.y &&
p.x <= max.x && p.y <= max.y;
}
// ----------------------------------------------------------------------------- : Point tests
// Is a point inside a symbol shape?
bool point_in_shape(const Vector2D& pos, const SymbolShape& shape) {
// Step 1. compare bounding box of the part
if (!point_in_bounds(pos, shape.min_pos, shape.max_pos)) return false;
if (!shape.bounds.contains(pos)) return false;
// Step 2. trace ray outward, count intersections
int count = 0;