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Fix path stroking

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This commit is contained in:
nedko 2022-09-13 20:24:08 +03:00
parent da743e0e16
commit 9b43c90802
1 changed files with 22 additions and 3 deletions
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25
main_path.cpp
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@ -60,7 +60,7 @@ double get_angle(Point start, Point end)
if (vec.y < 0) if (vec.y < 0)
{ {
angle += 180.0; angle = 360 - angle;
} }
return angle; return angle;
@ -89,9 +89,28 @@ pair<Point, Point> perform_stroke(double stroke_size, double stroke_angle, Point
return result; return result;
} }
pair<Point, Point> perform_stroke(double stroke_size, double prev_angle, double curr_angle, Point point)
{
pair<Point, Point> result;
Point add;
double stroke_angle;
double extra_angle;
extra_angle = (curr_angle - prev_angle) / 2 + 90.0;
stroke_angle = extra_angle + prev_angle;
add.x = cos(radians(stroke_angle)) * stroke_size / 2 / sin(radians(extra_angle));
add.y = sin(radians(stroke_angle)) * stroke_size / 2 / sin(radians(extra_angle));
result.first = point + add;
result.second = point - add;
return result;
}
void usage(const string& name) void usage(const string& name)
{ {
cout << "Usage: " << name << "<stroke size> <x1> <y1> <x2> <y2> [<xN> <yN> ...]" << endl; cout << "Usage: " << name << " <stroke size> <x1> <y1> <x2> <y2> [<xN> <yN> ...]" << endl;
cout << "\tstroke size - how big the stroke should be" << endl; cout << "\tstroke size - how big the stroke should be" << endl;
cout << "\tx1 - x coordinate of first point" << endl; cout << "\tx1 - x coordinate of first point" << endl;
cout << "\ty1 - y coordinate of first point" << endl; cout << "\ty1 - y coordinate of first point" << endl;
@ -117,7 +136,7 @@ void get_polygon(double stroke_size, const vector<Point>& points)
} }
else else
{ {
tmp = perform_stroke(stroke_size, get_stroke_angle(prev_angle, curr_angle), points[i - 1]); tmp = perform_stroke(stroke_size, prev_angle, curr_angle, points[i - 1]);
} }
forward.push_back(tmp.first); forward.push_back(tmp.first);