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I encountered an error from func:computeIntersect when no line is det… #3

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19 changes: 9 additions & 10 deletions scannerLite.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -49,15 +49,14 @@ bool cmp_x(const Line &p1, const Line &p2) {
* @return Intersect Point
*/
Point2f computeIntersect(Line l1, Line l2) {
int x1 = l1._p1.x, x2 = l1._p2.x, y1 = l1._p1.y, y2 = l1._p2.y;
int x3 = l2._p1.x, x4 = l2._p2.x, y3 = l2._p1.y, y4 = l2._p2.y;
if (float d = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4)) {
Point2f pt;
pt.x = ((x1 * y2 - y1 * x2) * (x3 - x4) - (x1 - x2) * (x3 * y4 - y3 * x4)) / d;
pt.y = ((x1 * y2 - y1 * x2) * (y3 - y4) - (y1 - y2) * (x3 * y4 - y3 * x4)) / d;
return pt;
}
return Point2f(-1, -1);
Point2f a = l1._p1, b = l1._p2, c = l2._p1, d = l2._p2;
int denominator = (b.y - a.y) * (d.x - c.x) - (a.x - b.x) * (c.y - d.y);
if (denominator == 0) {
return Point2f(-1, -1);
}
int x = ((b.x - a.x) * (d.x - c.x) * (c.y - a.y) + (b.y - a.y) * (d.x - c.x) * a.x - (d.y - c.y) * (b.x - a.x) * c.x) / denominator;
int y = -((b.y - a.y) * (d.y - c.y) * (c.x - a.x) + (b.x - a.x) * (d.y - c.y) * a.y - (d.x - c.x) * (b.y - a.y) * c.y) / denominator;
return Point2f(x, y);
}

void scan(String file, bool debug = true) {
Expand Down Expand Up @@ -179,4 +178,4 @@ int main(int argc, char** argv) {
string img_path[] = {"images/doc1.jpg", "images/doc2.jpg", "images/doc3.jpg"};
scan(img_path[2]);
return 0;
}
}