From 1e9704dca9a861ffb7b2d3978e1390bea7af7ef0 Mon Sep 17 00:00:00 2001
From: neoraider <devnull@localhost>
Date: Wed, 26 Sep 2007 19:28:04 +0000
Subject: zoomedit: ?berschlagene Polygone werden jetzt korrekt gerendert

---
 Line.cpp | 52 ++++++++++++++++++++++++++--------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

(limited to 'Line.cpp')

diff --git a/Line.cpp b/Line.cpp
index 4bc0c3c..463a6ab 100644
--- a/Line.cpp
+++ b/Line.cpp
@@ -3,52 +3,52 @@
 
 
 bool Line::contains(const Vertex &v) const {
-  if(v1.getX() == v2.getX() && v1.getY() == v2.getY()) {
-    if(v1.getX() == v.getX() && v1.getY() == v.getY())
+  if(fabs(v1.getX() - v2.getX()) < 1E-6 && fabs(v1.getY() - v2.getY()) < 1E-6) {
+    if(fabs(v1.getX() - v.getX()) < 1E-6 && fabs(v1.getY() - v.getY()) < 1E-6)
       return true;
     else
       return false;
   }
   
-  if(v1.getX() == v2.getX()) {
-    if(v1.getX() != v.getX())
+  if(fabs(v1.getX() - v2.getX()) < 1E-6) {
+    if(fabs(v1.getX() - v.getX()) >= 1E-6)
       return false;
-    else if(v.getY() >= fmin(v1.getY(), v2.getY()) && v.getY() <= fmax(v1.getY(), v2.getY()))
+    else if(v.getY() - fmin(v1.getY(), v2.getY()) > -1E-6 && v.getY() - fmax(v1.getY(), v2.getY()) < 1E-6)
       return true;
     else
       return false;
   }
   
-  if(v1.getY() == v2.getY()) {
-    if(v1.getY() != v.getY())
+  if(fabs(v1.getY() - v2.getY()) < 1E-6) {
+    if(fabs(v1.getY() - v.getY()) >= 1E-6)
       return false;
-    else if(v.getX() >= fmin(v1.getX(), v2.getX()) && v.getX() <= fmax(v1.getX(), v2.getX()))
+    else if(v.getX() - fmin(v1.getX(), v2.getX()) > -1E-6 && v.getX() - fmax(v1.getX(), v2.getX()) < 1E-6)
       return true;
     else
       return false;
   }
-  if((v.getX()-v1.getX())/(v2.getX()-v1.getX()) - (v.getY()-v1.getY())/(v2.getY()-v1.getY()) == 0)
+  if(fabs((v.getX()-v1.getX())/(v2.getX()-v1.getX()) - (v.getY()-v1.getY())/(v2.getY()-v1.getY())) < 1E-6)
     return true;
   else
     return false;
 }
 
 int Line::intersects(const Line &l, Vertex *v) const {
-  double xa1 = v1.getX(), ya1 = v1.getY();
-  double xa2 = v2.getX(), ya2 = v2.getY();
-  double xb1 = l.v1.getX(), yb1 = l.v1.getY();
-  double xb2 = l.v2.getX(), yb2 = l.v2.getY();
-  double temp;
+  float xa1 = v1.getX(), ya1 = v1.getY();
+  float xa2 = v2.getX(), ya2 = v2.getY();
+  float xb1 = l.v1.getX(), yb1 = l.v1.getY();
+  float xb2 = l.v2.getX(), yb2 = l.v2.getY();
+  float temp;
   int switched = 0;
   Vertex v2;
   
   
   if(!v) v = &v2;
   
-  if(xa1 == xa2 && ya1 == ya2) return INTERSECTION_ERROR;
-  if(xb1 == xb2 && yb1 == yb2) return INTERSECTION_ERROR;
+  if(fabs(xa1 - xa2) < 1E-6 && fabs(ya1 - ya2) < 1E-6) return INTERSECTION_ERROR;
+  if(fabs(xb1 - xb2) < 1E-6 && fabs(yb1 - yb2) < 1E-6) return INTERSECTION_ERROR;
   
-  if(xa1 == xa2 || xb1 == xb2) {
+  if(fabs(xa1 - xa2) < 1E-6 || fabs(xb1 - xb2) < 1E-6) {
     temp = xa1; xa1 = ya1; ya1 = temp;
     temp = xa2; xa2 = ya2; ya2 = temp;
     temp = xb1; xb1 = yb1; yb1 = temp;
@@ -57,24 +57,24 @@ int Line::intersects(const Line &l, Vertex *v) const {
     switched = 1;
   }
   
-  if(xa1 == xa2 && xb1 == xb2)
-    return (xa1 == xb1) ? INTERSECTION_IDENTICAL : INTERSECTION_NONE;
+  if(fabs(xa1 - xa2) < 1E-6 && fabs(xb1 - xb2) < 1E-6)
+    return (fabs(xa1 - xb1) < 1E-6) ? INTERSECTION_IDENTICAL : INTERSECTION_NONE;
   
-  if(xa1 == xa2) {
+  if(fabs(xa1 - xa2) < 1E-6) {
     v->setX(xa1);
     v->setY(yb1);
   }
-  else if(xb1 == xb2) {
+  else if(fabs(xb1 - xb2) < 1E-6) {
     v->setX(xb1);
     v->setY(ya1);
   }
   else {
-    double ma = (ya2-ya1)/(xa2-xa1);
-    double mb = (yb2-yb1)/(xb2-xb1);
-    double ba = ya1 - ma*xa1;
-    double bb = yb1 - mb*xb1;
+    float ma = (ya2-ya1)/(xa2-xa1);
+    float mb = (yb2-yb1)/(xb2-xb1);
+    float ba = ya1 - ma*xa1;
+    float bb = yb1 - mb*xb1;
     
-    if(ma == mb) return (ba == bb) ? INTERSECTION_IDENTICAL : INTERSECTION_NONE;
+    if(fabs(ma - mb) < 1E-6) return (fabs(ba - bb) < 1E-6) ? INTERSECTION_IDENTICAL : INTERSECTION_NONE;
     
     v->setX((bb-ba)/(ma-mb));
     v->setY(ma*v->getX() + ba);
-- 
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