Changeset 10887 in josm for trunk/src/org/openstreetmap/josm
 Timestamp:
 20160824T00:35:23+02:00 (4 years ago)
 File:

 1 edited
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trunk/src/org/openstreetmap/josm/data/osm/visitor/paint/StyledMapRenderer.java
r10875 r10887 110 110 /* 'prev0' is a point that has distance 'offset' from 'prev' and the 111 111 * line from 'prev' to 'prev0' is perpendicular to the way segment from 112 * 'prev' to the next point.112 * 'prev' to the current point. 113 113 */ 114 114 private double xPrev0; … … 138 138 } 139 139 140 double xCurrent = current.getInViewX(); 141 double yCurrent = current.getInViewY(); 140 142 if (idx == nodes.size()  1) { 141 143 ++idx; 142 144 if (prev != null) { 143 return mapState.getForView(xPrev0 + current.getInViewX() prev.getInViewX(),144 yPrev0 + current.getInViewY() prev.getInViewY());145 return mapState.getForView(xPrev0 + xCurrent  prev.getInViewX(), 146 yPrev0 + yCurrent  prev.getInViewY()); 145 147 } else { 146 148 return current; … … 149 151 150 152 MapViewPoint next = getForIndex(idx + 1); 151 152 double dxNext = next.getInViewX()  current.getInViewX(); 153 double dyNext = next.getInViewY()  current.getInViewY(); 153 double dxNext = next.getInViewX()  xCurrent; 154 double dyNext = next.getInViewY()  yCurrent; 154 155 double lenNext = Math.sqrt(dxNext*dxNext + dyNext*dyNext); 155 156 156 if (lenNext < 1e 3) {157 if (lenNext < 1e11) { 157 158 lenNext = 1; // value does not matter, because dy_next and dx_next is 0 158 159 } 159 160 160 double xCurrent0 = current.getInViewX() + offset * dyNext / lenNext; 161 double yCurrent0 = current.getInViewY()  offset * dxNext / lenNext; 161 // calculate the position of the translated current point 162 double om = offset / lenNext; 163 double xCurrent0 = xCurrent + om * dyNext; 164 double yCurrent0 = yCurrent  om * dxNext; 162 165 163 166 if (idx == 0) { … … 168 171 return mapState.getForView(xCurrent0, yCurrent0); 169 172 } else { 170 double dxPrev = current.getInViewX()  prev.getInViewX(); 171 double dyPrev = current.getInViewY()  prev.getInViewY(); 172 173 double dxPrev = xCurrent  prev.getInViewX(); 174 double dyPrev = yCurrent  prev.getInViewY(); 173 175 // determine intersection of the lines parallel to the two segments 174 176 double det = dxNext*dyPrev  dxPrev*dyNext; 175 176 if (Utils.equalsEpsilon(det, 0)) { 177 double m = dxNext*(yCurrent0  yPrev0)  dyNext*(xCurrent0  xPrev0); 178 179 if (Utils.equalsEpsilon(det, 0)  Math.signum(det) != Math.signum(m)) { 177 180 ++idx; 178 181 prev = current; … … 182 185 } 183 186 184 double m = dxNext*(yCurrent0  yPrev0)  dyNext*(xCurrent0  xPrev0); 185 186 double cx = xPrev0 + m * dxPrev / det; 187 double cy = yPrev0 + m * dyPrev / det; 187 double f = m / det; 188 if (f < 0) { 189 ++idx; 190 prev = current; 191 xPrev0 = xCurrent0; 192 yPrev0 = yCurrent0; 193 return mapState.getForView(xCurrent0, yCurrent0); 194 } 195 // the position of the intersection or intermittent point 196 double cx = xPrev0 + f * dxPrev; 197 double cy = yPrev0 + f * dyPrev; 198 199 if (f > 1) { 200 // check if the intersection point is too far away, this will happen for sharp angles 201 double dxI = cx  xCurrent; 202 double dyI = cy  yCurrent; 203 double lenISq = dxI * dxI + dyI * dyI; 204 205 if (lenISq > Math.abs(2 * offset * offset)) { 206 // intersection point is too far away, calculate intermittent points for capping 207 double dxPrev0 = xCurrent0  xPrev0; 208 double dyPrev0 = yCurrent0  yPrev0; 209 double lenPrev0 = Math.sqrt(dxPrev0 * dxPrev0 + dyPrev0 * dyPrev0); 210 f = 1 + Math.abs(offset / lenPrev0); 211 double cxCap = xPrev0 + f * dxPrev; 212 double cyCap = yPrev0 + f * dyPrev; 213 xPrev0 = cxCap; 214 yPrev0 = cyCap; 215 // calculate a virtual prev point which lies on a line that goes through current and 216 // is perpendicular to the line that goes through current and the intersection 217 // so that the next capping point is calculated with it. 218 double lenI = Math.sqrt(lenISq); 219 double xv = xCurrent + dyI / lenI; 220 double yv = yCurrent  dxI / lenI; 221 222 prev = mapState.getForView(xv, yv); 223 return mapState.getForView(cxCap, cyCap); 224 } 225 } 188 226 ++idx; 189 227 prev = current;
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