diff --git a/src/org/ntlab/deltaViewer/DeltaViewer.java b/src/org/ntlab/deltaViewer/DeltaViewer.java
index 6781893..0288507 100644
--- a/src/org/ntlab/deltaViewer/DeltaViewer.java
+++ b/src/org/ntlab/deltaViewer/DeltaViewer.java
@@ -1626,7 +1626,19 @@
 					double ey = state.getAbsolutePoint(3).getY();
 					Path2D.Double p = new Path2D.Double();
 					p.moveTo((int) sx, (int) sy);
-					p.curveTo((int) tx1, (int) sy, (int) tx2, (int) ty2, (int) ex, (int) ey);
+					p.quadTo((int) tx2, (int) ty2, (int) ex, (int) ey);
+//					p.curveTo((int) tx1, (int) ty1, (int) tx2, (int) ty2, (int) ex, (int) ey);
+					canvas.getGraphics().draw(p);
+				} else if (state.getAbsolutePointCount() == 3) {
+					double sx = state.getAbsolutePoint(0).getX();
+					double sy = state.getAbsolutePoint(0).getY();
+					double tx = state.getAbsolutePoint(1).getX();
+					double ty = state.getAbsolutePoint(1).getY();
+					double ex = state.getAbsolutePoint(2).getX();
+					double ey = state.getAbsolutePoint(2).getY();
+					Path2D.Double p = new Path2D.Double();
+					p.moveTo((int) sx, (int) sy);
+					p.quadTo((int) tx, (int) ty, (int) ex, (int) ey);
 					canvas.getGraphics().draw(p);
 				}
 			}