diff --git a/ArchitectureColoredPainting/CubicBezier.cpp b/ArchitectureColoredPainting/CubicBezier.cpp
index d9e4caf..2ca4425 100644
--- a/ArchitectureColoredPainting/CubicBezier.cpp
+++ b/ArchitectureColoredPainting/CubicBezier.cpp
@@ -4,7 +4,7 @@ double CubicBezier::getLineValueByT(double t, bool isY) {
 	vector<double> p;
 	if (isY) p = vY;
 	else p = vX;
-	float pt = 1 - t;
+	double pt = 1 - t;
 	return pt * pt * pt * p[0] + 3 * t * pt * pt * p[1] + 3 * t * t * pt * p[2] + t * t * t * p[3];
 }
 
@@ -106,7 +106,7 @@ int CubicBezier::judgeBoundIntersection(double xy, double l, double r, bool isY)
 		valueBegin = *vY.begin();
 		valueEnd = *vY.rbegin();
 	}
-	if ((valueBegin - xy) * (valueEnd - xy) >= eps) return 0;
+	if ((valueBegin - xy) * (valueEnd - xy) >= 0) return 0;
 	double t = findTByValue(xy, isY);
 	double value = getLineValueByT(t, !isY);
 	if (l <= value && value <= r && fabs(t) > eps && fabs(1 - t) > eps) {
diff --git a/ArchitectureColoredPainting/Line.cpp b/ArchitectureColoredPainting/Line.cpp
index 7a166b4..53a4e02 100644
--- a/ArchitectureColoredPainting/Line.cpp
+++ b/ArchitectureColoredPainting/Line.cpp
@@ -23,7 +23,7 @@ vector<Point> Line::toPointVector() const {
 Point Line::operator[](int index) const {
 	return { vX[index], vY[index] };
 }
-
+ 
 Point Line::getPointByIndex(int index) const {
 	return operator[](index);
 }
@@ -61,7 +61,7 @@ Point Line::getEnd() {
 }
 
 int Line::direction(bool isY) {
-	float valueBegin = *vX.begin(), valueEnd = *vX.rbegin();
+	double valueBegin = *vX.begin(), valueEnd = *vX.rbegin();
 	if (isY) {
 		valueBegin = *vY.begin();
 		valueEnd = *vY.rbegin();
diff --git a/ArchitectureColoredPainting/ShortCutTree.cpp b/ArchitectureColoredPainting/ShortCutTree.cpp
index 5eed0b1..94c3ecd 100644
--- a/ArchitectureColoredPainting/ShortCutTree.cpp
+++ b/ArchitectureColoredPainting/ShortCutTree.cpp
@@ -210,7 +210,7 @@ void ShortCutTree::spliteToShortCutTree() {
 			}
 			else {
 				ShortCutNode seTreeNode, swTreeNode;
-				float xMid = (nowTreeNode.bound.x() + nowTreeNode.bound.z()) / 2;
+				float xMid = (nowTreeNode.bound.x() + nowTreeNode.bound.z()) / 2+1e-5;
 				seTreeNode.bound = QVector4D(xMid, nowTreeNode.bound.y(), nowTreeNode.bound.z(), yMid);
 				isDivided |= handleShortCutNode(nowTreeNode, seTreeNode, segment.first, generatedTreeNodes, sumIncrement);
 				swTreeNode.bound = QVector4D(nowTreeNode.bound.x(), nowTreeNode.bound.y(), xMid, yMid);
diff --git a/ArchitectureColoredPainting/StraightLine.cpp b/ArchitectureColoredPainting/StraightLine.cpp
index 3a609f1..606e4af 100644
--- a/ArchitectureColoredPainting/StraightLine.cpp
+++ b/ArchitectureColoredPainting/StraightLine.cpp
@@ -1,7 +1,7 @@
 #include "StraightLine.h"
 
 double StraightLine::getLineValueByT(double t, bool isY) {
-	float valueBegin, valueEnd;
+	double valueBegin, valueEnd;
 	if (isY) {
 		valueBegin = *vY.begin();
 		valueEnd = *vY.rbegin();
@@ -16,11 +16,11 @@ double StraightLine::getLineValueByT(double t, bool isY) {
 double StraightLine::findTByValue(double value, bool isY) {
 	Point pointBegin = getPointByIndex(0), pointEnd = getPointByIndex(1);
 	if (!isY) {
-		if(fabs(pointBegin.x - pointEnd.x) <= eps) return 0;
+		if(fabs(pointBegin.x - pointEnd.x) <= eps) return 0.0;
 		return (value - pointBegin.x) / (pointEnd.x - pointBegin.x);
 	}
 	else {
-		if (fabs(pointBegin.y - pointEnd.y) <= eps) return 0;
+		if (fabs(pointBegin.y - pointEnd.y) <= eps) return 0.0;
 		return (value - pointBegin.y) / (pointEnd.y - pointBegin.y);
 	}
 }
@@ -31,10 +31,10 @@ int StraightLine::judgeBoundIntersection(double xy, double l, double r, bool isY
 		swap(pointBegin.x, pointBegin.y);
 		swap(pointEnd.x, pointEnd.y);
 	}
-	if ((pointBegin.x - xy) * (pointEnd.x - xy) >= eps) return 0;
+	if ((pointBegin.x - xy) * (pointEnd.x - xy) >= 0) return 0;
 	if (direction(isY)) {
-		float t = findTByValue(xy, isY);
-		float value = getLineValueByT(t, !isY);
+		double t = findTByValue(xy, isY);
+		double value = getLineValueByT(t, !isY);
 		if (l <= value && value <= r && fabs(t) > eps && fabs(1-t) > eps) {
 			return 1 + direction(isY);
 		}