C++ 判断线段和矩形是否相交

public static bool isLineIntersectRectangle(float linePointX1,
                                      float linePointY1,
                                      float linePointX2,
                                      float linePointY2,
                                      float rectangleLeftTopX,
                                      float rectangleLeftTopY,
                                      float rectangleRightBottomX,
                                      float rectangleRightBottomY)
    {
        float lineHeight = linePointY1 - linePointY2;
        float lineWidth = linePointX2 - linePointX1;  // 计算叉乘 
        float c = linePointX1 * linePointY2 - linePointX2 * linePointY1;
        if ((lineHeight * rectangleLeftTopX + lineWidth * rectangleLeftTopY + c >= 0 && lineHeight * rectangleRightBottomX + lineWidth * rectangleRightBottomY + c <= 0)
            || (lineHeight * rectangleLeftTopX + lineWidth * rectangleLeftTopY + c <= 0 && lineHeight * rectangleRightBottomX + lineWidth * rectangleRightBottomY + c >= 0)
            || (lineHeight * rectangleLeftTopX + lineWidth * rectangleRightBottomY + c >= 0 && lineHeight * rectangleRightBottomX + lineWidth * rectangleLeftTopY + c <= 0)
            || (lineHeight * rectangleLeftTopX + lineWidth * rectangleRightBottomY + c <= 0 && lineHeight * rectangleRightBottomX + lineWidth * rectangleLeftTopY + c >= 0))
        {
 
            if (rectangleLeftTopX > rectangleRightBottomX)
            {
                float temp = rectangleLeftTopX;
                rectangleLeftTopX = rectangleRightBottomX;
                rectangleRightBottomX = temp;
            }
            if (rectangleLeftTopY < rectangleRightBottomY)
            {
                float temp1 = rectangleLeftTopY;
                rectangleLeftTopY = rectangleRightBottomY;
                rectangleRightBottomY = temp1;
            }
            if ((linePointX1 < rectangleLeftTopX && linePointX2 < rectangleLeftTopX)
                || (linePointX1 > rectangleRightBottomX && linePointX2 > rectangleRightBottomX)
                || (linePointY1 > rectangleLeftTopY && linePointY2 > rectangleLeftTopY)
                || (linePointY1 < rectangleRightBottomY && linePointY2 < rectangleRightBottomY))
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        else
        {
            return false;
        } 
    }