修改显示停车场的样式，并且现在不用再把xml复制到输出文件夹了

boundary.cpp

@@ -0,0 +1,32 @@
+#include "boundary.h"
+#include <QPainter>
+#include <QEvent>
+
+Boundary::Boundary(const QString &dir, int l, QWidget *parent): QWidget(parent), length(l)
+{
+    if (dir == "horizontal")
+        vertical = false;
+    else
+        vertical = true;
+    if (vertical) {
+        resize(5, length);
+        setMaximumSize(5, length);
+        setMinimumSize(5, length);
+    } else {
+        resize(length, 5);
+        setMaximumSize(length, 5);
+        setMinimumSize(length, 5);
+    }
+}
+
+void Boundary::paintEvent(QPaintEvent *) {
+    QPainter p(this);
+    p.setPen(Qt::black);
+    p.setBrush(Qt::black);
+    if (vertical) {
+        p.drawRect(0, 0, 5, length);
+    } else {
+        p.drawRect(0, 0, length, 5);
+    }
+    p.setPen(Qt::red);
+}