pClientDC->Rectangle(rect); rect.left -= 5; rect.right += 5; rect.top -= 5; rect.bottom += 5; pClientDC->SelectObject(&pen); pClientDC->Rectangle(rect); pen.DeleteObject(); pen0.DeleteObject(); pClientDC->DeleteDC();

这是一个 MFC 程序中的对话框类的成员函数，用于在指定控件周围绘制一个带有白边框的矩形。首先调用 CDC 对象的 Rectangle() 函数在客户区中绘制一个矩形，矩形的位置和大小由 rect 对象指定。接着通过修改 rect 对象的左、右、上、下四个边界值，将矩形扩大 5 个逻辑单位，以便绘制白色边框。然后调用 SelectObject() 函数将黑色画笔对象选入设备上下文对象中，用于绘制边框。再次调用 Rectangle() 函数绘制带有黑色边框的矩形。接着调用 DeleteObject() 函数删除画笔对象，释放资源。最后调用 DeleteDC() 函数删除设备上下文对象，释放资源。

相关问题

!pip install matplotlib import matplotlib.pyplot as plt from matplotlib.patches import Rectangle fig, ax = plt.subplots(figsize=(8, 6)) ax.set_xlim(0, 10) ax.set_ylim(0, 10) ax.axis('off') # UE端发起释放EPS承载 rect_ue = Rectangle((1, 9), 2, 1, linewidth=1, edgecolor='black', facecolor='white') ax.add_patch(rect_ue) ax.text(1.5, 9.5, 'UE\nRelease\nEPS\nBearer', ha='center', va='center') # RRC连接释放 rect_rrc = Rectangle((4, 9), 2, 1, linewidth=1, edgecolor='black', facecolor='white') ax.add_patch(rect_rrc) ax.text(4.5, 9.5, 'RRC\nConnection\nRelease', ha='center', va='center') # Detach请求 rect_detach = Rectangle((7, 9), 2, 1, linewidth=1, edgecolor='black', facecolor='white') ax.add_patch(rect_detach) ax.text(8, 9.5, 'Detach\nRequest', ha='center', va='center') # 信令Attach success/connection success等信令 rect_attach = Rectangle((1, 5), 2, 1, linewidth=1, edgecolor='black', facecolor='white') ax.add_patch(rect_attach) ax.text(1.5, 5.5, 'Attach\nSuccess', ha='center', va='center') rect_conn = Rectangle((4, 5), 2, 1, linewidth=1, edgecolor='black', facecolor='white') ax.add_patch(rect_conn) ax.text(4.5, 5.5, 'Connection\nSuccess', ha='center', va='center') # 释放EPS承载完成 rect_done = Rectangle((7, 5), 2, 1, linewidth=1, edgecolor='black', facecolor='white') ax.add_patch(rect_done) ax.text(8, 5.5, 'Release\nDone', ha='center', va='center') # UE端发起释放EPS承载 -> RRC连接释放 ax.annotate('', xy=(3, 9.5), xytext=(4, 9.5), arrowprops=dict(arrowstyle='->')) # RRC连接释放 -> Detach请求 ax.annotate('', xy=(6, 9.5), xytext=(7, 9.5), arrowprops=dict(arrowstyle='->')) # Detach请求 -> 信令Attach success/connection success等信令 ax.annotate('', xy=(1, 8), xytext=(1, 5.5), arrowprops=dict(arrowstyle='->')) ax.annotate('', xy=(4, 8), xytext=(4, 5.5), arrowprops=dict(arrowstyle='->')) # 信令Attach success/connection success等信令 -> 释放EPS承载完成 ax.annotate('', xy=(3, 5.5), xytext=(7, 5.5), arrowprops=dict(arrowstyle='->')) plt.show()，这段代码画出来的图比例不太对，请调整

可以尝试添加以下代码调整图像大小比例：

fig.subplots_adjust(left=0, right=1, bottom=0, top=1)

完整代码如下：

!pip install matplotlib 
import matplotlib.pyplot as plt 
from matplotlib.patches import Rectangle  

fig, ax = plt.subplots(figsize=(8, 6))
ax.set_xlim(0, 10)
ax.set_ylim(0, 10)
ax.axis('off')

# UE端发起释放EPS承载
rect_ue = Rectangle((1, 9), 2, 1, linewidth=1, edgecolor='black', facecolor='white')
ax.add_patch(rect_ue)
ax.text(1.5, 9.5, 'UE\nRelease\nEPS\nBearer', ha='center', va='center')

# RRC连接释放
rect_rrc = Rectangle((4, 9), 2, 1, linewidth=1, edgecolor='black', facecolor='white')
ax.add_patch(rect_rrc)
ax.text(4.5, 9.5, 'RRC\nConnection\nRelease', ha='center', va='center')

# Detach请求
rect_detach = Rectangle((7, 9), 2, 1, linewidth=1, edgecolor='black', facecolor='white')
ax.add_patch(rect_detach)
ax.text(8, 9.5, 'Detach\nRequest', ha='center', va='center')

# 信令Attach success/connection success等信令
rect_attach = Rectangle((1, 5), 2, 1, linewidth=1, edgecolor='black', facecolor='white')
ax.add_patch(rect_attach)
ax.text(1.5, 5.5, 'Attach\nSuccess', ha='center', va='center')
rect_conn = Rectangle((4, 5), 2, 1, linewidth=1, edgecolor='black', facecolor='white')
ax.add_patch(rect_conn)
ax.text(4.5, 5.5, 'Connection\nSuccess', ha='center', va='center')

# 释放EPS承载完成
rect_done = Rectangle((7, 5), 2, 1, linewidth=1, edgecolor='black', facecolor='white')
ax.add_patch(rect_done)
ax.text(8, 5.5, 'Release\nDone', ha='center', va='center')

# UE端发起释放EPS承载 -> RRC连接释放
ax.annotate('', xy=(3, 9.5), xytext=(4, 9.5), arrowprops=dict(arrowstyle='->'))

# RRC连接释放 -> Detach请求
ax.annotate('', xy=(6, 9.5), xytext=(7, 9.5), arrowprops=dict(arrowstyle='->'))

# Detach请求 -> 信令Attach success/connection success等信令
ax.annotate('', xy=(1, 8), xytext=(1, 5.5), arrowprops=dict(arrowstyle='->'))
ax.annotate('', xy=(4, 8), xytext=(4, 5.5), arrowprops=dict(arrowstyle='->'))

# 信令Attach success/connection success等信令 -> 释放EPS承载完成
ax.annotate('', xy=(3, 5.5), xytext=(7, 5.5), arrowprops=dict(arrowstyle='->'))

fig.subplots_adjust(left=0, right=1, bottom=0, top=1)
plt.show()

如何实时的对this.rectangle = new fabric.Rect监控,禁止rect的坐标,超出canvas的大小范围

您可以使用fabric.js提供的`object:moving`事件来监控矩形对象的移动，并在移动时检查其位置是否超出了canvas的边界。可以在`object:moving`事件处理程序中添加以下代码：

this.rectangle.on('object:moving', function(e) {
  var obj = e.target;
  var canvas = obj.canvas;
  var boundingRect = obj.getBoundingRect();
  
  // 检查是否超出左上角边界
  if (boundingRect.top < 0 || boundingRect.left < 0) {
    obj.top = Math.max(obj.top, 0);
    obj.left = Math.max(obj.left, 0);
    obj.setCoords();
  }
  
  // 检查是否超出右下角边界
  if (boundingRect.top + boundingRect.height > canvas.height || boundingRect.left + boundingRect.width > canvas.width) {
    obj.top = Math.min(obj.top, canvas.height - boundingRect.height);
    obj.left = Math.min(obj.left, canvas.width - boundingRect.width);
    obj.setCoords();
  }
});

这段代码会在矩形对象移动时监控其位置，并在其位置超出canvas的边界时将其强制限制在canvas范围内。