概述
1. 使用Rectangle结构体的方法
private void MethodsMenu_Click(object sender,
System.EventArgs e)
{
// Create a Graphics object
Graphics g = this.CreateGraphics();
// Create a Point & Size
PointF pt = new PointF( 30.8f , 20.7f );
SizeF sz = new SizeF( 60.0f , 40.0f );
// Create two rectangles
RectangleF rect1 = new RectangleF(pt, sz);
RectangleF rect2 =
new RectangleF( 40.2f , 40.6f , 100.5f , 100.0f );
// Ceiling a rectangle
Rectangle rect3 = Rectangle.Ceiling(rect1);
// Truncate a rectangle
Rectangle rect4 = Rectangle.Truncate(rect1);
// Round a rectangle
Rectangle rect5 = Rectangle.Round(rect2);
// Draw rectangles
g.DrawRectangle(Pens.Black, rect3);
g.DrawRectangle(Pens.Red, rect5);
// Intersect a rectangle 交集
Rectangle isectRect =
Rectangle.Intersect(rect3, rect5);
// Fill rectangle
g.FillRectangle(
new SolidBrush(Color.Blue), isectRect);
// Inflate a recntangle
Size inflateSize = new Size(0, 40);
isectRect.Inflate(inflateSize);
// Draw rectangle
g.DrawRectangle(Pens.Blue, isectRect);
// Empty rectangle and set its properties
rect4 = Rectangle.Empty;
rect4.Location = new Point(50, 50);
rect4.X = 30;
rect4.Y = 40;
// Union rectangles 并集
Rectangle unionRect =
Rectangle.Union(rect4, rect5);
// Draw rectangle
g.DrawRectangle(Pens.Green, unionRect);
// Displose
g.Dispose();
}
2. Contains方法用于确定一个矩形或一个点是否在当前矩形的内部。如果在，Contains方法返回true，否则false。
确定单击鼠标的位置是否在一个矩形内部。我们将检查以确定单击的是否是鼠标左键，然后创建一个矩形，并生产一条消息（如何单击了鼠标左键）。
private void Form1_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
{
if(e.Button == MouseButtons.Left)
{
if (bigRect.Contains( new Point(e.X, e.Y)) )
MessageBox.Show("Clicked inside rectangle");
else
MessageBox.Show("Clicked outside rectangle");
}
}
//MouseEventArgs枚举提供了可用于确定鼠标单击位置的成员，其中包括Left、Middle、None、Right、Xbutton1和Xbutton2。
3. Region类
区域是指一个封闭图形或窗体的内部。一个窗体有两个区，即一个非工作区，一个工作区。非工作区不允许绘图，它包括标题栏以及水平滚动条和垂直滚动条。
Region类没有属性，在构造了一个区域之后，应用程序可以使用Graphics类的FillRegion方法来填充此区域。
Region方法：
u Complement方法：将区域更新为一个矩形的不与此区域相交的部分
private void menuItem7_Click(object sender, System.EventArgs e)
{
// Create a Graphics
Graphics g = this.CreateGraphics();
// Create two Rectangles
Rectangle rect1 = new Rectangle(20, 20, 60, 80);
Rectangle rect2 = new Rectangle(50, 30, 60, 80);
// Create two Regions
Region rgn1 = new Region(rect1);
Region rgn2 = new Region(rect2);
// Draw rectangles
g.DrawRectangle(Pens.Green, rect1);
g.DrawRectangle(Pens.Black, rect2);
// Complement can take a Rectangle, RectangleF,
// Region or a GraphicsPath as an argument
rgn1.Complement(rgn2);
// rgn1.Complement(rect2);
g.FillRegion(Brushes.Blue, rgn1);
// Dispose
g.Dispose();
}
u IsEmpty 和 IsInfinite方法：IsEmpty是否区域为空。IsInfinite是否区域具有无限内部。
private void menuItem8_Click(object sender, System.EventArgs e)
{
// Create a Graphics object
Graphics g = this.CreateGraphics();
g.Clear(this.BackColor);
// Create Rectangles and Regions
Rectangle rect1 =
new Rectangle(20, 20, 60, 80);
Rectangle rect2 =
new Rectangle(50, 30, 60, 80);
Region rgn1 = new Region(rect1);
Region rgn2 = new Region(rect2);
// If Region is not empty, empty it
if (! rgn1.IsEmpty(g))
rgn1.MakeEmpty();
// If Region is not infinite, infinite
// it
if (! rgn2.IsInfinite(g))
rgn2.MakeInfinite();
// Get bounds of the infinite region
RectangleF rect = rgn2.GetBounds(g);
// Display
MessageBox.Show(rect.ToString());
// Fill the region
g.FillRegion(Brushes.Red, rgn2);
// Dispose
g.Dispose();
}
u Exclude方法：将此区域更新为区域内部不与一个矩形相交的部分。
private void menuItem9_Click(object sender, System.EventArgs e)
{
// Create Graphics object
Graphics g = this.CreateGraphics();
g.Clear(this.BackColor);
// Create Rectangles
Rectangle rect1 = new Rectangle(20, 20, 60, 80);
Rectangle rect2 = new Rectangle(50, 30, 60, 80);
// Create Regions
Region rgn1 = new Region(rect1);
Region rgn2 = new Region(rect2);
// Draw rectangles
g.DrawRectangle(Pens.Green, rect1);
g.DrawRectangle(Pens.Black, rect2);
// Exclued the region
rgn1.Exclude(rgn2);
// Fill region after exclude
g.FillRegion(Brushes.Blue, rgn1);
// Dispose
g.Dispose();
}
u Union方法：将此区域更新为它与给定图形路径的幷集。
private void menuItem10_Click(object sender, System.EventArgs e)
{
Graphics g = this.CreateGraphics();
g.Clear(this.BackColor);
Rectangle rect1 = new Rectangle(20, 20, 60, 80);
Rectangle rect2 = new Rectangle(50, 30, 60, 80);
Region rgn1 = new Region(rect1);
Region rgn2 = new Region(rect2);
g.DrawRectangle(Pens.Green, rect1);
g.DrawRectangle(Pens.Black, rect2);
// Complement can take a Rectangle, RectangleF,
// Region or a GraphicsPath as an argument
rgn1.Union(rgn2);
// rgn1.Complement(rect2);
g.FillRegion(Brushes.Blue, rgn1);
// Dispose
g.Dispose();
}
u Xor方法：将此区域更新为它与给定图形路径的幷集再减去交集。
private void menuItem11_Click(object sender, System.EventArgs e)
{
// Create Graphics object
Graphics g = this.CreateGraphics();
g.Clear(this.BackColor);
// Create Rectangles
Rectangle rect1 = new Rectangle(20, 20, 60, 80);
Rectangle rect2 = new Rectangle(50, 30, 60, 80);
// Create Regions
Region rgn1 = new Region(rect1);
Region rgn2 = new Region(rect2);
// Draw Rectangles
g.DrawRectangle(Pens.Green, rect1);
g.DrawRectangle(Pens.Black, rect2);
// Xoring two regions
rgn1.Xor(rgn2);
// Fill the region after Xoring
g.FillRegion(Brushes.Blue, rgn1);
// Dispose
g.Dispose();
}
u Intersect方法：将此区域更新为它与给定图形路径的交集。
private void menuItem12_Click(object sender, System.EventArgs e)
{
Graphics g = this.CreateGraphics();
g.Clear(this.BackColor);
Rectangle rect1 = new Rectangle(20, 20, 60, 80);
Rectangle rect2 = new Rectangle(50, 30, 60, 80);
Region rgn1 = new Region(rect1);
Region rgn2 = new Region(rect2);
g.DrawRectangle(Pens.Green, rect1);
g.DrawRectangle(Pens.Black, rect2);
// Complement can take a Rectangle, RectangleF,
// Region or a GraphicsPath as an argument
rgn1.Intersect(rgn2);
// rgn1.Complement(rect2);
g.FillRegion(Brushes.Blue, rgn1);
// Dispose
g.Dispose();
}
最后
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