form1.cs

这是《C#图形程序设计》这本书的源代码

					for(x=-180;x<=180;x+=2)
					{
						y=a*x*(x-x0)*(x+x0)*(x-x2)*(x+x2);
						px=(int)(200+x/2+xx);
						py=(int)(160-y+yy);
						px=(int)(px*0.8);
						py=(int)(py*0.8);
						if(x==-180)
						{
							p1.X=px;
							p1.Y=py;
						}
						else
						{
							p2.X=px;
							p2.Y=py;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem5_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int px,py;
			double yy,a,x,y,x1,y1,x0,x2;
			x0=160;
			x1=180;
			y1=120;
			x2=80;
			a=y1/(x1*(x1-x0)*(x1+x0)*(x1-x2)*(x1+x2));
			
			for(yy=-60;yy<=60;yy+=5)
			{
				for(x=-180;x<=180;x+=2)
				{
					y=a*x*(x-x0)*(x+x0)*(x-x2)*(x+x2);
					px=(int)(300+x);
					py=(int)(240-y+yy);
					px=(int)(px/2);
					py=(int)(py/2);
					if(x==-180)
					{
						p1.X=px;
						p1.Y=py;
					}
					else
					{
						p2.X=px;
						p2.Y=py;
						g.DrawLine(pen1,p1,p2);
						p1=p2;
					}
				}
			}
		}

		private void menuItem6_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			double d,t,al,PI,x1,y1;
			int x,y,r,px,py;
			PI=3.14159;
			r=30;
			for(px=40;px<=300;px+=60)
			{
				for(py=40;py<=220;py+=50)
				{
					for(al=0;al<=2*PI;al+=PI/16)
					{
						d=r*(1+0.2*Math.Sin(12*al));
						t=d*(0.5+0.5*Math.Sin(4*al));
						x1=t*Math.Cos(al);
						y1=-t*Math.Sin(al);
						x=px+(int)(x1);
						y=py+(int)(y1);
						if(al==0)
						{
							p1.X=x;
							p1.Y=y;
						}
						else
						{
							p2.X=x;
							p2.Y=y;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem7_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int px,py,i;
			double xx,yy,a,x,y,x1,y1,x0;
			x0=120;
			x1=180;
			y1=120;
			a=y1/(x1*(x1-x0)*(x1+x0));
			i=1;
			for(yy=-100;yy<=100;yy+=75)
			{
				i=i+1;
				for(xx=-50;xx<=50;xx+=5)
				{
					for(x=-180;x<=180;x+=2)
					{
						y=a*x*(x-x0)*(x+x0);
						px=(int)(180+x/2+xx/2);
						py=(int)(200-y+yy);
						px=(int)(px/2);
						py=(int)(py/2);
						if(x==-180)
						{
							p1.X=px;
							p1.Y=py;
						}
						else
						{
							p2.X=px;
							p2.Y=py;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem9_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int px,py;
			double a,x,y,x1,y1,x0,th;
			x0=120;
			x1=180;
			y1=120;
			th=0.6;
			a=y1/(x1*(x1-x0)*(x1+x0));
			for(x=-180;x<=180;x+=2)
			{
				y=a*x*(x-x0)*(x+x0);
				px=(int)(300+x/2);
				py=(int)(40-y);
				px=(int)(px*Math.Cos(th)-py*Math.Sin(th));
				py=(int)(px*Math.Sin(th)+py*Math.Cos(th));
				if(x==-180)
				{
					p1.X=px;
					p1.Y=py;
				}
				else
				{
					p2.X=px;
					p2.Y=py;
					g.DrawLine(pen1,p1,p2);
					p1=p2;
				}
			}
		}


		private void menuItem13_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int x,y;
			double al,t,a,x1,y1,x2,y2,px,py;
			const double PI=3.1416;
			t=Math.Sqrt(170*170*2.0);
			for(px=-170;px<=170;px+=20)
			{
				for(py=-170;py<=170;py+=20)
				{
					a=Math.Sqrt(px*px+py*py)/t*PI/2+PI/4;
					for(al=0;al<=2*PI;al+=PI/2)
					{
						x1=10*Math.Cos(al);
						y1=10*Math.Sin(al);
						//使用变换公式如下：
						x2=x1*Math.Cos(a)-y1*Math.Sin(a);
						y2=x1*Math.Sin(a)+y1*Math.Cos(a);
						x=(int)(px+300+x2);
						y=(int)(py+300-y2);
						x=(int)(x/2);
						y=(int)(y/2);
						if(al==0)
						{
							p1.X=x;
							p1.Y=y;
						}
						else
						{
							p2.X=x;
							p2.Y=y;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem14_Click(object sender, System.EventArgs e)
		{
			//将程序中的a改为：
			//a=Math.Sqrt(px*px)/t*PI/2
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int x,y;
			double al,t,a,x1,y1,x2,y2,px,py;
			const double PI=3.1416;
			t=Math.Sqrt(170*170*2.0);
			for(px=-170;px<=170;px+=20)
			{
				for(py=-170;py<=170;py+=20)
				{
					a=Math.Sqrt(px*px)/t*PI/2;
					for(al=0;al<=2*PI;al+=PI/2)
					{
						x1=10*Math.Cos(al);
						y1=10*Math.Sin(al);
						x2=x1*Math.Cos(a)-y1*Math.Sin(a);
						y2=x1*Math.Sin(a)+y1*Math.Cos(a);
						x=(int)(px+300+x2);
						y=(int)(py+300-y2);
						x=(int)(x/2);
						y=(int)(y/2);
						if(al==0)
						{
							p1.X=x;
							p1.Y=y;
						}
						else
						{
							p2.X=x;
							p2.Y=y;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem15_Click(object sender, System.EventArgs e)
		{
			//将程序中的a改为：
			//a=px/t*PI/2+PI/4
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int x,y;
			double al,t,a,x1,y1,x2,y2,px,py;
			const double PI=3.1416;
			t=Math.Sqrt(170*170*2.0);
			for(px=-170;px<=170;px+=20)
			{
				for(py=-170;py<=170;py+=20)
				{
					a=px/t*PI/2+PI/4;
					for(al=0;al<=2*PI;al+=PI/2)
					{
						x1=10*Math.Cos(al);
						y1=10*Math.Sin(al);
						x2=x1*Math.Cos(a)-y1*Math.Sin(a);
						y2=x1*Math.Sin(a)+y1*Math.Cos(a);
						x=(int)(px+300+x2);
						y=(int)(py+300-y2);
						x=(int)(x/2);
						y=(int)(y/2);
						if(al==0)
						{
							p1.X=x;
							p1.Y=y;
						}
						else
						{
							p2.X=x;
							p2.Y=y;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem11_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int px,py;
			double a,x,y,x1,y1,x0;
			x0=120;
			x1=180;
			y1=120;
			a=y1/(x1*(x1-x0)*(x1+x0));
			for(x=-180;x<=180;x+=2)
			{
				y=a*x*(x-x0)*(x+x0);
				px=(int)(320+x/2);
				py=(int)(160-y);
				px=(int)(px/2);
				py=(int)(py/2);
				if(x==-180)
				{
					p1.X=px;
					p1.Y=py;
				}
				else
				{
					p2.X=px;
					p2.Y=py;
					g.DrawLine(pen1,p1,p2);
					p1=p2;
				}
			}
			for(x=-180;x<=180;x+=2)
			{
				y=a*x*(x-x0)*(x+x0);
				px=(int)(320-x/2);
				py=(int)(460-y);
				px=(int)(px/2);
				py=(int)(py/2);
				if(x==-180)
				{
					p1.X=px;
					p1.Y=py;
				}
				else
				{
					p2.X=px;
					p2.Y=py;
					g.DrawLine(pen1,p1,p2);
					p1=p2;
				}
			}
		}

		private void menuItem12_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int i,px,py,x2,y2;
			double xx,yy,a,x,y,x1,y1,x0,th;
			x0=120;
			x1=180;
			y1=120;
			th=0.4;
			a=y1/(x1*(x1-x0)*(x1+x0));
			i=1;
			for(yy=-100;yy<=100;yy+=75)
			{
				i=i+1;
				for(xx=-50;xx<=50;xx+=5)
				{
					for(x=-180;x<=180;x+=2)
					{
						y=a*x*(x-x0)*(x+x0);
						px=(int)(240+x/2+xx/2);
						py=(int)(100-y+yy);
						x2=(int)(px*Math.Cos(th)-py*Math.Sin(th));
						y2=(int)(px*Math.Sin(th)+py*Math.Cos(th));
						if(x==-180)
						{
							p1.X=x2;
							p1.Y=y2;
						}
						else
						{
							p2.X=x2;
							p2.Y=y2;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem18_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int a,cx,cy,z,x2,y2;
			double d,x,y,al;
			const double PI=3.14159;
			a=30;
			d=0.0;
			for(cx=100;cx<=500;cx=cx+200)
			{
				for(cy=100;cy<=300;cy=cy+150)
				{
					d=d+0.5;
					for(z=-90;z<=90;z=z+5)
					{
						x=z;
						al=(z+90)*2*PI/180;
						y=a*Math.Sin(al)*Math.Sin(d*al);
						x2=(int)(cx+x);
						y2=(int)(cy-y);
						if(z==-90)
						{
							p1.X=x2;
							p1.Y=y2;
						}
						else
						{
							p2.X=x2;
							p2.Y=y2;
							g.DrawLine(pen1,p1,p2);
							p1=p2;
						}
					}
				}
			}
		}

		private void menuItem19_Click(object sender, System.EventArgs e)
		{
			Graphics g=pictureBox1.CreateGraphics();
			Pen pen1=new Pen(Color.Blue);
			g.Clear(pictureBox1.BackColor);
			int a,cx,cy,z,x2,y2,x3,y3,cx1,cy1,z1;
			double d,x,y,al,a0,x0,y0,d1;
			const double PI=3.14159;
			a=30;d=0.0;d1=0.0;
			for(cx=100;cx<=500;cx=cx+200)
				for(cy=100;cy<=300;cy=cy+150)
				{
					d=d+0.5;
					for(z=-90;z<=90;z=z+5)
					{
						x=z;
						al=(z+90)*2*PI/180;
						y=a*Math.Sin(al)*Math.Sin(d*al);
						x2=(int)(cx+x);
						y2=(int)(cy-y);
						if(z==-90)
						{
							p1.X=x2;p1.Y=y2;
						}