1.等边三角形
1.1 概述
1.2 代码
using System;
using System.Drawing;
using System.Windows.Forms;
public partial class TriangleForm : Form
{
public TriangleForm()
{
//InitializeComponent();
// 确保窗体大小足够大,以容纳三角形
this.ClientSize = new Size(300, 300);
this.DoubleBuffered = true; // 启用双缓冲,以减少绘图时的闪烁
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// 定义三角形的大小和位置
int sideLength = 100; // 等边三角形外接圆的半径
int centerX = this.ClientSize.Width / 2; // 三角形中心点的X坐标
int centerY = this.ClientSize.Height / 2; // 三角形中心点的Y坐标
// 将30度转换为弧度
double degrees = 30;
double radians = Math.PI * degrees / 180;
double sinValue = Math.Sin(radians);
double cosValue = Math.Cos(radians);
float sinLen = (float)sinValue * sideLength;
float cosLen = (float)cosValue * sideLength;
// 计算三角形顶点的位置
PointF topVertex = new PointF(centerX, centerY - sideLength );
PointF leftVertex = new PointF(centerX - cosLen, centerY + sinLen);
PointF rightVertex = new PointF(centerX + cosLen, centerY + sinLen);
// 创建一个Brush对象来填充三角形
using (SolidBrush brush = new SolidBrush(Color.LightBlue))
{
// 绘制等边三角形
e.Graphics.FillPolygon(brush, new PointF[] { topVertex, leftVertex, rightVertex });
// 如果你还想绘制三角形的边框,可以使用Pen对象
using (Pen pen = new Pen(Color.Black, 2))
{
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex, leftVertex, rightVertex });
}
}
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TriangleForm());
}
}
1.3 运行结果
2 立方体
2.1 概要
立方体是用等边三角型的图转换过来的
2.2 代码
using System;
using System.Drawing;
using System.Windows.Forms;
public partial class TriangleForm : Form
{
public TriangleForm()
{
//InitializeComponent();
// 确保窗体大小足够大,以容纳三角形
this.ClientSize = new Size(300, 300);
this.DoubleBuffered = true; // 启用双缓冲,以减少绘图时的闪烁
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// 定义三角形的大小和位置
int sideLength = 100; // 等边三角形的边长
int centerX = this.ClientSize.Width / 2; // 三角形中心点的X坐标
int centerY = this.ClientSize.Height / 2; // 三角形中心点的Y坐标
// 将30度转换为弧度
double degrees = 30;
double radians = Math.PI * degrees / 180;
double sinValue = Math.Sin(radians);
double cosValue = Math.Cos(radians);
float sinLen = (float)sinValue * sideLength;
float cosLen = (float)cosValue * sideLength;
//中心点
PointF topVertex_center = new PointF(centerX, centerY);
// 计算三角形顶点的位置
PointF topVertex = new PointF(centerX, centerY - cosLen);
PointF topVertex_left = new PointF(centerX - cosLen, centerY - cosLen + sinLen);
PointF leftVertex = new PointF(centerX - cosLen, centerY + sinLen);
PointF topVertex_buttom = new PointF(centerX, centerY + sinLen*2);
PointF rightVertex = new PointF(centerX + cosLen, centerY + sinLen);
PointF topVertex_right = new PointF(centerX + cosLen, centerY - cosLen + sinLen);
// 创建一个Brush对象来填充三角形
using (SolidBrush brush = new SolidBrush(Color.LightBlue))
{
// 绘制等边三角形
//e.Graphics.FillPolygon(brush, new PointF[] { topVertex, leftVertex, rightVertex });
// 如果你还想绘制三角形的边框,可以使用Pen对象
using (Pen pen = new Pen(Color.Black, 2))
{
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex, topVertex_left, leftVertex, topVertex_buttom, rightVertex, topVertex_right });
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex_center, topVertex_left });
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex_center, topVertex_right });
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex_center, topVertex_buttom });
}
}
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TriangleForm());
}
}
2.3 运行结果
3 立方体透视图
3.1 概要
透视图是用前面的立方体,去移动顶点演化出来的
3.2 代码
using System;
using System.Drawing;
using System.Net;
using System.Windows.Forms;
public partial class TriangleForm : Form
{
public TriangleForm()
{
//InitializeComponent();
// 确保窗体大小足够大,以容纳三角形
this.ClientSize = new Size(300, 300);
this.DoubleBuffered = true; // 启用双缓冲,以减少绘图时的闪烁
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// 定义三角形的大小和位置
int sideLength = 100; // 等边三角形的边长
int centerX = this.ClientSize.Width / 2; // 三角形中心点的X坐标
int centerY = this.ClientSize.Height / 2; // 三角形中心点的Y坐标
// 将30度转换为弧度
double degrees = 30;
double radians = Math.PI * degrees / 180;
double sinValue = Math.Sin(radians);
double cosValue = Math.Cos(radians);
float sinLen = (float)sinValue * sideLength;
float cosLen = (float)cosValue * sideLength;
float y_yi = 20;
float x_yi = 10;
//中心点
PointF topVertex_center = new PointF(centerX+ x_yi, centerY- y_yi);
PointF topVertex_center_hou = new PointF(centerX - x_yi, centerY + y_yi);
// 计算三角形顶点的位置
PointF topVertex = new PointF(centerX- x_yi, centerY - cosLen+ y_yi);
PointF topVertex_left = new PointF(centerX - cosLen, centerY - cosLen + sinLen);
PointF leftVertex = new PointF(centerX - cosLen, centerY + sinLen);
PointF topVertex_buttom = new PointF(centerX+ x_yi, centerY + sinLen*2- y_yi);
PointF rightVertex = new PointF(centerX + cosLen, centerY + sinLen);
PointF topVertex_right = new PointF(centerX + cosLen, centerY - cosLen + sinLen);
// 创建一个Brush对象来填充三角形
using (SolidBrush brush = new SolidBrush(Color.LightBlue))
{
// 绘制等边三角形
//e.Graphics.FillPolygon(brush, new PointF[] { topVertex, leftVertex, rightVertex });
// 如果你还想绘制三角形的边框,可以使用Pen对象
using (Pen pen = new Pen(Color.Black, 2))
{
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex, topVertex_left, leftVertex, topVertex_buttom, rightVertex, topVertex_right });
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex_center, topVertex_left });
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex_center, topVertex_right });
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex_center, topVertex_buttom });
}
float[] dashValues = { 50, 5 }; // 虚线由5个像素的实线和5个像素的空白组成
Pen dashedPen = new Pen(Color.Black, 1);
e.Graphics.DrawLine(dashedPen, topVertex_center_hou, leftVertex);
e.Graphics.DrawLine(dashedPen, topVertex_center_hou, rightVertex);
e.Graphics.DrawLine(dashedPen, topVertex_center_hou, topVertex);
}
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TriangleForm());
}
}
3.3 运行结果
4.等边三角形的内切圆和外接圆
4.1 概要
4.2 代码
using System;
using System.Drawing;
using System.Net;
using System.Windows.Forms;
public partial class TriangleForm : Form
{
public TriangleForm()
{
//InitializeComponent();
// 确保窗体大小足够大,以容纳三角形
this.ClientSize = new Size(300, 300);
this.DoubleBuffered = true; // 启用双缓冲,以减少绘图时的闪烁
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// 定义三角形的大小和位置
int sideLength = 100; // 内接圆半径
int centerX = this.ClientSize.Width / 2; // 三角形中心点的X坐标
int centerY = this.ClientSize.Height / 2; // 三角形中心点的Y坐标
// 将30度转换为弧度
double degrees = 30;
double radians = Math.PI * degrees / 180;
double sinValue = Math.Sin(radians);
double cosValue = Math.Cos(radians);
float sinLen = (float)sinValue * sideLength;
float cosLen = (float)cosValue * sideLength;
// 计算三角形顶点的位置
PointF topVertex = new PointF(centerX, centerY - sideLength);
PointF leftVertex = new PointF(centerX - cosLen, centerY + sinLen);
PointF rightVertex = new PointF(centerX + cosLen, centerY + sinLen);
// 设置圆形的边界矩形(位置和大小)
Rectangle rect = new Rectangle(centerX- (int)sinLen, centerY- (int)sinLen, (int)(sinLen*2), (int)(sinLen*2)); // x=50, y=50, 宽度=100, 高度=100
Rectangle rect2 = new Rectangle(centerX - (int)sideLength, centerY - (int)sideLength, sideLength*2, sideLength*2); // x=50, y=50, 宽度=100, 高度=100
// 创建一个Brush对象来填充三角形
using (SolidBrush brush = new SolidBrush(Color.LightBlue))
{
// 绘制等边三角形
//e.Graphics.FillPolygon(brush, new PointF[] { topVertex, leftVertex, rightVertex });
// 如果你还想绘制三角形的边框,可以使用Pen对象
using (Pen pen = new Pen(Color.Black, 2))
{
e.Graphics.DrawPolygon(pen, new PointF[] { topVertex, leftVertex, rightVertex, });
e.Graphics.DrawEllipse(pen, rect2);
e.Graphics.DrawEllipse(pen, rect);
}
}
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TriangleForm());
}
}