请高手介绍下C# winform 绘图编程 请高手介绍下C# winform 绘图编程 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 system.drawinggdi+熟悉下什么是画笔、画刷、调色板、画布等等概念。 使用C#在Windows应用程序里绘图,可能用到移动图像、擦掉图像,调整大小等等。这里有一个画图的小程序,简单的实现了这些(转)定义图像的基类:abstract class DrawBase...{ internal Color m_BackColor; internal Color m_ForeColor; internal static int m_HalfGrab; public static int HalfGrab ...{ get ...{ return DrawBase.m_HalfGrab; } set ...{ DrawBase.m_HalfGrab = value; } } public Color BackColor ...{ get ...{ return m_BackColor; } set ...{ m_BackColor = value; } } public Color ForeColor ...{ get ...{ return m_ForeColor; } set ...{ m_ForeColor = value; } } public abstract Rectangle GetBound(); public abstract void Draw(Graphics g); public abstract bool Near(int x, int y); public abstract void SetBound(Rectangle bound);}定义线:class LineObj:DrawBase...{ private Point m_Start; private Point m_End; public LineObj(Point start, Point end) ...{ this.m_Start = start; this.m_End = end; } public override System.Drawing.Rectangle GetBound() ...{ int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X; int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y; int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X; int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y; return Rectangle.FromLTRB(x, y, r, b); } public override void Draw(System.Drawing.Graphics g) ...{ using (Pen pen = new Pen(this.m_ForeColor)) ...{ g.DrawLine(pen, this.m_Start, this.m_End); } } public override bool Near(int x, int y) ...{ //点到直线的距离是否在抓取范围之内 float A = this.m_End.Y- this.m_Start.Y; float B = this.m_End.X- this.m_Start.X; float C = B * this.m_Start.Y - A * this.m_Start.X; double D = (A * x - B * y + C) / (Math.Sqrt(A * A + B * B)); if (D >= -m_HalfGrab && D <= m_HalfGrab) ...{ RectangleF bounds = this.GetBound(); bounds.Inflate(m_HalfGrab, m_HalfGrab); return bounds.Contains(x, y); } return false; } public override void SetBound(Rectangle bound) ...{ this.m_Start = new Point(bound.X, bound.Y); this.m_End = new Point(bound.Right, bound.Bottom); }}定义矩形:class RectangleObj:DrawBase...{ private Point m_Start; private Point m_End; private bool m_Solid; public RectangleObj(Point start, Point end) ...{ this.m_Start = start; this.m_End = end; } public bool Solid ...{ get ...{ return m_Solid; } set ...{ m_Solid = value; } } public override System.Drawing.Rectangle GetBound() ...{ int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X; int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y; int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X; int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y; return Rectangle.FromLTRB(x, y, r, b); } public override void Draw(Graphics g) ...{ Rectangle bound = this.GetBound(); if (this.m_Solid) ...{ using (SolidBrush brush = new SolidBrush(this.m_BackColor)) ...{ g.FillRectangle(brush, bound); } } using (Pen pen = new Pen(this.m_ForeColor)) ...{ g.DrawRectangle(pen, bound); } } public override bool Near(int x, int y) ...{ Rectangle bound = this.GetBound(); Rectangle inner = bound; Rectangle outer = bound; inner.Inflate(-m_HalfGrab, -m_HalfGrab); outer.Inflate(m_HalfGrab, m_HalfGrab); Region reg = new Region(outer); reg.Exclude(inner); return reg.IsVisible(x, y); } public override void SetBound(Rectangle bound) ...{ this.m_Start = new Point(bound.X, bound.Y); this.m_End = new Point(bound.Right, bound.Bottom); }}当然也可以绘制Window控件:class ButtonObj:DrawBase...{ private Point m_Start; private Point m_End; private string m_Text; public ButtonObj(Point start, Point end) ...{ this.m_Start = start; this.m_End = end; } public string Text ...{ get ...{ return m_Text; } set ...{ m_Text = value; } } public override System.Drawing.Rectangle GetBound() ...{ int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X; int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y; int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X; int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y; return Rectangle.FromLTRB(x, y, r, b); } public override void Draw(Graphics g) ...{ Rectangle bound = this.GetBound(); using (Pen pen = new Pen(this.m_ForeColor)) ...{ ControlPaint.DrawButton(g, bound, ButtonState.Normal); using (SolidBrush brush = new SolidBrush(this.m_ForeColor)) ...{ using (Font font = new Font("宋体", 10)) ...{ using (StringFormat format = new StringFormat()) ...{ format.Alignment = StringAlignment.Center; format.LineAlignment = StringAlignment.Center; g.DrawString(this.m_Text, font, brush, bound, format); } } } } } public override bool Near(int x, int y) ...{ Rectangle bound = this.GetBound(); Rectangle outer = bound; outer.Inflate(m_HalfGrab, m_HalfGrab); return outer.Contains(x, y); } public override void SetBound(Rectangle bound) ...{ this.m_Start = new Point(bound.X, bound.Y); this.m_End = new Point(bound.Right, bound.Bottom); }} 定义这些图像的集合对象:class DrawList:List<DrawBase>...{ private Control m_Owner; public DrawList(Control owner) ...{ this.m_Owner = owner; } internal DrawBase GetNear(int x, int y) ...{ foreach (DrawBase draw in this) ...{ if (draw.Near(x, y)) ...{ return draw; } } return null; } internal void Draw(Graphics graphics) ...{ foreach (DrawBase draw in this) ...{ draw.Draw(graphics); } }}构建一个Window窗体用来展示图像操作: using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using DrawLines.DrawObjs;namespace DrawLines...{ public partial class Form1 : Form ...{ private DrawList m_drawList; private DrawBase m_curDraw; private Rectangle m_curBound; private Rectangle m_lastBound; private Point m_StartPoint; public Form1() ...{ InitializeComponent(); this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true); this.InitObjs(); } /**//// <summary> /// 构造对象 /// </summary> private void InitObjs() ...{ this.m_drawList = new DrawList(this); DrawBase.HalfGrab = 5; LineObj line0 = new LineObj(new Point(10, 10), new Point(100, 100)); line0.ForeColor = Color.Red; LineObj line1 = new LineObj(new Point(16, 67), new Point(100, 180)); line1.ForeColor = Color.Blue; RectangleObj rect = new RectangleObj(new Point(120, 70), new Point(220, 200)); rect.ForeColor = Color.Green; ButtonObj button = new ButtonObj(new Point(20, 20), new Point(90, 45)); button.ForeColor = Color.Black; button.Text = "button1"; m_drawList.Add(line0); m_drawList.Add(line1); m_drawList.Add(rect); m_drawList.Add(button); } /**//// <summary> /// 绘制对象 /// </summary> /// <param name="e"></param> protected override void OnPaint(PaintEventArgs e) ...{ this.m_drawList.Draw(e.Graphics); base.OnPaint(e); } /**//// <summary> /// 重写以移动对象或设置鼠标 /// </summary> /// <param name="e"></param> protected override void OnMouseMove(MouseEventArgs e) ...{ base.OnMouseMove(e); if (this.Capture) ...{ if (this.m_curDraw != null) ...{ this.moveObj(e); } return; } if (this.m_drawList.GetNear(e.X, e.Y) != null) ...{ this.Cursor = Cursors.SizeAll; } else ...{ this.Cursor = Cursors.Default; } } /**//// <summary> /// 重写以获取鼠标下的对象 /// </summary> /// <param name="e"></param> protected override void OnMouseDown(MouseEventArgs e) ...{ base.OnMouseDown(e); this.getObj(e); } /**//// <summary> /// 重写以按Delete键删除当前对象 /// </summary> /// <param name="keyData"></param> /// <returns></returns> protected override bool ProcessDialogKey(Keys keyData) ...{ if (keyData == Keys.Delete) ...{ if (this.m_curDraw != null) ...{ this.deleteObj(); } } return base.ProcessDialogKey(keyData); } private void btnDelete_Click(object sender, EventArgs e) ...{ if (this.m_curDraw != null) ...{ this.deleteObj(); } else ...{ MessageBox.Show(this, "没有选中的对象,请使用鼠标点选择一个!", "提示"); } } private void moveObj(MouseEventArgs e) ...{ Rectangle bound = this.m_curBound; bound.Offset(e.X - this.m_StartPoint.X, e.Y - this.m_StartPoint.Y); this.m_curDraw.SetBound(bound); Rectangle _last = this.m_lastBound; Rectangle _bound = bound; _last.Inflate(2, 2); _bound.Inflate(2, 2); using (Region invReg = new Region(_last)) ...{ invReg.Union(_bound); this.Invalidate(invReg); } this.m_lastBound = bound; } private void getObj(MouseEventArgs e) ...{ this.m_curDraw = this.m_drawList.GetNear(e.X, e.Y); if (this.m_curDraw != null) ...{ this.m_curBound = this.m_curDraw.GetBound(); this.m_StartPoint = e.Location; } } private void deleteObj() ...{ Rectangle bound = this.m_curDraw.GetBound(); this.m_drawList.Remove(this.m_curDraw); this.m_curDraw = null; bound.Inflate(2, 2); this.Invalidate(bound); } }} GDI编程 GDI+简单绘图 VS#2005 问题 如何实现高效的随机乱序 采用ASEClient的中文乱码问题 怎样将域名指向IP地址?急死了!高手帮忙啊.解决马上给分! WEB图片打印问题~ 哈希算法GetHashCode()起什么效果? 请教C#.net中类似beep()的方法 星星们,俺今年三十了,做程序开发今天很迷茫呀,生活与技术,到底如何是好? 在运行中,修改大量窗体控件的位置大小,出现运行缓慢的问题~ 新手提问:如何删除DataGrid中的一行记录? 要从网上下载图片 存到imagelist的问题 急~~~~~~~~~~~~~~~~ C# winform 一个问题!帮忙看下,谢谢了!
gdi+
熟悉下什么是画笔、画刷、调色板、画布等等概念。
...{
internal Color m_BackColor;
internal Color m_ForeColor;
internal static int m_HalfGrab; public static int HalfGrab
...{
get ...{ return DrawBase.m_HalfGrab; }
set ...{ DrawBase.m_HalfGrab = value; }
} public Color BackColor
...{
get ...{ return m_BackColor; }
set ...{ m_BackColor = value; }
} public Color ForeColor
...{
get ...{ return m_ForeColor; }
set ...{ m_ForeColor = value; }
} public abstract Rectangle GetBound();
public abstract void Draw(Graphics g);
public abstract bool Near(int x, int y);
public abstract void SetBound(Rectangle bound);
}
定义线:class LineObj:DrawBase
...{
private Point m_Start;
private Point m_End;
public LineObj(Point start, Point end)
...{
this.m_Start = start;
this.m_End = end;
}
public override System.Drawing.Rectangle GetBound()
...{
int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X;
int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y;
int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X;
int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y;
return Rectangle.FromLTRB(x, y, r, b);
} public override void Draw(System.Drawing.Graphics g)
...{
using (Pen pen = new Pen(this.m_ForeColor))
...{
g.DrawLine(pen, this.m_Start, this.m_End);
}
} public override bool Near(int x, int y)
...{
//点到直线的距离是否在抓取范围之内
float A = this.m_End.Y- this.m_Start.Y;
float B = this.m_End.X- this.m_Start.X;
float C = B * this.m_Start.Y - A * this.m_Start.X;
double D = (A * x - B * y + C) / (Math.Sqrt(A * A + B * B));
if (D >= -m_HalfGrab && D <= m_HalfGrab)
...{
RectangleF bounds = this.GetBound();
bounds.Inflate(m_HalfGrab, m_HalfGrab);
return bounds.Contains(x, y);
}
return false;
} public override void SetBound(Rectangle bound)
...{
this.m_Start = new Point(bound.X, bound.Y);
this.m_End = new Point(bound.Right, bound.Bottom);
}
}
定义矩形:class RectangleObj:DrawBase
...{
private Point m_Start;
private Point m_End;
private bool m_Solid;
public RectangleObj(Point start, Point end)
...{
this.m_Start = start;
this.m_End = end;
}
public bool Solid
...{
get ...{ return m_Solid; }
set ...{ m_Solid = value; }
}
public override System.Drawing.Rectangle GetBound()
...{
int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X;
int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y;
int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X;
int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y;
return Rectangle.FromLTRB(x, y, r, b);
} public override void Draw(Graphics g)
...{
Rectangle bound = this.GetBound();
if (this.m_Solid)
...{
using (SolidBrush brush = new SolidBrush(this.m_BackColor))
...{
g.FillRectangle(brush, bound);
}
}
using (Pen pen = new Pen(this.m_ForeColor))
...{
g.DrawRectangle(pen, bound);
}
} public override bool Near(int x, int y)
...{
Rectangle bound = this.GetBound();
Rectangle inner = bound;
Rectangle outer = bound;
inner.Inflate(-m_HalfGrab, -m_HalfGrab);
outer.Inflate(m_HalfGrab, m_HalfGrab);
Region reg = new Region(outer);
reg.Exclude(inner);
return reg.IsVisible(x, y);
} public override void SetBound(Rectangle bound)
...{
this.m_Start = new Point(bound.X, bound.Y);
this.m_End = new Point(bound.Right, bound.Bottom);
}
}当然也可以绘制Window控件:class ButtonObj:DrawBase
...{
private Point m_Start;
private Point m_End;
private string m_Text;
public ButtonObj(Point start, Point end)
...{
this.m_Start = start;
this.m_End = end;
}
public string Text
...{
get ...{ return m_Text; }
set ...{ m_Text = value; }
}
public override System.Drawing.Rectangle GetBound()
...{
int x = this.m_Start.X < this.m_End.X ? this.m_Start.X : this.m_End.X;
int y = this.m_Start.Y < this.m_End.Y ? this.m_Start.Y : this.m_End.Y;
int r = this.m_Start.X < this.m_End.X ? this.m_End.X : this.m_Start.X;
int b = this.m_Start.Y < this.m_End.Y ? this.m_End.Y : this.m_Start.Y;
return Rectangle.FromLTRB(x, y, r, b);
} public override void Draw(Graphics g)
...{
Rectangle bound = this.GetBound();
using (Pen pen = new Pen(this.m_ForeColor))
...{
ControlPaint.DrawButton(g, bound, ButtonState.Normal);
using (SolidBrush brush = new SolidBrush(this.m_ForeColor))
...{
using (Font font = new Font("宋体", 10))
...{
using (StringFormat format = new StringFormat())
...{
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
g.DrawString(this.m_Text, font, brush, bound, format);
}
}
}
}
} public override bool Near(int x, int y)
...{
Rectangle bound = this.GetBound();
Rectangle outer = bound;
outer.Inflate(m_HalfGrab, m_HalfGrab);
return outer.Contains(x, y);
} public override void SetBound(Rectangle bound)
...{
this.m_Start = new Point(bound.X, bound.Y);
this.m_End = new Point(bound.Right, bound.Bottom);
}
}
...{
private Control m_Owner;
public DrawList(Control owner)
...{
this.m_Owner = owner;
}
internal DrawBase GetNear(int x, int y)
...{
foreach (DrawBase draw in this)
...{
if (draw.Near(x, y))
...{
return draw;
}
}
return null;
} internal void Draw(Graphics graphics)
...{
foreach (DrawBase draw in this)
...{
draw.Draw(graphics);
}
}
}
构建一个Window窗体用来展示图像操作: using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DrawLines.DrawObjs;namespace DrawLines
...{
public partial class Form1 : Form
...{
private DrawList m_drawList;
private DrawBase m_curDraw;
private Rectangle m_curBound;
private Rectangle m_lastBound;
private Point m_StartPoint;
public Form1()
...{
InitializeComponent();
this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true); this.InitObjs();
}
/**//// <summary>
/// 构造对象
/// </summary>
private void InitObjs()
...{
this.m_drawList = new DrawList(this); DrawBase.HalfGrab = 5;
LineObj line0 = new LineObj(new Point(10, 10), new Point(100, 100));
line0.ForeColor = Color.Red; LineObj line1 = new LineObj(new Point(16, 67), new Point(100, 180));
line1.ForeColor = Color.Blue; RectangleObj rect = new RectangleObj(new Point(120, 70), new Point(220, 200));
rect.ForeColor = Color.Green; ButtonObj button = new ButtonObj(new Point(20, 20), new Point(90, 45));
button.ForeColor = Color.Black;
button.Text = "button1";
m_drawList.Add(line0);
m_drawList.Add(line1);
m_drawList.Add(rect);
m_drawList.Add(button);
}
/**//// <summary>
/// 绘制对象
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(PaintEventArgs e)
...{
this.m_drawList.Draw(e.Graphics);
base.OnPaint(e);
}
/**//// <summary>
/// 重写以移动对象或设置鼠标
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
...{
base.OnMouseMove(e);
if (this.Capture)
...{
if (this.m_curDraw != null)
...{
this.moveObj(e);
}
return;
}
if (this.m_drawList.GetNear(e.X, e.Y) != null)
...{
this.Cursor = Cursors.SizeAll;
}
else
...{
this.Cursor = Cursors.Default;
}
}
/**//// <summary>
/// 重写以获取鼠标下的对象
/// </summary>
/// <param name="e"></param>
protected override void OnMouseDown(MouseEventArgs e)
...{
base.OnMouseDown(e);
this.getObj(e);
}
/**//// <summary>
/// 重写以按Delete键删除当前对象
/// </summary>
/// <param name="keyData"></param>
/// <returns></returns>
protected override bool ProcessDialogKey(Keys keyData)
...{
if (keyData == Keys.Delete)
...{
if (this.m_curDraw != null)
...{
this.deleteObj();
}
}
return base.ProcessDialogKey(keyData);
}
private void btnDelete_Click(object sender, EventArgs e)
...{
if (this.m_curDraw != null)
...{
this.deleteObj();
}
else
...{
MessageBox.Show(this, "没有选中的对象,请使用鼠标点选择一个!", "提示");
}
}
private void moveObj(MouseEventArgs e)
...{
Rectangle bound = this.m_curBound; bound.Offset(e.X - this.m_StartPoint.X, e.Y - this.m_StartPoint.Y);
this.m_curDraw.SetBound(bound); Rectangle _last = this.m_lastBound;
Rectangle _bound = bound;
_last.Inflate(2, 2);
_bound.Inflate(2, 2); using (Region invReg = new Region(_last))
...{
invReg.Union(_bound);
this.Invalidate(invReg);
}
this.m_lastBound = bound;
}
private void getObj(MouseEventArgs e)
...{
this.m_curDraw = this.m_drawList.GetNear(e.X, e.Y);
if (this.m_curDraw != null)
...{
this.m_curBound = this.m_curDraw.GetBound();
this.m_StartPoint = e.Location;
}
}
private void deleteObj()
...{
Rectangle bound = this.m_curDraw.GetBound();
this.m_drawList.Remove(this.m_curDraw);
this.m_curDraw = null;
bound.Inflate(2, 2);
this.Invalidate(bound);
}
}
}
GDI+简单绘图