实例介绍
【实例简介】
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;
namespace DrawDragRect
{
public struct PaintStruct
{
public Graphics dc;
public bool isPaint;
};
public partial class MainForm : CDrawDragRect
//Form
{
public int nDblClick;
Image imgResize;
Image img;
public void LoadImage()
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "Image Files(*.BMP;*.JPG;*.GIF;*.Tiff)|*.BMP;*.JPG;*.GIF;*.Tiff ";
if(DialogResult.OK == ofd.ShowDialog())
img = Image.FromFile(ofd.FileName);
Invalidate();
nDblClick = -1;
}
public MainForm()
{
InitializeComponent();
Icon = new Icon(GetType(), "Icon1.ico");
Text = "DrawDragRect API for .NET";
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
//WindowState = FormWindowState.Minimized;
WindowState = FormWindowState.Normal;
LoadImage();
}
public void DrawImage(PaintStruct ps)
{
if (img != null)
{
if (imgResize != null)
imgResize.Dispose();
if (ClientRectangle.Width > 0 && ClientRectangle.Height > 0)
{
imgResize = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);
Graphics dcTmp = Graphics.FromImage(imgResize);
dcTmp.DrawImage(img, ClientRectangle);
dcTmp.Dispose();
if (ps.isPaint)
{
Graphics dc = ps.dc;
dc.DrawImage(imgResize, ClientRectangle);
}
else
{
Graphics dc = CreateGraphics();
dc.DrawImage(imgResize, ClientRectangle);
ReflectedBLockText(dc, new Point(ClientRectangle.Width / 10, ClientRectangle.Height / 4));
dc.Dispose();
}
}
}
}
protected override void OnPaint(PaintEventArgs e)
{
PaintStruct ps;
ps.dc = e.Graphics;
ps.isPaint = true;
DrawImage(ps);
ReflectedBLockText(e.Graphics, new Point(ClientRectangle.Width/10, ClientRectangle.Height/4));
base.OnPaint(e);
}
protected override void OnMouseDoubleClick(MouseEventArgs e)
{
base.OnMouseDoubleClick(e);
LoadImage();
}
protected override void OnResize(EventArgs e)
{
PaintStruct ps;
ps.dc = null;
ps.isPaint = false;
DrawImage(ps);
base.OnResize(e);
}
protected override void OnMouseDown(MouseEventArgs e)
{
Invalidate();
nDblClick = 0;
base.OnMouseDown(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
if (rcNew.Width > 0 && rcNew.Height > 0);
else
{
base.OnMouseUp(e);
return;
}
if (nDblClick == -1)
{
base.OnMouseUp(e);
return;
}
ChildFrm chFrm = new ChildFrm();
//Graphics dc = CreateGraphics();
chFrm.img = new Bitmap(rcNew.Width, rcNew.Height);
//Image img = new Bitmap(rcNew.Width, rcNew.Height);
Graphics dcMem = Graphics.FromImage(chFrm.img);
//Graphics dcMem = Graphics.FromImage(img);
dcMem.Clear(Color.Azure);
dcMem.DrawImage(imgResize, new Rectangle(0, 0, rcNew.Width, rcNew.Height), rcNew, GraphicsUnit.Pixel);
dcMem.Dispose();
chFrm.Size = new Size(chFrm.img.Width 4,chFrm.img.Height 34);
chFrm.Show();
//dc.DrawImage(img, new Point(0, 0));
nDblClick = -1;
base.OnMouseUp(e);
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Escape)
{
base.Close();
}
return base.ProcessCmdKey(ref msg, keyData);
}
public void BlockText(Graphics dc, int a, int b)
{
//Font font = new Font("verdana", ClientRectangle.Width * 37 / 452, FontStyle.Bold);
Font font = new Font("verdana", 12, FontStyle.Bold);
int x = a;
int y = b;
string str = "With Left mouse button down\ndrag the mouse";
int j = 0;
dc.SmoothingMode = SmoothingMode.HighQuality;
dc.PixelOffsetMode = PixelOffsetMode.HighQuality;
for (j = 0; j < 7; j = 1)
{
dc.DrawString(str, font, Brushes.Black, new PointF(x j, y j));
}
SizeF sizef = dc.MeasureString(str, Font);
sizef.Width /= 8;
sizef.Height /= 8;
PointF ptf = new PointF(x j, y j);
RectangleF rectf = new RectangleF(ptf, sizef);
LinearGradientBrush lgBrush = new LinearGradientBrush(rectf, Color.Yellow, Color.Red, LinearGradientMode.ForwardDiagonal);
lgBrush.WrapMode = WrapMode.TileFlipXY;
dc.DrawString(str, font, lgBrush, ptf);
}
public void ReflectedBLockText(Graphics dc, Point pt)
{
Point p = pt;
p.Offset(0, ClientRectangle.Height * 100 / 351);
BlockText(dc, p.X, p.Y);
string str = "Resize or Double click";
//Font font = new Font("Tahoma", ClientRectangle.Width * 27 / 452, FontStyle.Bold);
Font font = new Font("Tahoma", 15, FontStyle.Bold);
SizeF sz = dc.MeasureString(str, font);
StringFormat strFmt = StringFormat.GenericDefault;
Rectangle rcTmp = new Rectangle(pt.X, pt.Y, (int)(sz.Width 1), (int)(sz.Height 1));
LinearGradientBrush brLinear = new LinearGradientBrush(new Point(0, rcTmp.Height / 4), new Point(0, rcTmp.Height / 8), Color.Red, Color.White);
brLinear.WrapMode = WrapMode.TileFlipX;
dc.TranslateTransform(pt.X, pt.Y);
GraphicsState dcState = dc.Save();
int j = 0;
for (j = 0; j < 5; j )
{
dc.DrawString(str, font, Brushes.Yellow, new PointF(-j, j));
}
dc.DrawString(str, font, brLinear, -j, j, strFmt);
dc.ScaleTransform(1, -1);
dc.DrawString(str, font, brLinear, -j, (float)-(1.59 * sz.Height), strFmt);
dc.Restore(dcState);
//dc.Dispose();
}
}
}
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