使用C#實現(xiàn)一個簡單的繪圖工具
更新時間：2024年02月01日 10:57:09 作者：lingxiao16888
這篇文章主要為大家詳細(xì)介紹了如何使用C#開發(fā)的簡單繪圖工具,可以將簽名簡單繪圖后的效果以圖片的形式導(dǎo)出,有需要的小伙伴可以跟隨小編一起學(xué)習(xí)一下
1.目的
使用C#開發(fā)的簡單繪圖工具，將簽名，簡單繪圖后的效果以圖片的形式導(dǎo)出。
2.相關(guān)技術(shù)
GDI.....實在沒啥
3.效果展示
無背景狀態(tài)：
導(dǎo)出的圖片效果：
添加背景后：
導(dǎo)出的圖片效果：
4.代碼
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
g = this.CreateGraphics();
}
Graphics g;
Graphics imgGraphice;
Color curColor = Color.Black;
string title;
Image backImg;
DrawingMode curDrawingTool = DrawingMode.None;
int penSize = 0;
bool drawingFlag = false;
TextBox tb;
private void Form1_Load(object sender, EventArgs e)
{
title = this.Text;
toolStripComboBox1.SelectedIndex = 0;
}
private void opentoolStrip_Click(object sender, EventArgs e)
{
using (OpenFileDialog ofd = new OpenFileDialog())
{
ofd.Filter = "jpg圖片|*.jpg";
ofd.Multiselect = false;
if (ofd.ShowDialog() == DialogResult.OK)
{
Image sourceImage = Image.FromFile(ofd.FileName);
backImg = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height);
imgGraphice = Graphics.FromImage(backImg);
RectangleF rec = new RectangleF(0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height);
imgGraphice.DrawImage(sourceImage,rec , new RectangleF(0, 0, sourceImage.Width, sourceImage.Height), GraphicsUnit.Pixel);
g.Clear(Color.White);
g.DrawImage(sourceImage,this.ClientRectangle);
this.Text = title + "\t" + ofd.FileName;
}
}
}
private void newtoolStrip_Click(object sender, EventArgs e)
{
//自定義圖片
backImg = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height);
imgGraphice = Graphics.FromImage(backImg);
imgGraphice.Clear(Color.White);
g.DrawImage(backImg, this.ClientRectangle);
this.Text = title + "\t未命名";
}
private void savetoolStrip_Click(object sender, EventArgs e)
{
if (backImg == null) return;
using (SaveFileDialog sfd = new SaveFileDialog())
{
sfd.Filter = "圖像文件|*.jpg";
if (sfd.ShowDialog() == DialogResult.OK)
{
backImg.Save(sfd.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);
MessageBox.Show("保存至:" + sfd.FileName, "", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
private void exittoolStrip_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void colortoolStrip_Click(object sender, EventArgs e)
{
using (ColorDialog cd = new ColorDialog())
{
if (cd.ShowDialog() == DialogResult.OK)
{
curColor = cd.Color;
}
}
}
private void btnPen_Click(object sender, EventArgs e)
{
curDrawingTool = DrawingMode.Pen;
}
private void btnLine_Click(object sender, EventArgs e)
{
curDrawingTool = DrawingMode.Line;
}
private void btnRec_Click(object sender, EventArgs e)
{
curDrawingTool = DrawingMode.Rectangle;
}
private void btnEllipse_Click(object sender, EventArgs e)
{
curDrawingTool = DrawingMode.Ellipse;
}
private void btnText_Click(object sender, EventArgs e)
{
curDrawingTool = DrawingMode.Text;
}
private void btnRubber_Click(object sender, EventArgs e)
{
curDrawingTool = DrawingMode.Rubber;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
//進(jìn)行重繪不然窗口最小化后就沒有
if (backImg != null)
g.DrawImage(backImg, this.ClientRectangle);
}
Point oldPoint;
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
oldPoint = e.Location;
drawingFlag = true;
}
switch (curDrawingTool)
{
case DrawingMode.None:
break;
case DrawingMode.Pen:
break;
case DrawingMode.Line:
break;
case DrawingMode.Rectangle:
break;
case DrawingMode.Ellipse:
break;
case DrawingMode.Text:
if (imgGraphice == null)
return;
//在當(dāng)前位置添加
tb = new TextBox();
tb.Width = 100;
tb.Height = 30;
tb.BackColor = Color.FromArgb(192, 255, 192);
tb.BorderStyle = BorderStyle.Fixed3D;
tb.Location = e.Location;
tb.KeyDown += Tb_KeyDown;
this.Controls.Add(tb);
break;
case DrawingMode.Rubber:
break;
default:
break;
}
}
private void Tb_KeyDown(object sender, KeyEventArgs e)
{
if (imgGraphice == null)
return;
if (e.KeyValue == 13)
{
g.DrawString(tb.Text, new Font("宋體", 12), new SolidBrush(curColor), oldPoint);
imgGraphice.DrawString(tb.Text, new Font("宋體", 12), new SolidBrush(curColor), oldPoint);
this.Controls.Remove(tb);
}
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
labCoord.Text = e.Location.ToString();
if (imgGraphice == null || drawingFlag == false) return;
switch (curDrawingTool)
{
case DrawingMode.None:
break;
case DrawingMode.Pen:
g.DrawLine(new Pen(curColor, penSize), oldPoint, e.Location);
imgGraphice.DrawLine(new Pen(curColor, penSize), oldPoint, e.Location);
oldPoint = e.Location;
break;
case DrawingMode.Line:
//為表現(xiàn)出實時效果需要擦寫痕跡效果(即在form上進(jìn)行繪制只是表象，一切以在image上繪制為準(zhǔn))
Form1_Paint(null, null);
g.DrawLine(new Pen(curColor, penSize), oldPoint, e.Location);
break;
case DrawingMode.Rectangle:
Form1_Paint(null, null);
g.DrawRectangle(new Pen(curColor, penSize),oldPoint.X,oldPoint.Y,e.X-oldPoint.X,e.Y-oldPoint.Y);
break;
case DrawingMode.Ellipse:
Form1_Paint(null, null);
g.DrawEllipse(new Pen(curColor, penSize), oldPoint.X, oldPoint.Y, e.X - oldPoint.X, e.Y - oldPoint.Y);
break;
case DrawingMode.Text:
break;
case DrawingMode.Rubber:
//所謂橡皮擦就是繪制白線
g.DrawLine(new Pen(Color.White, penSize), oldPoint, e.Location);
imgGraphice.DrawLine(new Pen(Color.White, penSize), oldPoint, e.Location);
oldPoint = e.Location;
break;
default:
break;
}
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
drawingFlag = false;
if (imgGraphice == null) return;
switch (curDrawingTool)
{
case DrawingMode.None:
break;
case DrawingMode.Pen:
break;
case DrawingMode.Line:
//這里繪制Line的最終效果
imgGraphice.DrawLine(new Pen(curColor, penSize), oldPoint, e.Location);
break;
case DrawingMode.Rectangle:
imgGraphice.DrawRectangle(new Pen(curColor, penSize), oldPoint.X, oldPoint.Y, e.X - oldPoint.X, e.Y - oldPoint.Y);
break;
case DrawingMode.Ellipse:
imgGraphice.DrawEllipse(new Pen(curColor, penSize), oldPoint.X, oldPoint.Y, e.X - oldPoint.X, e.Y - oldPoint.Y);
break;
case DrawingMode.Text:
break;
case DrawingMode.Rubber:
break;
default:
break;
}
}
private void toolStripComboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
int size;
if (int.TryParse(toolStripComboBox1.Text, out size))
{
penSize = size;
}
}
}
enum DrawingMode
{
None,
Pen,
Line,
Rectangle,
Ellipse,
Text,
Rubber
}到此這篇關(guān)于使用C#實現(xiàn)一個簡單的繪圖工具的文章就介紹到這了,更多相關(guān)C#繪圖內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
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