本文是利用C# 开发截图软件的小例子，以供学习分享使用。
思路：
涉及的知识点：
效果图如下【主要实现了截图，保存，复制，画矩形，笔触，荧光笔，橡皮擦等功能】：
保存后图片如下：
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核心代码如下：
截取屏幕图像：
public Bitmap GetScreen()
{
//获取整个屏幕图像,不包括任务栏
Rectangle ScreenArea = Screen.GetWorkingArea(this);
Bitmap bmp = new Bitmap(ScreenArea.Width, ScreenArea.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
g.CopyFromScreen(0, 0, 0, 0, new Size(ScreenArea.Width,ScreenArea.Height));
}
return bmp;
}
绘制图形功能：
#region 绘制功能
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
Graphics g = pe.Graphics;
DrawHistory(g);
//绘制当前线
if (startDraw && this.curLine.PointList != null && this.curLine.PointList.Count > 0)
{
DrawLine(g,this.curLine);
}
if (startDraw && this.curRect.Start != null && this.curRect.End != null && this.curRect.Start != this.curRect.End) {
DrawRectangle(g, this.curRect);
}
}
public void DrawHistory(Graphics g) {
//绘制线历史记录
if (LineHistory != null)
{
foreach (HLine lh in LineHistory)
{
if (lh.PointList.Count > 10)
{
DrawLine(g, lh);
}
}
}
//绘制矩形历史记录
if (RectHistory != null)
{
foreach (HRectangle lh in RectHistory)
{
if (lh.Start!=null&& lh.End!=null && lh.Start!=lh.End)
{
DrawRectangle(g, lh);
}
}
}
}
/// <summary>
/// 绘制线
/// </summary>
/// <param name="g"></param>
/// <param name="line"></param>
private void DrawLine(Graphics g,HLine line) {
g.SmoothingMode = SmoothingMode.AntiAlias;
using (Pen p = new Pen(line.LineColor, line.LineWidth))
{
//设置起止点线帽
p.StartCap = LineCap.Round;
p.EndCap = LineCap.Round;
//设置连续两段的联接样式
p.LineJoin = LineJoin.Round;
g.DrawCurve(p, line.PointList.ToArray()); //画平滑曲线
}
}
/// <summary>
/// 绘制矩形
/// </summary>
/// <param name="g"></param>
/// <param name="rect"></param>
private void DrawRectangle(Graphics g, HRectangle rect)
{
g.SmoothingMode = SmoothingMode.AntiAlias;
using (Pen p = new Pen(rect.LineColor, rect.LineWidth))
{
//设置起止点线帽
p.StartCap = LineCap.Round;
p.EndCap = LineCap.Round;
//设置连续两段的联接样式
p.LineJoin = LineJoin.Round;
g.DrawRectangle(p, rect.Start.X, rect.Start.Y, rect.End.X - rect.Start.X, rect.End.Y - rect.Start.Y); //画平滑曲线
}
}
public void Earser(Point p0)
{
for (int i = lineHistory.Count - 1; i >= 0; i--)
{
HLine line = lineHistory[i];
bool flag = false;
foreach (Point p1 in line.PointList)
{
double distance = GetDistance(p0, p1);
if (Math.Abs(distance) < 6)
{
//需要删除
flag = true;
break;
}
}
if (flag)
{
lineHistory.RemoveAt(i);
}
}
//擦除矩形
for (int i = rectHistory.Count - 1; i >= 0; i--)
{
HRectangle rect = rectHistory[i];
if (p0.X>rect.Start.X && p0.X<rect.End.X && p0.Y > rect.Start.Y && p0.Y < rect.End.Y) {
rectHistory.RemoveAt(i);
}
}
}
/// <summary>
/// 获取两点之间的距离
/// </summary>
/// <param name="p0"></param>
/// <param name="p1"></param>
/// <returns></returns>
private double GetDistance(Point p0, Point p1) {
return Math.Sqrt(Math.Pow((p0.X - p1.X), 2) + Math.Pow((p0.Y - p1.Y), 2));
}
#endregion
以下是源码功能连接，需要的朋友可以自行下载。
以上所述是小编给大家介绍的C# 实现截图软件功能实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
