C# 提供两种切割圆形图片的方式
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private void Form1_Load(object sender, EventArgs e)
{
string file =System.IO.Path.Combine(Environment.CurrentDirectory, @"11.jpg");
try
{
Image i = new Bitmap(file);
pbO.Image = i;
pbD1.Image = WayOne(file);
pbD2.Image = WayTwo(file);
pbS1.Image = WaySOne(file);
pbS2.Image = WaySTwo(file);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private Bitmap WayOne(string file)
{
using (Image i = new Bitmap(file))
{
Bitmap b = new Bitmap(i.Width, i.Height);
using (Graphics g = Graphics.FromImage(b))
{
g.FillEllipse(new TextureBrush(i), 0, 0, i.Width, i.Height);
}
return b;
}
}
private Bitmap WayTwo(string file)
{
using (Image i = new Bitmap(file))
{
Bitmap b = new Bitmap(i.Width, i.Height);
using (Graphics g = Graphics.FromImage(b))
{
g.DrawImage(i, 0, 0, b.Width, b.Height);
int r = Math.Min(b.Width, b.Height) / 2;
PointF c = new PointF(b.Width / 2.0F, b.Height / 2.0F);
for (int h = 0; h < b.Height; h++)
for (int w = 0; w < b.Width; w++)
if ((int)Math.Pow(r, 2) < ((int)Math.Pow(w * 1.0 - c.X, 2) + (int)Math.Pow(h * 1.0 - c.Y, 2)))
{
b.SetPixel(w, h, Color.Transparent);
}
}
return b;
}
}
private Bitmap WaySOne(string file)
{
using (Image i = new Bitmap(file))
{
Bitmap b = new Bitmap(i.Width, i.Height);
using (Graphics g = Graphics.FromImage(b))
{
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
using (System.Drawing.Drawing2D.GraphicsPath p = new System.Drawing.Drawing2D.GraphicsPath(System.Drawing.Drawing2D.FillMode.Alternate))
{
p.AddEllipse(0, 0, i.Width, i.Height);
g.FillPath(new TextureBrush(i), p);
}
//g.FillEllipse(new TextureBrush(i), 0, 0, i.Width, i.Height);
}
return b;
}
}
private Bitmap WaySTwo(string file)
{
using (Image i = new Bitmap(file))
{
Bitmap b = new Bitmap(i.Width, i.Height);
using (Graphics g = Graphics.FromImage(b))
{
g.DrawImage(i, 0, 0, b.Width, b.Height);
int r = Math.Min(b.Width, b.Height) / 2;
PointF c = new PointF(b.Width / 2.0F, b.Height / 2.0F);
for (int h = 0; h < b.Height; h++)
for (int w = 0; w < b.Width; w++)
if ((int)Math.Pow(r, 2) < ((int)Math.Pow(w * 1.0 - c.X, 2) + (int)Math.Pow(h * 1.0 - c.Y, 2)))
{
b.SetPixel(w, h, Color.Transparent);
}
//画背景色圆
using (Pen p = new Pen(System.Drawing.SystemColors.Control))
g.DrawEllipse(p, 0, 0, b.Width, b.Height);
}
return b;
}
}