我正在创建一个绘画程序,我已经想出了如何在Form上绘制形状,但是如何保存它们,我试着这样做:
Image bmp = new Bitmap(this.Width - panel1.Width, this.Height - panel1.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
}
bmp.Save("test.bmp");
它保存test.bmp但该文件为空?
Heres是我的全部代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Paint_Program
{
public partial class PaintImg : Form
{
public Boolean veryimportantbool = false;
int drawcount = 0;
int brushsize = 16;
public PaintImg()
{
InitializeComponent();
//Cursor drawCursor = new Cursor("Pencil.cur");
//this.Cursor = drawCursor;
}
private void Form1_Load(object sender, EventArgs e)
{
//Cursor.Position = new Point(this.Location.X - this.Width / 2, this.Location.Y - this.Height / 2)
UserControl1 userc1 = new UserControl1();
userc1.Show();
brushsize = Convert.ToInt16(label1.Text);
}
private void rectangleShape1_Click(object sender, EventArgs e)
{
}
private void Test_Click(object sender, EventArgs e)
{
//testing
//Console.WriteLine("X:" + mousex);
//onsole.WriteLine("Y: " + mousey);
}
private void Form1_SizeChanged(object sender, EventArgs e)
{
}
public void Form1_MouseClick(object sender, MouseEventArgs i)
{
drawcount = drawcount + 1;
System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Red);
System.Drawing.Graphics formGraphics;
formGraphics = this.CreateGraphics();
formGraphics.FillRectangle(myBrush, new Rectangle(i.X, i.Y, brushsize, brushsize));
myBrush.Dispose();
formGraphics.Dispose();
count.Text = Convert.ToString(drawcount);
}
private void newToolStripButton_Click(object sender, EventArgs e)
{
//SetupDoc newsetup = new SetupDoc();
//newsetup.ShowDialog();
}
private void PaintImg_MouseMove(object sender, MouseEventArgs e)
{
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
}
private void panel1_Click(object sender, MouseEventArgs e)
{
drawcount = drawcount + 1;
System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Red);
System.Drawing.Graphics formGraphics;
formGraphics = this.CreateGraphics();
formGraphics.FillRectangle(myBrush, new Rectangle(e.X, e.Y, brushsize, brushsize));
myBrush.Dispose();
formGraphics.Dispose();
count.Text = Convert.ToString(drawcount);
}
private void label1_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
brushsize = brushsize + 1;
label1.Text = Convert.ToString(brushsize);
}
private void button2_Click(object sender, EventArgs e)
{
brushsize = brushsize - 1;
label1.Text = Convert.ToString(brushsize);
}
private void button3_Click(object sender, EventArgs e)
{
Image bmp = new Bitmap(this.Width - panel1.Width, this.Height - panel1.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
}
bmp.Save("test.bmp");
}
}
}
如果有人新的怎么办,我会贬低它???? :d
答案 0 :(得分:1)
Bitmap bmp;
Graphics objGraphics;
Rectangle rt;
Point pnt;
rt = this.ClientRectangle;
pnt = this.PointToScreen(new Point(0, 0));
bmp = new Bitmap(rt.Width, rt.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
objGraphics = Graphics.FromImage(bmp);
objGraphics.CopyFromScreen(pnt.X, pnt.Y, 0, 0, rt.Size, CopyPixelOperation.SourceCopy);
objGraphics.Dispose();
bmp.Save("test.bmp");
bmp.Dispose();
瓦尔特
答案 1 :(得分:0)
您发布的代码没有任何问题 - 它完全符合您编码的内容 - 没有任何内容。它会创建一个很好的空文件,其大小已经指定(根据您已经通过的参数,这可能是错误的。)
要在需要绘制的位图上显示某些内容 - 即从panel1_Click
重构代码以绘制,或者至少硬编码:
Image bmp = new Bitmap(20, 20);
using (Graphics g = Graphics.FromImage(bmp))
{
g.FillRectangle(new SolidBrush(Color.Red), new Rectangle(3, 3, 8, 8));
}
bmp.Save("test.bmp");