在C#中保存用户绘制的位图图形 [英] Save User Drawn Bitmap Graphics in c#
问题描述
我制作了一个程序，允许用户在画框图像上绘制线条，但是现在需要保存这些线条，以便以后打开.这是我当前绘制线条的代码:
I have made a program that allows users to draw lines onto a picturebox image but now need to save these lines to be opened at a later date. This is my current code for drawing the lines:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
}
int Drawshape;
private Point p1, p2;
List<Point> p1List = new List<Point>();
List<Point> p2List = new List<Point>();
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
Drawshape = 5;
}
private void button2_Click(object sender, EventArgs e)
{
Drawshape = 2;
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (Drawshape == 5)
{
if (p1.X == 0)
{
p1.X = e.X;
p1.Y = e.Y;
}
else
{
p2.X = e.X;
p2.Y = e.Y;
p1List.Add(p1);
p2List.Add(p2);
pictureBox1.Invalidate();
p1.X = 0;
}
}
}
private void pictureBox1_ParentChanged(object sender, EventArgs e)
{
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
Graphics G = Graphics.FromImage(pictureBox1.Image);
if (Drawshape == 5)
{
using (var p = new Pen(Color.Blue, 4))
{
for (int x = 0; x < p1List.Count; x++)
{
G.DrawLine(p, p1List[x], p2List[x]);
}
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
pictureBox1.Invalidate();
}
private void Save_Click(object sender, EventArgs e)
{
}
}
}
我不知道如何保存这些行，并在以后用户需要时再次打开它们.我已经打开并保存了文件对话框，但是不确定如何使它们完成我希望他们做的工作.请帮忙.
I don't know how to save these lines and also open them again at a later time when the user wants to. I have put in open and save filedialogs but not sure how to make them do the job i want them to do. Please Help.
谢谢
推荐答案
如果您要保存图片框中显示的图像，请在运行时完成在其上方绘制的所有行，您可以使用 Control.DrawToBitmap方法.
If you want to save the image that is displayed in the picture box, complete with any lines that may have been drawn on top of it during run-time, you can use the Control.DrawToBitmap method.
I can't tell for sure if you're also asking how to use a SaveFileDialog to determine where the user wants to save the file or if you've already got that part figured out, but it's very simple.
这是一个完整解决方案的示例.首先，通过保存对话框提示用户(标题为保存图像"，默认情况下过滤为位图图像(* .bmp)).如果他们单击确定"，则在图片框中显示的图像将绘制到一个临时位图，并且该临时位图将保存到他们指定的位置.如果他们单击取消"，则不会保存文件，并且该方法只会退出.
Here's an example of a complete solution. First, the user is prompted by a save dialog (entitled "Save Image" and filtering to bitmap images (*.bmp) by default). If they click OK, the image displayed in the picture box is drawn to a temporary bitmap, and that temporary bitmap is saved to the location they specified. If they click Cancel, the file is not saved and the method simply exits.
private void Save_Click(object sender, EventArgs e)
{
//Show a save dialog to allow the user to specify where to save the image file
using (SaveFileDialog dlgSave = new SaveFileDialog())
{
dlgSave.Title = "Save Image";
dlgSave.Filter = "Bitmap Images (*.bmp)|*.bmp|All Files (*.*)|*.*";
if (dlgSave.ShowDialog(this) == DialogResult.OK)
{
//If user clicked OK, then save the image into the specified file
using (Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height))
{
picturebox1.DrawToBitmap(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height));
bmp.Save(dlgSave.FileName);
}
}
}
}
这篇关于在C#中保存用户绘制的位图图形的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
