绘图时替换旧值
我正在使用Windows窗体应用程序并使用一个按钮生成随机数并在表单上绘制。单击按钮时，它使用Graphics.Drawing方法添加随机数。问题是当我第一次按下按钮它工作正常并添加一个随机数，即11111.当我再次按下按钮时，它将添加一个新的随机数（在下一个位置），但它也会将以前的数字更改为新生成的随机数。
更新:(已添加完整代码）
编辑： 我已将Random移到了scoop之外，所以现在它不会生成相同的数字，但仍会将旧的随机数更改为其他数字。
主类：
using System;
using System.Collections;
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 DrawingText
{
public partial class Form1 : Form
{
private Point mouseDownPosition = new Point(0, 0);
private Point mouseMovePosition = new Point(0, 0);
private int mousePressdDown;
private ArrayList drawnItemsList;
Random rnd;
public Form1()
{
InitializeComponent();
drawnItemsList = new ArrayList();
this.rnd = new Random();
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
mouseMovePosition = e.Location;
if (e.Button == MouseButtons.Left)
mousePressdDown = 1;
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
mouseDownPosition = e.Location;
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
if (mousePressdDown == 1)
{
label1.Text = "X: " + mouseMovePosition.X.ToString();
label2.Text = "Y: " + mouseMovePosition.Y.ToString();
this.Invalidate();
}
DrawingData a = new DrawingData(mouseMovePosition, mouseDownPosition);
drawnItemsList.Add(a);
mousePressdDown = 0;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
foreach (DrawingData a in drawnItemsList)
{
draw(e.Graphics, a.old, a.cur);
}
draw(e.Graphics, mouseDownPosition, mouseMovePosition);
}
private void draw(Graphics e, Point mold, Point mcur)
{
Pen p = new Pen(Color.Black, 2);
using (Font useFont = new Font("Gotham Medium", 28, FontStyle.Bold))
{
string header2 = rnd.Next().ToString();
RectangleF header2Rect = new RectangleF();
int moldX = mold.X - 5;
int moldY = mold.Y;
header2Rect.Location = new Point(moldX, moldY);
header2Rect.Size = new Size(600, ((int)e.MeasureString(header2, useFont, 600, StringFormat.GenericTypographic).Height));
e.DrawString(header2, useFont, Brushes.Black, header2Rect);
}
}
private void button1_Click(object sender, EventArgs e)
{
}
}
}
绘图数据类：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
namespace DrawingText
{
[Serializable]
class DrawingData
{
private Point mold; // mouseDown position
private Point mcur; // mouseUp poslition
public DrawingData()
{
mold = new Point(0, 0);
mcur = new Point(0, 0);
}
public DrawingData(Point old, Point cur)
{
mold = old;
mcur = cur;
}
public Point old
{
get
{
return mold;
}
set
{
mold = value;
}
}
public Point cur
{
get
{
return mcur;
}
set
{
mcur = value;
}
}
}
}
单击3次按钮，用新的值替换旧值：
3 个答案:
答案 0 :(得分：1)
您需要将随机值与点值一起存储在DrawingData类中，如下所示：
主类：
namespace DrawingText
{
public partial class Form1 : Form
{
private Point mouseDownPosition = new Point(0, 0);
private Point mouseMovePosition = new Point(0, 0);
private int mousePressdDown;
private ArrayList drawnItemsList;
Random rnd;
public Form1()
{
InitializeComponent();
drawnItemsList = new ArrayList();
this.rnd = new Random();
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
if (mousePressdDown == 1)
{
label1.Text = "X: " + mouseMovePosition.X.ToString();
label2.Text = "Y: " + mouseMovePosition.Y.ToString();
this.Invalidate();
}
DrawingData a = new DrawingData(mouseMovePosition, mouseDownPosition, rnd.Next().ToString());
drawnItemsList.Add(a);
mousePressdDown = 0;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
foreach (DrawingData a in drawnItemsList)
{
draw(e.Graphics, a);
}
draw(e.Graphics, mouseDownPosition, mouseMovePosition);
}
private void draw(Graphics e, DrawingData a)
{
Pen p = new Pen(Color.Black, 2);
using (Font useFont = new Font("Gotham Medium", 28, FontStyle.Bold))
{
RectangleF header2Rect = new RectangleF();
int moldX = a.old.X - 5;
int moldY = a.old.Y;
header2Rect.Location = new Point(moldX, moldY);
header2Rect.Size = new Size(600, ((int)e.MeasureString(header2, useFont, 600, StringFormat.GenericTypographic).Height));
e.DrawString(a.Rand, useFont, Brushes.Black, header2Rect);
}
}
}
}
绘图数据类：
namespace DrawingText
{
[Serializable]
public class DrawingData
{
private Point mold; // mouseDown position
private Point mcur; // mouseUp poslition
private string randValue; // random data value
public DrawingData()
{
mold = new Point(0, 0);
mcur = new Point(0, 0);
randValue = String.Empty;
}
public DrawingData(Point old, Point cur, string rand)
{
mold = old;
mcur = cur;
randValue = rand;
}
public Point old
{
get
{
return mold;
}
set
{
mold = value;
}
}
public Point cur
{
get
{
return mcur;
}
set
{
mcur = value;
}
}
public sting Rand
{
get
{
return randValue;
}
set
{
randValue = value;
}
}
}
答案 1 :(得分：0)
您每次在循环中重新创建随机，这将导致它具有相同的种子和相同的第一个数字。这就是为什么你的所有数字都是一样的。你应该。
-
将随机移动到方法之外并循环，然后使用它。将行Random Rnd = new Random（）更改为rnd = new Random（）。你已经在类中有一个变量来保存随机数。
-
如果您希望之前的随机数保持与上次相同，则需要将它们存储在某个列表中并在绘画上绘制它们。您目前正在每次创建一组新的随机数。
答案 2 :(得分：0)
这是使用图形路径动态制作的：
GraphicsPath gp;
int moldX = 10;
int moldY = 10;
public Form1()
{
InitializeComponent();
gp = new GraphicsPath();
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.FillPath(Brushes.Black, gp);
// if you want the numbers outlined do e.Graphics.DrawPath
}
private void button1_Click(object sender, EventArgs e)
{
AddToPath();
Invalidate();
}
private void AddToPath()
{
using (Font useFont = new Font("Gotham Medium", 28, FontStyle.Bold))
{
Random rnd = new Random();
string header2 = rnd.Next().ToString();
int strsize = TextRenderer.MeasureText(header2, useFont).Height;
StringFormat format = StringFormat.GenericDefault;
gp.AddString(header2, useFont.FontFamily, 1, 28, new Point(moldX, moldY), format);
moldX += 5;
moldY += strsize;
}
}
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