如何在油漆中编写橡皮擦... [英] how to code for an eraser in paint...

问题描述

你可以帮我解决一下橡皮擦和多种颜色的代码（比如ms-paint）吗？

当我们点击时如何将鼠标指针改为笔刷那些相应的按钮？



任何人请回复我，请至少给我一个想法。

解决方案

< blockquote>鼠标指针很简单： Cursor = new Cursor（...）; （有关详细信息，请参阅MSDN，根据存储光标形状的方式，有四种不同的构造函数） 。



多种颜色/橡皮擦的编码有点困难，取决于你如何存储和显示你的图像。

图片框中的FillEraser鼠标移动事件



private void FillEraser（对象发送者，MouseEventArgs e）

{

if（pctFundusMain.Image！= null）

{

if（e.Button == MouseButtons.Left）

{

PictureBox thisform =（PictureBox）sender;

Graphics g = thisform.CreateGraphics（）;

var pen = new Pen（Color.White，5）;

pen.Width = FixEraserThickness（）;

//新的SolidBrush（Color.White）;

_bitmap = new Bitmap（pctFundusMain.Image）;

g = Graphics.FromImage（_bitmap）;

var cursorLocation = new Point（eX + 5，eY + 5）;

// g.DrawLine （pen，eX，eY，eX + 5，eY + 5）;

g.DrawLine（pen，pe，cursorLocation）;

pctFundusMain.Image = _bitmap;

pe = cursorLocation;

}

}

}

Can u please help me out how to code for an eraser and for multiple colors(such as in ms-paint)?
How to change the mouse pointer to pen n brush when we click on those corresponding buttons?

Any one please reply me else please at-least give me an idea.

解决方案

Mouse pointer is easy: Cursor = new Cursor(...); (see MSDN for details, there are four different constructors based on how you store your cursor shape).

Coding for multiple colours / eraser is a bit harder, and depends on how you are storing and dispalying your images.

FillEraser in picture box mouse move event

private void FillEraser(object sender, MouseEventArgs e)
{
if (pctFundusMain.Image != null)
{
if (e.Button == MouseButtons.Left)
{
PictureBox thisform = (PictureBox)sender;
Graphics g = thisform.CreateGraphics();
var pen = new Pen(Color.White, 5);
pen.Width = FixEraserThickness();
// new SolidBrush(Color.White);
_bitmap = new Bitmap(pctFundusMain.Image);
g = Graphics.FromImage(_bitmap);
var cursorLocation = new Point(e.X + 5, e.Y + 5);
// g.DrawLine(pen, e.X, e.Y, e.X + 5, e.Y + 5);
g.DrawLine(pen, pe, cursorLocation);
pctFundusMain.Image = _bitmap;
pe = cursorLocation;
}
}
}

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