如何绘制图像的一行？ [英] how to draw a line on a image?

问题描述

我要画一个BMP图像是传递到方法在C＃中使用的DrawLine方法就行

i want to draw a line on a bmp image which is pass into a method using drawline method in C#

public void DrawLineInt(Bitmap bmp)
{

Pen blackPen = new Pen(Color.Black, 3);

int x1 = 100;
int y1 = 100;
int x2 = 500;
int y2 = 100;
// Draw line to screen.
e.Graphics.DrawLine(blackPen, x1, y1, x2, y2);
}

这给了我error.So想知道如何在这里包括油漆事件
（PaintEventArgs的E）

this give a error.So i want to know how to include paint event here (PaintEventArgs e )

和也想知道如何传递参数的时候，我们调用drawmethod？
例如：

and also want to know how to pass parameters when we calling drawmethod? example

DrawLineInt(Bitmap bmp);

这给下面的错误
这个名字的'e'并不在目前情况下存在

this give the following error "The name 'e' does not exist in the current context "

推荐答案

画一个BMP图像是传递到方法在C＃中使用的DrawLine方法上一行

"Draw a line on a bmp image which is pass into a method using drawline method in C#"

PaintEventArgs的Ë会建议您在画图事件的对象时这样做。既然你是在方法调用这一点，那么你没有不需要添加任何地方PaintEventArgs的如

PaintEventArgs e would suggest that you are doing this during the "paint" event for an object. Since you are calling this in a method, then no you do not need to add PaintEventArgs e anywhere.

要做到这一点的方法，使用@贝丽的回答。

To do this in a method, use @BFree's answer.

public void DrawLineInt(Bitmap bmp)
{
    Pen blackPen = new Pen(Color.Black, 3);

    int x1 = 100;
    int y1 = 100;
    int x2 = 500;
    int y2 = 100;
    // Draw line to screen.
    using(var graphics = Graphics.FromImage(bmp))
    {
       graphics.DrawLine(blackPen, x1, y1, x2, y2);
    }
}

当对象是重绘画图事件引发的。更多信息请参阅：

The "Paint" event is raised when the object is redrawn. For more information see:

<一个href=\"http://msdn.microsoft.com/en-us/library/system.windows.forms.control.paint.aspx\">http://msdn.microsoft.com/en-us/library/system.windows.forms.control.paint.aspx

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