一个像素长线 [英] A One Pixel Long Line
问题描述
我尝试定义一个长度为1个单位（1个像素）的行，实际上，
只是屏幕上的一个点。但是当我使用宽笔和
适当的StartCap和EndCap（Round）绘制时，它会显示为一个点。
我能想到的一种定义1像素长行的方法，但它很丑陋，而且b $ b笨拙。
我从给定像素的X和Y坐标中减去.5首先
System.Drawing.PointF结构，并将.5添加到其他PointF结构。它好像b $ b似乎有效（见下面的代码），但感觉不是很好。
有没有标准的方法来获取一条线单位长度1？
//名称空间OnePixelLine
名称空间OnePixelLine
{
//类表格
类表格：System.Windows.Forms.Form
{
//一个不会产生输出的整数类型点
System.Drawing.Point point0 = new System.Drawing.Point（50,50）;
//两个产生2像素长行的整数类型点
System.Drawing.Point point1 = new System.Drawing.Point（100,100）;
System.Drawing.Point point2 = new System.Drawing.Point（101,101）;
//产生1像素长行的两个浮点类型点，但它很难看
System.Drawing.PointF pointf1 = new System.Drawing.PointF（149.5 f，149.5f）;
System.Drawing.PointF pointf2 = new System.Drawing.PointF（150.5f，150.5f）;
// a笔
System.Drawing.Pe n pen = new System.Drawing.Pen（System.Drawing.Color.Red）;
//构造函数
表格（）
{
//加宽笔。删除它以检查线条的长度
pen.Width = 9;
//将StartCap和EndCap设置为Round
pen。 StartCap = System.Drawing.Drawing2D.LineCap.Roun d;
pen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
//为paint做准备/>
Paint + = new System.Windows.Forms.PaintEventHandler（OnPaint）;
}
// OnPaint
void OnPaint（对象a，System.Windows.Forms.PaintEventArgs b）
{
//这个什么都不输出
b.Graphics.DrawLine（pen，point0，point0）;
//这会输出一条2像素长的行
b.Graphics.DrawLine（pen ，point1，point2）;
//这会输出一条1像素长的行，但它很笨拙
b.Graphics.DrawLine（pen，pointf1，pointf2）; < br $>
}
// Main
public static void Main（）
{
System.Windows.Forms.Application.Run（new Form（））;
}
}
}
" Martijn Mulder" < I @ M>在消息中写道
news：44 *********************** @ news.wanadoo.nl ...我尝试定义一个长度为1个单位（1个像素）的线，实际上，它只是屏幕上的一个点。但是当我用宽大的笔用适当的StartCap和EndCap（Round）绘制它时，它会显示为一个点。
我可以想到一种定义1像素的方法排长队，但它很难看，而且很笨拙。
我从给定像素的X和Y坐标中减去.5的第一个
System.Drawing.PointF结构，并添加.5到其他PointF结构。
它似乎有用（见下面的代码），但感觉不好。
是否有标准方法可以获得单位长度为1的线？
你不能只画一个像素吗？
//命名空间OnePixelLine
名称空间OnePixelLine
$
//类表格
类表格：System.Windows.Forms.Form
{b / b
//一个不会产生输出的整数类型点 System.Drawing.Point point0 = new System.Drawing.Point（50,50）;
//生成2像素长行的两个整数类型点
System.Drawing.Point point1 = new System.Drawing.Point（100,100）;
System.Drawing.Point point2 = new System.Drawing.Point（101,101）;
//生成1的两个浮点型点-pixel长行，但很难看。
System.Drawing.PointF pointf1 = new System.Drawing.PointF（149.5f，149.5f）;
System.Drawing.PointF pointf2 = new System.Drawing。 PointF（150.5f，150.5f）;
//一支笔
System.Drawing.Pen pen = new System.Drawing.Pen（System.Drawing.Color.Red）;
//构造函数
表格（）
//
//加宽笔。删除它以检查线条的长度
pen.Width = 9;
//将StartCap和EndCap设置为Round
pen.StartCap = System.Drawing.Drawing2D。 LineCap.Roun d;
pen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
//为油漆做准备
Paint + = new System.Windows.Forms.PaintEventHandler （OnPaint）;
}
// OnPaint
void OnPaint（对象a，System.Windows.Forms.PaintEventArgs b）
{
//这个什么都不输出
b.Graphics.DrawLine（pen，point0，point0）;
//这个输出一条2像素长的线
b .Graphics.DrawLine（pen，point1，point2）;
//这个输出一行1像素长，但它很笨拙
b.Graphics.DrawLine（pen，pointf1，pointf2） ;
}
//主要
public static void Main（）
{
System.Windows.Forms.Application.Run（new Form（） ）;
}
}
< snip>有没有一种标准的方法来获得单位长度为1的线？
你不能只画一个像素吗？
不，我需要它作为一条线来进行热门测试。
或者你知道一种方法来获得
1.对像素进行点击测试？ （使用宽笔）
2.绘制单个像素？
" Martijn Mulder" < I @ M>在消息中写道
news：44 *********************** @ news.wanadoo.nl ...< snip>是否有标准的方法来获取单位长度为1的行？
难道你不能画一个像素吗？
不，我需要它作为一条线来对它进行点击测试。
或者你知道吗？的方式
1.对像素进行命中测试？ （用宽笔）
2.绘制单个像素？
你是什么意思？这是框架中的功能还是你写的东西？
I try to define a line with the length of 1 unit (1 pixel) that is, in fact,
just a point on the screen. But when I draw it with a wide pen with the
appropriate StartCap and EndCap (Round), it will appear as a dot.
I can think of a way to define a 1-pixel long line but it is ugly and
clumsy.
I subtract .5 from the given pixel''s X and Y coordinate for the first
System.Drawing.PointF structure, and add .5 to the other PointF stucture. It
seems to work (see the code below), but it doesn''t feel good.
Is there a standard way to obtain a line with unit length 1?
//namespace OnePixelLine
namespace OnePixelLine
{
//class Form
class Form:System.Windows.Forms.Form
{
//one integer type point that won''t produce output
System.Drawing.Point point0=new System.Drawing.Point(50,50);
//two integer type points that produce 2-pixels long line
System.Drawing.Point point1=new System.Drawing.Point(100,100);
System.Drawing.Point point2=new System.Drawing.Point(101,101);
//two float type points that produce 1-pixel long line, but it is ugly
System.Drawing.PointF pointf1=new System.Drawing.PointF(149.5f,149.5f);
System.Drawing.PointF pointf2=new System.Drawing.PointF(150.5f,150.5f);
//a pen
System.Drawing.Pen pen=new System.Drawing.Pen(System.Drawing.Color.Red);
//constructor
Form()
{
//widen pen. Remove this to check the length of the lines
pen.Width=9;
//set StartCap and EndCap both to Round
pen.StartCap=System.Drawing.Drawing2D.LineCap.Roun d;
pen.EndCap=System.Drawing.Drawing2D.LineCap.Round;
//prepare for paint
Paint+=new System.Windows.Forms.PaintEventHandler(OnPaint);
}
//OnPaint
void OnPaint(object a,System.Windows.Forms.PaintEventArgs b)
{
//this outputs nothing
b.Graphics.DrawLine(pen,point0,point0);
//this outputs a line 2 pixels long
b.Graphics.DrawLine(pen,point1,point2);
//this outputs a line 1 pixel long, but it is clumsy
b.Graphics.DrawLine(pen,pointf1,pointf2);
}
//Main
public static void Main()
{
System.Windows.Forms.Application.Run(new Form());
}
}
}
"Martijn Mulder" <i@m> wrote in message
news:44***********************@news.wanadoo.nl...I try to define a line with the length of 1 unit (1 pixel) that is, in
fact,
just a point on the screen. But when I draw it with a wide pen with the
appropriate StartCap and EndCap (Round), it will appear as a dot.
I can think of a way to define a 1-pixel long line but it is ugly and
clumsy.
I subtract .5 from the given pixel''s X and Y coordinate for the first
System.Drawing.PointF structure, and add .5 to the other PointF stucture.
It
seems to work (see the code below), but it doesn''t feel good.
Is there a standard way to obtain a line with unit length 1?
Can''t you just draw a pixel?
//namespace OnePixelLine
namespace OnePixelLine
{
//class Form
class Form:System.Windows.Forms.Form
{
//one integer type point that won''t produce output
System.Drawing.Point point0=new System.Drawing.Point(50,50);
//two integer type points that produce 2-pixels long line
System.Drawing.Point point1=new System.Drawing.Point(100,100);
System.Drawing.Point point2=new System.Drawing.Point(101,101);
//two float type points that produce 1-pixel long line, but it is ugly
System.Drawing.PointF pointf1=new System.Drawing.PointF(149.5f,149.5f);
System.Drawing.PointF pointf2=new System.Drawing.PointF(150.5f,150.5f);
//a pen
System.Drawing.Pen pen=new System.Drawing.Pen(System.Drawing.Color.Red);
//constructor
Form()
{
//widen pen. Remove this to check the length of the lines
pen.Width=9;
//set StartCap and EndCap both to Round
pen.StartCap=System.Drawing.Drawing2D.LineCap.Roun d;
pen.EndCap=System.Drawing.Drawing2D.LineCap.Round;
//prepare for paint
Paint+=new System.Windows.Forms.PaintEventHandler(OnPaint);
}
//OnPaint
void OnPaint(object a,System.Windows.Forms.PaintEventArgs b)
{
//this outputs nothing
b.Graphics.DrawLine(pen,point0,point0);
//this outputs a line 2 pixels long
b.Graphics.DrawLine(pen,point1,point2);
//this outputs a line 1 pixel long, but it is clumsy
b.Graphics.DrawLine(pen,pointf1,pointf2);
}
//Main
public static void Main()
{
System.Windows.Forms.Application.Run(new Form());
}
}
}
<snip>Is there a standard way to obtain a line with unit length 1?Can''t you just draw a pixel?
No, I need it as a line to do hit testing on it.
Or do you know a way to
1. to do a hit test on a pixel? (with a wide pen)
2. to draw an individual pixel?
"Martijn Mulder" <i@m> wrote in message
news:44***********************@news.wanadoo.nl...<snip>Is there a standard way to obtain a line with unit length 1?Can''t you just draw a pixel?
No, I need it as a line to do hit testing on it.
Or do you know a way to
1. to do a hit test on a pixel? (with a wide pen)
2. to draw an individual pixel?
What do you mean by hittest? Is this a function in the framework or
something you''ve written?
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