C# 在图片框中绘制颜色？
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Drawing Colors in a picturebox?
提问by
In C# i have a picturebox. i would like to draw 4 colors. The default will be white, red, green, blue. How do i draw these 4 colors stritched in this picbox? or should i have 4 picbox? in that case how do i set the rgb color?
在 C# 中，我有一个图片框。我想画4种颜色。默认为白色、红色、绿色、蓝色。我如何在这个 picbox 中绘制这 4 种颜色？还是我应该有 4 个 picbox？在这种情况下，我如何设置 rgb 颜色？
采纳答案by IRBMe
You need to specify what it is you would specifically like to draw. You can't draw a red - that makes no sense. You can, however, draw a red rectangle at location (0,0) which is 100 pixels tall and 100 wide. I will answer what I can, however.
您需要指定您特别想绘制的内容。你不能画红色——这没有意义。但是，您可以在位置 (0,0) 绘制一个高 100 像素、宽 100 像素的红色矩形。不过，我会尽我所能回答。
If you want to set the outline of a shape to a specific color, you would create a Penobject. If you want to fill a shape with a color, however, then you would use a Brush object. Here's an example of how you would draw a rectangle filled with red, and a rectangle outlined in green:
如果要将形状的轮廓设置为特定颜色，则可以创建Pen对象。但是，如果您想用颜色填充形状，则可以使用 Brush 对象。下面是一个示例，说明如何绘制一个用红色填充的矩形和一个用绿色勾勒出的矩形：
private void pictureBox_Paint(object sender, PaintEventArgs e)
{
Graphics graphics = e.Graphics;
Brush brush = new SolidBrush(Color.Red);
graphics.FillRectangle(brush, new Rectangle(10, 10, 100, 100));
Pen pen = new Pen(Color.Green);
graphics.DrawRectangle(pen, new Rectangle(5, 5, 100, 100));
}
回答by Fredrik M?rk
Add a PictureBox to the form, create an event handler for the paint event, and make it look like this:
在表单中添加一个 PictureBox，为 Paint 事件创建一个事件处理程序，并使其看起来像这样：
private void PictureBox_Paint(object sender, PaintEventArgs e)
{
int width = myPictureBox.ClientSize.Width / 2;
int height = myPictureBox.ClientSize.Height / 2;
Rectangle rect = new Rectangle(0, 0, width, height);
e.Graphics.FillRectangle(Brushes.White, rect);
rect = new Rectangle(width, 0, width, height);
e.Graphics.FillRectangle(Brushes.Red, rect);
rect = new Rectangle(0, height, width, height);
e.Graphics.FillRectangle(Brushes.Green, rect);
rect = new Rectangle(width, height, width, height);
e.Graphics.FillRectangle(Brushes.Blue, rect);
}
This will divide the surface into 4 rectangles and paint each of them in the colors White, Red, Green and Blue.
这会将表面分成 4 个矩形，并将每个矩形涂上白色、红色、绿色和蓝色。
回答by Oliver Hanappi
If you want to use non-predefined colors, then you need to get a Color object from the static method Color.FromArgb().
如果要使用非预定义的颜色，则需要从静态方法 Color.FromArgb() 中获取 Color 对象。
int r = 100;
int g = 200;
int b = 50;
Color c = Color.FromArgb(r, g, b);
Brush brush = new SolidBrush(c);
//...
Best Regards
Oliver Hanappi
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