I have several outputs for my datas and want to create one fill-Object for any output-possibility. For example PrintDocument and Bitmap. Thats works with Graphics-Object, but the result is different.
My test method for fill graphics:
protected void fillGraphics(Graphics g)
{
g.PageUnit = GraphicsUnit.Pixel;
Pen pen = new Pen(Brushes.Black, 3);
g.DrawRectangle(pen, 100, 100, 300, 300);
g.DrawString("Wichtig!", new System.Drawing.Font(FontFamily.GenericSansSerif, 16), new SolidBrush(Color.Black), 120, 120);
}
Related
I need to draw a rectangle that should be around the size 2X2 Inches when printed on a paper.
I know that i can draw a rectangle using
g.DrawRectangle(pen, 100,100, 100, 200);
This application will only be used in computers.How can i convert the inches to pixels properly so that i can get the desired dimensions when printed.
To make an image print in the right size by default, it needs to have the right combination of dpi and pixels.
Let's look at an example:
// aiming at 150dpi and 4x6 inches:
float dpi = 150;
float width = 4;
float height = 6;
using (Bitmap bmp = new Bitmap((int)(dpi * width), (int)(dpi * height)))
{
// first set the resolution
bmp.SetResolution(dpi, dpi);
// then create a suitable Graphics object:
using (Graphics G = Graphics.FromImage(bmp))
using (Pen pen = new Pen(Color.Orange))
{
pen.Alignment = System.Drawing.Drawing2D.PenAlignment.Center;
G.Clear(Color.FloralWhite);
// using pixels here:
Size sz = new System.Drawing.Size((int)dpi * 2 - 1, (int)dpi * 2 - 1);
G.DrawRectangle(pen, new Rectangle(new Point(0, 0), sz));
G.DrawRectangle(pen, new Rectangle(new Point(0, 300), sz));
G.DrawRectangle(pen, new Rectangle(new Point(0, 600), sz));
G.DrawRectangle(pen, new Rectangle(new Point(300, 0), sz));
G.DrawRectangle(pen, new Rectangle(new Point(300, 300), sz));
G.DrawRectangle(pen, new Rectangle(new Point(300, 600), sz));
// alternative code:
// we can also set the Graphics object to measure stuff in inches;
G.PageUnit = GraphicsUnit.Inch;
// or fractions of it, let's use 10th:
G.PageScale = 0.1f;
using (Pen pen2 = new Pen(Color.MediumPurple, 1f / dpi * G.PageScale))
{
// draw one rectangle offset by an inch:
G.DrawRectangle(pen2, 10f, 10f, 20f, 20f);
}
bmp.Save(#"D:\xxx.jpg", ImageFormat.Jpeg);
}
}
Note that I had to subtract 1 pixel from the drawn size as DrawRectangle overdraws by 1 pixel!
Note that the coordinates I draw at depend on the resolution! Also note how the jpeg format creates a lot of smeared colors. Pngcreates crisper results, especially once you print text..
Also note how I had to scale down the PenWidth in the alternative code!
I have problem with draw two polygons.
I want to fill two triangles, but one is greater than the second.
I am using UserControl in winforms.
Code:
Point[] DOWN = new Point[] {new Point(0, 0), new Point(10, 0), new Point(5, 5)};
Point[] UP = new Point[] { new Point(0, 15), new Point(10, 15), new Point(5, 10) };
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
SolidBrush brush = new SolidBrush(Color.FromArgb(253, 198, 19));
e.Graphics.FillPolygon(brush, DOWN);
e.Graphics.FillPolygon(brush, UP);
brush.Dispose();
}
Where is problem?
Try setting the PixelOffsetMode property:
e.Graphics.PixelOffsetMode = PixelOffsetMode.Half;
using (SolidBrush brush = new SolidBrush(Color.FromArgb(253, 198, 19))) {
e.Graphics.FillPolygon(brush, DOWN);
e.Graphics.FillPolygon(brush, UP);
}
Result:
Try keeping the order counter-clockwise and start from the highest point:
new Point(5, 10), new Point(10, 15), new Point(0, 15)
Tell us if that helped. Sometimes those algorithms don't behave well on border conditions.
I have created some Ellipses on Windows form
I want that selectable while mouse over and if i select any ellipse it will delete from Window
Here some code for create ellipse in c#
public void DrawCircle_Paint(object sender, PaintEventArgs e)
{
Pen pen = new Pen(Color.Black, 3); Graphics gr = this.CreateGraphics(); gr.DrawEllipse(pen, 40, 45, 20, 20);
Pen pen2 = new Pen(Color.Black, 3); Graphics gr1 = this.CreateGraphics(); gr.DrawEllipse(pen2, 30, 25, 38, 20);
Pen pen3 = new Pen(Color.Black, 3); Graphics gr2 = this.CreateGraphics(); gr.DrawEllipse(pen3, 35, 36, 68, 15);
Pen pen4 = new Pen(Color.Black, 3); Graphics gr3 = this.CreateGraphics(); gr.DrawEllipse(pen4, 50, 60, 67, 35);
}
You could use
this.Invalidate();
That should clear them....
Either that, or
Graphics.Clear();
Edit:
Actually, another method be to have a boolean inside of your mouse on hover, and use that to dictate when to draw the elipse/not. As a general note, you should be putting the elipse drawing in an override of onpaint. Right now, currently, if you were to invalidate the screen (either by you, or by Windows), your shapes will disappear. An Example using on paint.
bool paint = false;
protected override void OnPaint(object sender, PaintEventArgs e)
{
if (paint)
{
Pen pen = new Pen(Color.Black, 3); Graphics gr = this.CreateGraphics(); gr.DrawEllipse(pen, 40, 45, 20, 20);
Pen pen2 = new Pen(Color.Black, 3); Graphics gr1 = this.CreateGraphics(); gr.DrawEllipse(pen2, 30, 25, 38, 20);
Pen pen3 = new Pen(Color.Black, 3); Graphics gr2 = this.CreateGraphics(); gr.DrawEllipse(pen3, 35, 36, 68, 15);
Pen pen4 = new Pen(Color.Black, 3); Graphics gr3 = this.CreateGraphics(); gr.DrawEllipse(pen4, 50, 60, 67, 35);
}
}
I don't remember the specific paramters for it, but in your OnMouseHover (where you want to turn off your elipse)
OnMouseHover(){
...
paint = false;
this.Invalidate();
}
I'd like to know how to paint User Control with background Transparency even if the user control is raised or moved at runtime.
my code is
private void UserControl1_Paint(object sender, PaintEventArgs e)
{
var g = e.Graphics;
g.Clear(Color.White);
g.SmoothingMode = SmoothingMode.HighQuality;//可以反锯齿
var rectBound = new Rectangle(0, 0, Width-1, Height-1);
var b = new SolidBrush(Color.FromArgb(0, 122, 204));
var rect = new Rectangle(2, 2, Width - 4, Height - 4);
if(!_isSelected)//FillRectangle
g.FillEllipse(b, rectBound);
else
g.FillEllipse(b, rect);
var pen = new Pen(Color.Yellow);
pen.DashStyle = DashStyle.DashDot;
g.DrawLine(pen,10,10,100,10);
pen.DashStyle = DashStyle.Dash;
g.DrawLine(pen, 10, 15, 100, 15);
pen.DashStyle = DashStyle.DashDotDot;
g.DrawLine(pen, 10, 20, 100, 20);
pen.DashStyle = DashStyle.Dot;
g.DrawLine(pen, 10, 25, 100, 25);
pen.DashStyle = DashStyle.Solid;
g.DrawLine(pen, 10, 30, 100, 30);
if (_isSelected)
{
pen = new Pen(Color.Black) { DashStyle = DashStyle.Dot, Width = 1 };
g.DrawRectangle(pen, rectBound);
}
}
and demo picture here
there will be a lot of User Controls Created at runtime,some of them maybe overlapped,then it should be clear the user control's background.how to do that?
I am looking forward to make a rosette using c# graphics...
Here is what I'm trying to achieve:
Rosette
Till now i did this:
Pen lapsi = new Pen(Color.Black, 3);
Rectangle katrori = new Rectangle(250, 200, 200, 200);
Rectangle katrori2 = new Rectangle(350, 200, 200, 200);
Rectangle katrori3 = new Rectangle(150, 200, 200, 200);
Rectangle katrori4 = new Rectangle(200, 110, 200, 200);
Rectangle katrori5 = new Rectangle(200, 285, 200, 200);
Rectangle katrori6 = new Rectangle(295, 110, 200, 200);
Rectangle katrori7 = new Rectangle(300, 282, 200, 200);
Graphics g = this.CreateGraphics();
g.DrawEllipse(lapsi, katrori); //kryesor
g.DrawEllipse(lapsi, katrori2); //djatht
g.DrawEllipse(lapsi, katrori3); //majt
g.DrawEllipse(lapsi, katrori4); //nalt-majt
g.DrawEllipse(lapsi, katrori5); //posht-majt
g.DrawEllipse(lapsi, katrori6); //nalt-djatht
g.DrawEllipse(lapsi, katrori7);//posht djatht
I have drawn 7 circles so far, but i only want to show the one in the middle containing rossete. How to get rid of those extra lines outside the main circle..
If someone can give me some lines of code and show me how this is done, I'll appreciate it.
Start with the rectangle for your center circle and Inflate() it by some percentage. Next, create a GraphicsPath() and add an ellipse to it using the inflated rectangle via AddEllipse(). Finally, CLIP your graphics surface using SetClip(). This will prevent anything outside that ellipse from being displayed:
Pen lapsi = new Pen(Color.Black, 3);
Rectangle katrori = new Rectangle(250, 200, 200, 200);
Rectangle katrori2 = new Rectangle(350, 200, 200, 200);
Rectangle katrori3 = new Rectangle(150, 200, 200, 200);
Rectangle katrori4 = new Rectangle(200, 110, 200, 200);
Rectangle katrori5 = new Rectangle(200, 285, 200, 200);
Rectangle katrori6 = new Rectangle(295, 110, 200, 200);
Rectangle katrori7 = new Rectangle(300, 282, 200, 200);
Graphics g = this.CreateGraphics();
Rectangle clippingRectangle = new Rectangle(katrori.Location, katrori.Size);
clippingRectangle.Inflate((int)(katrori.Width * .2), (int)(katrori.Width * .2));
System.Drawing.Drawing2D.GraphicsPath GP = new System.Drawing.Drawing2D.GraphicsPath();
GP.AddEllipse(clippingRectangle);
g.SetClip(GP);
g.DrawEllipse(lapsi, katrori); //kryesor
g.DrawEllipse(lapsi, katrori2); //djatht
g.DrawEllipse(lapsi, katrori3); //majt
g.DrawEllipse(lapsi, katrori4); //nalt-majt
g.DrawEllipse(lapsi, katrori5); //posht-majt
g.DrawEllipse(lapsi, katrori6); //nalt-djatht
g.DrawEllipse(lapsi, katrori7);//posht djatht
g.Dispose();
Here's my finished, clipped rosette: