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();
}
Related
I am trying to draw a Rectangle on a PictureBox, but when I click on another location the Rectangle moves to the new location. I would like to keep the original Rectangle and draw a new Rectangle at the given coordinates.
private void PictureBox_Paint(...)
Pen pen = new Pen(Color.Red, 3);
Rectangle rect = new Rectangle(x - 20, y - 10, 40, 20);
e.Graphics.DrawRectangle(pen, rect);
You need to add your Rectangles to a list of rectangles.
To do so just replace :
OnClick
Rectangle rect = new Rectangle(x - 20, y - 10, 40, 20);
Draw
e.Graphics.DrawRectangle(pen, rect);
With :
OnClick
myRectangleCollection.Add(new Rectangle(x - 20, y - 10, 40, 20));
Draw
foreach(Rectangle rect in myRectangleCollection)
{
e.Graphics.DrawRectangle(pen, rect);
}
Just don't forget to initialize your List of rectangles in your form initialization with this :
List<Rectangle> myRectangleCollection = new List<Rectangle>();
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);
}
I have created a venn diagram which looks like this,
I have also created regions for handling clicks on each part of venn. Left / Right and common two parts. Here is the code I have,
private void panelControlVennDiagram_Paint(object sender, PaintEventArgs e)
{
Rectangle leftVenn = new Rectangle(20, 50, 130, 130);
Rectangle rightVenn = new Rectangle(60, 50, 130, 130);
commonRegion = new Region();
Pen pen = new Pen(Color.Black,3);
using (Brush brushLeft = new SolidBrush(leftVennColor))
{
ellipseLeftOnlyPath.AddEllipse(leftVenn);
leftOnlyRegion = new Region(ellipseLeftOnlyPath);
e.Graphics.FillEllipse(brushLeft, leftVenn);
e.Graphics.DrawEllipse(pen, leftVenn);
brushLeft.Dispose();
}
using (Brush brushRight = new SolidBrush(rightVennColor))
{
ellipseRightOnlyPath.AddEllipse(rightVenn);
rightOnlyRegion = new Region(rightVenn);
e.Graphics.FillEllipse(brushRight, rightVenn);
e.Graphics.DrawEllipse(pen, rightVenn);
brushRight.Dispose();
}
using (GraphicsPath circle_path = new GraphicsPath())
{
circle_path.AddEllipse(leftVenn);
commonRegion.Intersect(circle_path);
}
using (GraphicsPath circle_path = new GraphicsPath())
{
circle_path.AddEllipse(rightVenn);
commonRegion.Intersect(circle_path);
}
leftOnlyRegion.Exclude(commonRegion);
rightOnlyRegion.Exclude(commonRegion);
using (Brush brushCommon = new SolidBrush(commonColor))
{
e.Graphics.FillRegion(brushCommon, commonRegion);
brushCommon.Dispose();
}
using (Brush brushLeftOnly = new SolidBrush(leftRightCommonColor))
{
ellipseLeftRightCommonPath.AddEllipse(65, 80, 35, 40);
e.Graphics.FillEllipse(brushLeftOnly, 65, 80, 35, 40);
e.Graphics.DrawEllipse(pen, 65, 80, 35, 40);
brushLeftOnly.Dispose();
}
using (Brush brushRightOnly = new SolidBrush(rightLeftCommonColor))
{
ellipseRightLeftCommonPath.AddEllipse(105, 110, 35, 40);
e.Graphics.FillEllipse(brushRightOnly, 105, 110, 35, 40);
e.Graphics.DrawEllipse(pen, 105, 110, 35, 40);
brushRightOnly.Dispose();
}
Brush brush = new SolidBrush(Color.Black);
Font stringFont = new Font("Calibri", 9, FontStyle.Bold);
Font stringFontCommon = new Font("Calibri", 8, FontStyle.Bold);
e.Graphics.DrawString(leftValue.ToString(), stringFont, brush, 40, 90);
e.Graphics.DrawString(rightValue.ToString(), stringFont, brush, 160, 90);
e.Graphics.DrawString(leftRightValue.ToString(), stringFontCommon, brush, 70, 115);
e.Graphics.DrawString(rightLeftValue.ToString(), stringFontCommon, brush, 110, 115);
brush.Dispose();
stringFont.Dispose(); stringFontCommon.Dispose();
pen.Dispose();
}
This is to handle the mouse clicks. Basically I want to have a click handled only on left / right parts and not their intersection. But even with this I dont get the message box. Sometimes if I put a break point it does hit messagebox code but sometimes not.
private void panelControlVennDiagram_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
if (ellipseLeftRightCommonPath.IsVisible(e.Location))
MessageBox.Show("Left - Right Common");
else if (ellipseRightLeftCommonPath.IsVisible(e.Location))
MessageBox.Show("Right - Left Common");
else if (leftOnlyRegion.IsVisible(e.Location))
MessageBox.Show("Left Only");
else if (rightOnlyRegion.IsVisible(e.Location))
MessageBox.Show("Right Only");
}
}
Whats wrong here? Please help.
I used directly regions rather than using GraphicsPath.. It works .
leftOnlyRegion = new Region(leftVenn);
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 trying to move a drawn graphics item, I can draw them just fine. but when I try to move it, it just draws another item over the original. I have tried Invalidate, and pictureBox1.Invalidate. still no luck just prints both items to the pictureBox.
Thanks for any suggestions.
private void button1_Click(object sender, EventArgs e)
{
count++;
button1.Text = "Move";
if (count == 1)
{
car();
}
else if (count == 2)
{
car1();
}
}
public void car()
{
Invalidate();
g = pictureBox1.CreateGraphics();
g.DrawEllipse(pen1, 50, 125, 30, 30);
g.DrawEllipse(pen1, 150, 125, 30, 30);
g.DrawRectangle(pen2, 45, 75, 140, 50);
g.DrawLine(pen2, 65, 75, 80, 35);
g.DrawLine(pen2, 80, 35, 140, 35);
g.DrawLine(pen2, 140, 35, 160, 75);
// Create string to draw.
String drawString = "Price: "+(cost).ToString("C");
// Create font and brush.
Font drawFont = new Font("Arial", 16);
SolidBrush drawBrush = new SolidBrush(Color.Black);
// Create point for upper-left corner of drawing.
PointF drawPoint = new PointF(50, 95);
// Draw string to screen.
g.DrawString(drawString, drawFont, drawBrush, drawPoint);
}
public void car1()
{
Invalidate();
g = pictureBox1.CreateGraphics();
g.DrawEllipse(pen1, 50 + m, 125, 30 , 30 );
g.DrawEllipse(pen1, 150 + m, 125, 30 , 30);
g.DrawRectangle(pen2, 45 + m, 75, 140, 50 );
g.DrawLine(pen2, 65 + m, 75, 80 + m, 35);
g.DrawLine(pen2, 80 + m, 35, 140 + m, 35);
g.DrawLine(pen2, 140 + m, 35, 160 + m, 75);
// Create string to draw.
String drawString = "Price: " + (cost).ToString("C");
// Create font and brush.
Font drawFont = new Font("Arial", 16);
SolidBrush drawBrush = new SolidBrush(Color.Black);
// Create point for upper-left corner of drawing.
PointF drawPoint = new PointF(50 + m, 95);
// Draw string to screen.
g.DrawString(drawString, drawFont, drawBrush, drawPoint);
}
Move your code to the Paint event of the picturebox and use the graphics object from the available arguments.
private void pictureBox1_Paint(object sender, PaintEventArgs e) {
e.Graphics.Clear(Color.White);
if (count == 1)
DrawCar1(e.Graphics);
if (count == 2)
DrawCar2(e.Graphics);
}
public void DrawCar1(Graphics g)
{
g.DrawEllipse(pen1, 50, 125, 30, 30);
g.DrawEllipse(pen1, 150, 125, 30, 30);
// etc.
}
public void DrawCar2(Graphics g)
{
// etc.
}
private void button1_Click(object sender, EventArgs e)
{
count++;
button1.Text = "Move";
pictureBox.Invalidate();
}
Your code never cleared the PictureBox, just the form, but it's a mistake to use CreateGraphics() because that is just a temporary canvas. Any drawing using that method gets wiped out when you minimize the form, for instance.
Your code should probably be refactored into having a "Car" class. Having a Car1 and a Car2 drawing routine isn't very practical. If you want to keep moving it, you don't want to keep adding more Car# routines. Create a single drawing routine for the car and keep the location information in the "Car" class so you know "where" you want the car drawn.