I have one image and three vertices with its position and its texcoord.
How can I draw this textured triangle in a picturebox?
This is an image explaining what it is:
You can use a GraphicsPath and a TextureBrush:
// Create the triangle
GraphicsPath p = new GraphicsPath();
p.AddLine(triangleVertex1, triangleVertex2);
p.AddLine(triangleVertex2, triangleVertex3);
p.CloseFigure();
// Draw the triangle
Bitmap b = new Bitmap(pictureBox.ClientSize.Width, pictureBox.ClientSize.Height);
using(Graphics g = Graphics.FromImage(b), TextureBrush t = new TextureBrush(myImage)) {
g.FillPath(t, p);
}
// Finally, set the PictureBox's image
pictureBox.Image = b;
Related
I have a folder with images and I want to draw a rectangle from the top left corner
This is the code I am using:
Image image = Image.FromFile(path + $#"origimages\{item.ImageName}.jpg");
using (Graphics g = Graphics.FromImage(image))
{
Color customColor = Color.FromArgb(50, Color.Red);
SolidBrush shadowBrush = new SolidBrush(customColor);
g.FillRectangles(shadowBrush, new RectangleF[] { new RectangleF(0, 0, 100, 100) });
}
When I run this code over all my images, some images have the rectangle at the right up corner and some at the bottom right corner.
How can I fix that?
I'm using GMaps for using google maps on c#. I write latitude and langitude values and press the load button. Then the code put a marker(like arrow) that point. I want to rotate that marker for any degree like google maps'. I don't have any sensors so I can write the degree in a textbox and press a rotate button. How can i do that? This code shows how I create markers and put them into my map. I know bitmap a little but not too much and sorry for my bad english. I hope you'll understand what I want.
`double lat = Convert.ToDouble(txtLat.Text);
double lng = Convert.ToDouble(txtLong.Text);
map.Position = new PointLatLng(lat, lng);
//custom marker
Bitmap bmpMarker = (Bitmap)Image.FromFile("img/arrow.png");
PointLatLng point = new PointLatLng(lat, lng);
GMap.NET.WindowsForms.GMapMarker marker = new GMarkerGoogle(point, bmpMarker);
//1. Create a Overlay
GMapOverlay markers = new GMapOverlay("markers");
map.ZoomAndCenterMarkers("markers");
//2. Add all available markers to that Overlay
markers.Markers.Add(marker);
//3. Cover map with Overlay
map.Overlays.Add(markers);
//RotateImage(bmpMarker, 180.0f);
marker.ToolTipText = map.Position.ToString();`
Try to set the Bitmap image again with the rotation because it is not a reference type:
GMap.NET.WindowsForms.GMapMarker marker = new GMarkerGoogle(point, RotateImg(bmpMarker,45));
Suggestion to rotate the bitmap:
public Bitmap RotateImg(Bitmap bmpimage, float angle)
{
int w = bmpimage.Width;
int h = bmpimage.Height;
PixelFormat pf;
pf = bmpimage.PixelFormat;
Bitmap tempImg = new Bitmap(w, h, pf);
Graphics g = Graphics.FromImage(tempImg);
g.DrawImageUnscaled(bmpimage, 1, 1);
g.Dispose();
GraphicsPath path = new GraphicsPath();
path.AddRectangle(new RectangleF(0.0F, 0.0F, w, h));
Matrix mtrx = new Matrix();
mtrx.Rotate(angle);
RectangleF rct = path.GetBounds(mtrx);
Bitmap newImg = new Bitmap(Convert.ToInt32(rct.Width), Convert.ToInt32(rct.Height), pf);
g = Graphics.FromImage(newImg);
g.TranslateTransform(-rct.X, -rct.Y);
g.RotateTransform(angle);
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.DrawImageUnscaled(tempImg, 0, 0);
g.Dispose();
tempImg.Dispose();
return newImg;
}
I am attempting to retrieve the pixels under a polygon; however, I seem to be unable to correctly get all the pixels accurately. Below is the code I have:
private void DrawPolygon()
{
PointF[] pts = new PointF[]{new PointF(5.196057f, 4.13434839f), new PointF(5.528517f, 4.621298f), new PointF(7.073008f, 6.5661006f), new PointF(5.28491259f, 9.206118f), new PointF(4.80768776f, 6.595068f), new PointF(5.196057f, 4.13434839f)};
GraphicsPath gp = new GraphicsPath(FillMode.Alternate);
gp.AddPolygon(pts);
Bitmap bmp = Bitmap.FromFile("...");
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.None;
g.PixelOffsetMode = PixelOffsetMode.Half;
using (Brush b = new SolidBrush(Color.White))
{
g.FillPath(b, gp);
}
bmp.Save("...");
}
In the image below (left) you can see that several pixels under the polygon are excluded. Image on the right was the original with all pixels having a value. I feel that I am missing a setting in the 'Graphics', but I cannot figure out what.
I have read many question about this. But my question is little bit different. What i need to do crop image from screen.
There is my codes
Bitmap photo = new Bitmap(Screen.PrimaryScreen.Bounds.Width,Screen.primaryScreen.Bounds.Height)
Graphics gr = Graphics.FromImage(photo);
gr.CopyFromScreen(0,0,0,0 new size(foto.Width,foto.Height));
picturebox1.Image = photo;
And there my crop codes
Rectangle cropRec = new Rectangle(1,1,1,1);
Bitmap target = new Bitmap(cropRec.Width,cropRec.Height);
using(Graphics g = Graphics.FromImage(target))
{
g.DrawImage(photo,new Rentangle(0,0,target.Width,target.Height),cropRec,GraphicsUnit.Pixel);
}
I want to crop middle part of this photo and compare with itself.
Thanks n advance
To symmetrically crop your image as shown in the following sketch, try creating a Bitmap with margins in the X and Y axis and then cropping the screenshot image by using those margins in CopyFromScreen():
Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width - 2 * xmargin, Screen.PrimaryScreen.Bounds.Height - 2 * ymargin);
Graphics graphics = Graphics.FromImage(printscreen as Image);
graphics.CopyFromScreen(xmargin, ymargin, 0, 0, printscreen.Size);
I'm trying to draw a series of connected segments, but the curved segments seem to produce an artifact, whereby the outer side of the curve is not smooth at all, but very jagged. This is part of a GIS program I am making.
For these lines, the line itself needs to be quite wide, as this represents the range of data that can be collected on this line for the GIS data. There also has to be an area directly under the line where no data is collected. This also can be wide, but not as wide as the main line.
I have done this using a graphics path, which I then widen and use as a clipping region to block the area directly under the line. I then draw the actual line. The sample code below does this, with made up values for ease of regenerating.
This works fine with straight lines, but with curved lines there are very irregular shapes on the outside of the curves. I have no idea why this happens.
Any ideas would be much appreciated, cheers,
Greg
I made this sample code using a basic form with a picturebox and a button on it, whereby when I clicked the button it would execute this method:
private void drawCurvedLine()
{
//initialise the plot area:
Bitmap image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.BackgroundImage = image;
Graphics g = Graphics.FromImage(image);
//the width of the pen represents the width of a sonar swathe:
Pen widePen = new Pen(new SolidBrush(Color.FromArgb(80, Color.Blue)), 50);
PointF[] points = new PointF[4];
//first straight:
points[0] = new PointF(287.284149F,21.236269F);
points[1] = new PointF(183.638443F,406.936249F);
//second straight:
points[2] = new PointF(130.842773F, 515.574036F);
points[3] = new PointF(-1950.91321F, 3491.868F);
//graphics path for the line:
GraphicsPath gPath = new GraphicsPath();
gPath.AddLine(points[0], points[1]);
gPath.AddArc(new RectangleF(-445.464447F,3.84924316F,640.067444F,640.067444F), -(90 - 105.0412369999982F), 10.8775282F);
gPath.AddArc(new RectangleF(-445.464417F, 3.84915161F, 640.067444F, 640.067444F), -(90 - 115.91811484539707F), 10.8775091F);
gPath.AddLine(points[2], points[3]);
//widen the line to the width equal to what the fish will not be able to see:
gPath.Widen(new Pen(Color.White, 10));
//now exclude that widened line from the main graphics:
g.ExcludeClip(new Region(gPath));
//draw the swathe line:
g.DrawPath(widePen, gPath);
//reset the clipping for the next line:
g.ResetClip();
}
Try to use a separate GraphicsPath for excluded region:
private void drawCurvedLine()
{
//initialise the plot area:
Bitmap image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.BackgroundImage = image;
using(Graphics g = Graphics.FromImage(image))
{
PointF[] points = new PointF[4];
//first straight:
points[0] = new PointF(287.284149F, 21.236269F);
points[1] = new PointF(183.638443F, 406.936249F);
//second straight:
points[2] = new PointF(130.842773F, 515.574036F);
points[3] = new PointF(-1950.91321F, 3491.868F);
//graphics path for the line:
using(GraphicsPath gPath = new GraphicsPath())
{
gPath.AddLine(points[0], points[1]);
gPath.AddArc(new RectangleF(-445.464447F, 3.84924316F, 640.067444F, 640.067444F), -(90 - 105.0412369999982F), 10.8775282F);
gPath.AddArc(new RectangleF(-445.464417F, 3.84915161F, 640.067444F, 640.067444F), -(90 - 115.91811484539707F), 10.8775091F);
gPath.AddLine(points[2], points[3]);
//widen the line to the width equal to what the fish will not be able to see:
using(GraphicsPath innerPath = (GraphicsPath)gPath.Clone())
{
using(Pen pen = new Pen(Color.White, 10))
{
innerPath.Widen(pen);
}
//now exclude that widened line from the main graphics:
using(Region reg = new Region(innerPath))
{
g.ExcludeClip(reg);
//draw the swathe line:
//the width of the pen represents the width of a sonar swathe:
using(Pen widePen = new Pen(new SolidBrush(Color.FromArgb(80, Color.Blue)), 50))
{
g.DrawPath(widePen, gPath);
}
//reset the clipping for the next line:
g.ResetClip();
}
}
}
}
}
Set the smoothing mode properly on your Graphics instance. Take a look here.
Try setting the CompositingQuality, the InterpolationMode and the SmoothingMode properties to increase the quality of your Graphics object:
using(Graphics g = Graphics.FromImage(image))
{
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.AntiAlias;
//...
}