How to fill part of the graphical figure - c#

So, I have some simple figure (circle, ellipse, rectangle of closed polygon) and I need to fill only part of it.
I mean, I have GraphicsPath or similar object (set of points) and now I can simply fill the whole figure with, for example, orange color.
What I need: user enters 25% and I fill only 25% of the figure, starting from some side (top/bottom).
Maybe, it will be nessesary to find some sub-figure or (bad idea, I know) check all the points in on the field and fill them (only those which inside figure) one by one untill their amount will be 1/4 from the area of the figure. But it won't be so fast especially when image is about 5-6000 pixels from one side.
Here's sample what I have now and what I need for 25%. Important: instead of 25% can be any value.
Project: C# .net 3.5 WinForms
UPD:
Basic usecase.
User draws a figure (circle, ellipse, rectangle, polygon)
User enters value from 0 to 100 (percents)
I fill figure from bottom to the top until I filled amount of area (!), which is equal to user's value
I'm open for any ideas even without code.

Related

Interactive(clickable) map

I have a map of a camping, this is it:
Now, on this map, there are a lot of camping places. And all of the places(yellow, pink and the striped yellow), need to be clickable.
So my question is, how would i achieve this? I was thinking about using SVG or something. Is this a good solution?
Basic idea: Create a color map to look up which spot the user has clicked.
To create that color map, start with the original map, overlay it with an empty bitmap and write a small tool application to help you:
it should let you paint a filled circle in a special color for each site spot
ideally those colors should allow you to re-construct the number and type of the places
upon each click the next color should be prepared
you don't need to match the place too exactly, but it is up to you to improve the colormap with a paint program; put the orginal map in a layer under it and use an eyedropper tool to get the right color and then draw the places a little better
as many of the places have consecutive numbers you can
count them up with each click
use an input box to set new starting numbers
For the actual application you should
hold the color map in memory
use the MouseClick of a PictureBox to get the coordinates of the place
multiply (or rather divide) those with the zoom factor
use GetPixel on the color map to get the color and then
extract the place number.
An ARGB color has 3 color bytes; two will suffice for the place numbers and you will still have one byte for the color coded types of places..
The zoom factor is 1f * PictureBox.clientSize.Width / PictureBox.Image.Width.
For best user experience I would use the PictureBox.MouseMove to look up the place in the color map and give feedback whenever the color changes, including setting and clearing the mouse cursor betwenn Hand and Default whenever the location is clickable, i.e. has a non-transparent color on the color map..
To avoid artifacts the color map must be stored asPNG , not as JPG!
If you want more info with the places you could (and should) create a Place class and hold a Dictionary<Color, Place> to look up Place by Color..
If you put the image in a PictureBox, say, you could use the MouseClick event.

Unable to fix Screen Resolution for different devices like projector,monitor of asp.net projet

I am working on project in ASP.NET WEB APPLICATION in which I am having problem with screen Resolution. Whenever I connect my project execution to different devices like from laptop to monitor or to Projector, the fields, labels, drop down lists and other are randomly displaced on the screen. I want to have same display look irrespective of the device on which the out put is being seen. I have seen so many ways but I couldn't find the one which suits my scenario.I want to adjust the out put to be displayed in same way when the resolution is changed that is like from 1024*768 to 1280*1024, etc. I want the out put to be spread across the entire screen in same manner irrespective of the resolution.In the project the resolution for all the controls is declared in measure of pixels not on percentage based.I don't want to change pixels into percentage that makes me to change every where in the project but by keeping them as pixels I want to adjust the resolution whenever it is changed so that the controls will be evenly displaced. Please help me with this.
Set up a displacefactor, that displaces "objects" on x, and y axis by a value calculated from the resolution. I'd check if the "object" is on the left or the right side of the screen (by getting the width of the screen and if its bigger than the half then displacefactor is poisitive, if not then its negative, and you displace the object on the x axis), you can do that with the height so you can displace them on the y axis. I can't be more specific because i can't program C# nor javascript, but i hope you understand what i'm trying to explain.

Emgu - How to extract the images likely to represent an icon or control from a screenshot?

I'm working on an experimental project in which the challenge is to identify and extract an image of the icon or control that the user is has clicked on/touched. The method I'm trying is as follows (I need some help with step 3):
1) Take a screen shot when the user clicks/touches the screen:
2) Apply edge detection:
3) Extract the possible icon images around the Point associated with the user's cursor (Don't know how to do this)
There are easier cases in which the mouse-over event will highlight the icon/control, which allows me to identify the control with a simple screen shot comparison (before and after mouse-over). The above method is specifically for cases in which the icon is not highlighted. I'm new to emgu, so if anyone has any pointers on how to better achieve this, I'm all ears.
Cheers! Matt
Instead of doing edge detection. Consider taking the following steps:
Only grab pixels which are within a certain radius of the point of the user's cursor. Create a new image with just these pixels.
Use thresholding to classify into foreground and background.
Calculate the centroid, (use mean x coordinate and mean y coordinate). Calculate deviation from the mean. Discard foreground pixels which are beyond a certain deviation from the mean. Eg: discard pixels that are more than 1.6 deviations from the mean.
(You may need to experiment with this step ).
Use a convex hull to find the area of the image with the icon in it.

Snake in C# - player can scale window - dividing manual-scaled window into identical squares

As part of my self-education of programming I decided to make a snake in C#. The problem I have is about the client size of the game form.
I want player to be able to scale the window of the game, which is divided into 25 x 25 grid (every coordinate is like "one pixel") - it means, that at any moment, the window is divided into 25 x 25 identical squares.
The problem I get is near this code:
int SquareSide = (ClientSize.Width / 25);
When I set the ClientSize strictly to for example 600 x 600, which is a multiple of 25, everything goes OK. But when I don't (for example by manual resizing, which can change the size to, for example, 711 x 711), it creates at the right side a 'strip', which seems to be the rest of pixels, which can't be used because we are dividing to integer number.
My question is - is there any not-extremely-hard way to achieve dividing ANY client size of form into 25 x 25 grid without this problem? I tried using double, but FillRectangle method doesn't accept it.
I hope my question is understandable and thank you for replies.
To tell you the truth, there is
g.FillRectangle(Brush b, RectangleF rect)
RectangleF is a rectangle whose coordinates are float.
So you can use:
float SquareSide = (ClientSize.Width * 1f / 25);
I would try to simply handle OnResize event of the window, and at the moment user finishes rezise it, force the size that program need for perfect fit of the grid.
So for example at the moment user releases mouse and you figure out that one dimensions of the window 711x711, bring it to nearest correct fit 700x700.
In this way you guarantee good user experience on different monitor resolutions and for you guarantee a correct fit of the grid you draw.
Hope this helps.
Switch to float coordinates for everything. Make sure your game looks OK when lines do not have whole pixel coordinates. Make sure you "find next cell" code also works with floats, including mouse position detection if needed.
The other approach is to be happy with integer coordinates (and cells of the same size) and make page layout flexible to accomodate some unused space for odd 711x711 layouts (i.e. just center the field and keep some variable width border).

how to divide console screen in four parts and each part work separately using C# [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
split a console in two parts for two outputs
I want to divide my console screen in four part and each part work separately,
I think in this we use thread but I am not getting how to use?
You can't just divide the console, but you have enough control over it to do it yourself.
See Console class reference. You can SetCursorPosition, set window position and size. Make your own method - something like WriteToArea(int area, string text). Track bounds of areas and wrap text to stay inside of area. Each area must have its own cursor position, track it too. And think how you will handle area overflow (or you need just four columns?)
Edit: I'm not going to give you fish, but here is your fishing rod ^_^
Get dimensions of console window (Console.WindowWidth) in columns
Divide that by four to get each area's width and calculate start and end column of each area. For example, if your console is 80 columns wide, you should get [0, 19], [20, 39], [40, 59], [60, 79] - these pairs are bounds of each area.
Next, store cursor position for each area (initially that would be [left bound, 0])
Implement method writeToArea(int area, String text):void. That's the hardest part. First, you SetCursorPosition into stored position for that area. Next, break text into parts that fit into area. Take into account how much space is left on current column. Write text with series of Console.Write, line by line. Then update cursor position for that area [CursorLeft, CursorTop].
Write, debug and have fun!
Well, theres libraries for this sort of thing. But you can't just split up the console window.
If you want more information about the library, check it out at sourceforge.

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