Filling an irregular shape

Question

Hello,

I am writing a paint application for Windows Mobile 5.0.

I need to fill an irregular shape with a particular color. I have found ways on the internet, but they are not for the .Net Compact Framework.

Can anyone please tell me how to do it in a SmartDevice project?

Thanks.

Answer 1

Hy

Maybe this helps:

 

Graphics..::.FillPolygon Method (Brush, array<Point>[]()[])

Fills the interior of a polygon defined by an array of points specified by Point structures.

http://msdn.microsoft.com/en-us/library/0df9swbe.aspx

 

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

public void FillPolygonPoint(PaintEventArgs e)
{

    // Create solid brush.
    SolidBrush blueBrush = new SolidBrush(Color.Blue);

    // Create points that define polygon.
    Point point1 = new Point(50, 50);
    Point point2 = new Point(100, 25);
    Point point3 = new Point(200, 5);
    Point point4 = new Point(250, 50);
    Point point5 = new Point(300, 100);
    Point point6 = new Point(350, 200);
    Point point7 = new Point(250, 250);
    Point[] curvePoints = {point1, point2, point3, point4, point5, point6, point7};

    // Draw polygon to screen.
    e.Graphics.FillPolygon(blueBrush, curvePoints);
}

Daniel

Answer 2

Hi LOBOMINATOR

You are exactly rite way.because of  you can build point array, then pass to
 

e.Graphics.DrawPolygon(Pen, Points);

it's draw outer line  for the Polygon.


thank you

Answer 3

Hi

I will not be knowing the shape I am going to fill. Its a raster paint application. The user will draw some arbitrary closed polygon with a pencil tool and may attempt to fill it.

I have used the 4-way flood fill algorithms to fill it out myself pixel by pixel, but its too slow. It taking 5 - 10 seconds to fill the bigger polygons. I'd really appreciate it if someone could tell me how to implement a better algorithm that fills in a practical amount of time (or almost instantly ), or if some function is available to do so.

Thanks..

Answer 4

Hy
But every time the user clicks on the screen you get new point coordinates which you can collect in a structure (like array of points) and if you have enough point information you can use Graphics.FillPolygon()...

Or am I missunderstanding you?

Daniel

Answer 5

You misunderstood me. There are various tools with which the user can draw stuff. After drawing many things, there might be several closed regions with different colors as 'boundaries'. I want to be able to fill those regions when the user uses the 'fill' tool and clicks somewhere.

Answer 6

What's the problem you are facing when porting the desktop code to mobile devices? For those classes/methods that are not included in .NET CF, you might have to P/Invoke native GDI functions.