Topics

1

DotNet / (Help) User draw/paint pixels by pixels?

« on: March 30, 2015, 09:19:18 am »

Hi, I'm trying to create a paint software of sort. I was able to do it with the following code, however it proved to be super slow and seem to be very very inefficient; do you guys have any suggestion on how to improve it or to make it faster?

In Constructor:
 

imagePixels = new byte[1612900]; // 1612900 = 635 * 635 * 4

drawn = new SFML.Graphics.Image(635, 635, imagePixels);
drawnImage = new Texture(drawn);

In drawing loop: (toDraw is a sprite)

 

DrawWindow.DispatchEvents();
DrawWindow.Clear(SFML.Graphics.Color.Black);
ToDraw.Texture = drawnImage;
DrawWindow.Draw(ToDraw);
DrawWindow.Display();
 

In MouseMove:

 

private void OnMouseMove(object sender, MouseMoveEventArgs e)
        {
            RenderWindow window = (RenderWindow)sender;
            if (Mouse.IsButtonPressed(Mouse.Button.Left))
            {
                if (Mouse.GetPosition(DrawWindow).X >= 0 && Mouse.GetPosition(DrawWindow).Y > 0 && Mouse.GetPosition(DrawWindow).X < 635 && Mouse.GetPosition(DrawWindow).Y < 635)
                {
                    imagePixels[(Mouse.GetPosition(DrawWindow).Y * 635 + Mouse.GetPosition(DrawWindow).X) * 4] = MainViewer.Instance.PickedColor[0].R; // R?
                    imagePixels[(Mouse.GetPosition(DrawWindow).Y * 635 + Mouse.GetPosition(DrawWindow).X) * 4 + 1] = MainViewer.Instance.PickedColor[0].G; // G?
                    imagePixels[(Mouse.GetPosition(DrawWindow).Y * 635 + Mouse.GetPosition(DrawWindow).X) * 4 + 2] = MainViewer.Instance.PickedColor[0].B; // B?
                    imagePixels[(Mouse.GetPosition(DrawWindow).Y * 635 + Mouse.GetPosition(DrawWindow).X) * 4 + 3] = MainViewer.Instance.PickedColor[0].A; // A?
                    drawn = new SFML.Graphics.Image(635, 635, imagePixels);
                    drawnImage = new Texture(drawn);
                }
            }
        }
 

2

General / Scrollable chatbox/log box

« on: April 23, 2014, 05:52:24 am »

I'm trying to code a scrollable chatbox which include the up arrow, down arrow, and obviously a scroll inbetween the 2 to scroll the chat. Let put the detail of how I'm going to set up it aside, I'm running into a few problem on how to render the text and doing text wrap to new line.

So far I have in mind is that:

Pseudo code:

class LogMessage
public LogMessage(string msg)
{
CutMessageIntoABunchOfListBasedOnMaximumLength() // this will cut the log message into individual smaller string which is just long enough to fit in a text of the same width.
}

Draw(); // draw all the string in the list of string

I'm not so sure how to code the CutMessageIntoABunchOfListBasedOnMaximumLength at all

is there a specific way to get the amount of character in a string given a font and charactersize and the width?

THis is the first time I ever tried to recreate a scroll chatbox so my structure might be terribly bad, if you have any suggestion on how to code this, please do so

Thank you

3

DotNet / Handling event in c#

« on: July 28, 2013, 05:28:00 am »

As the title said, hwo do I handle event in c#? The C# pollevent is inaccessible due to its protection level, and the only thing available is DispatchEvent, which i dont know what to do

4

General / Draw speed

« on: July 24, 2013, 09:46:36 am »

Hi guy, I am making a RPG with SFML and window forms + C#'s picturebox toolbox. So umh, at the moment all my code run properly, they work as intended, but they are really slow;

Im not sure if it because of the way I code it, but my Tile Engine's Tile placement is extremely slow. Sometime it take up to 3 sec of unresponsive before the tile is actually placed. Sometime the program even crash from "not enough memory" and also crash my facebook messager skype and chrome. I am not an expert programmer, just a hobbyist so I do not have any knowledge on code optimization and such, so dont judge me on that. Here is the 2 functions that I think should have something to deal with the speed issue:

//The MapViewer class (which is abbreviated mv)

public void Render()
        {
            _mapWindow.Clear();

            foreach (TileLayer tl in _map.myLayer)
            {
                foreach (Tile t in tl.myTile)
                {                

                    Texture tx = new Texture(Editor.Instance.curGame.GM.myResource[Editor.Instance.curGame.TM.myTileset[t.TS].ID].myTexture);
                    Sprite sp = new Sprite(tx, new IntRect(t.srcX * Editor.Instance.curGame.TileX, t.srcY * Editor.Instance.curGame.TileY, t.Width, t.Height));
                    sp.Position = new Vector2f(t.plcX * Editor.Instance.curGame.TileX, t.plcY * Editor.Instance.curGame.TileY);
                    _mapWindow.Draw(sp);


                }
            }

            _mapWindow.Display();
        }



//In the actual form:

private void picMapViewer_Click(object sender, EventArgs e)
        {
            if (Map.myLayer.Count <= 0)
                return;

            //Editor.Instance.tilesetPick
            int pickedX = mv.getMouseLoc.X + mv.xOffSet;
            int pickedY = mv.getMouseLoc.Y + mv.yOffSet;
            if (pickedX >= Map.maxX * 32)
                pickedX = Map.maxX * 32 - 1;
            if (pickedY >= Map.maxY * 32)
                pickedY = Map.maxX * 32 - 1;

            pickedX /= 32;
            pickedY /= 32;

            Tile _newTile = new Tile(Editor.Instance.tilesetPick.PickedX, Editor.Instance.tilesetPick.PickedY, pickedX, pickedY, Editor.Instance.tilesetPick.CurTS, Editor.Instance.curGame.TileX, Editor.Instance.curGame.TileY, 100);
           
            if ((int)available[lstLayer.SelectedIndex].GetValue(pickedX, pickedY) < 0)
                Map.myLayer[lstLayer.SelectedIndex].addTile(_newTile);
            else
                Map.myLayer[lstLayer.SelectedIndex].addTile(_newTile, (int)available[lstLayer.SelectedIndex].GetValue(pickedX, pickedY));

            available[lstLayer.SelectedIndex].SetValue(Map.myLayer[lstLayer.SelectedIndex].myTile.Count - 1, pickedX, pickedY);

            mv.Render();

        }


 

Here is the program without the source code, try it and see it for yourself:

https://www.dropbox.com/s/3zw1jv7kag59ztq/Debug.rar

Thank you all