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System.Drawing
Discussion on System.Drawing within the CO2 Programming forum part of the Conquer Online 2 category.
07/04/2010, 20:17
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#1
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System.Drawing
Not strong in this :L
Not good with Forms, Events and system.Drawing
Im making a key event draw a new Rectangle when the key is (Down) is pressed, but its not drawing a new rectangle when i press down continuously:
Code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
Graphics GE = Graphics.FromHwnd(this.Handle);
Pen PE = new Pen(Color.Black);
Rectangle NE = new Rectangle(15, 15, 20, 50);
if (e.KeyCode == Keys.Down)
{
NE.Y++;
GE.DrawRectangle(PE, NE);
}
}
Can you please point me in the right direction, even though i've probably got this completely wrong :L
Shouldn't this be drawing a new rectangle, but displaced in Y Direction by 1 everytime the Down key is pressed?
EDIT:
Tried doing:
Code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
Graphics GE = Graphics.FromHwnd(this.Handle);
Pen PE = new Pen(Color.Black);
Rectangle NE = new Rectangle(15, 15, 20, 50);
GE.DrawRectangle(PE, NE);
if (e.KeyCode == Keys.Down)
{
NE.OffSet(17,17);
}
}
To move the current shape drawn, but it doesn't move at all.
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07/04/2010, 21:03
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#2
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Join Date: Nov 2006
Posts: 805
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Quote:
Originally Posted by xScott
Not strong in this :L
Not good with Forms, Events and system.Drawing
Im making a key event draw a new Rectangle when the key is (Down) is pressed, but its not drawing a new rectangle when i press down continuously:
Code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
Graphics GE = Graphics.FromHwnd(this.Handle);
Pen PE = new Pen(Color.Black);
Rectangle NE = new Rectangle(15, 15, 20, 50);
if (e.KeyCode == Keys.Down)
{
NE.Y++;
GE.DrawRectangle(PE, NE);
}
}
Can you please point me in the right direction, even though i've probably got this completely wrong :L
Shouldn't this be drawing a new rectangle, but displaced in Y Direction by 1 everytime the Down key is pressed?
EDIT:
Tried doing:
Code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
Graphics GE = Graphics.FromHwnd(this.Handle);
Pen PE = new Pen(Color.Black);
Rectangle NE = new Rectangle(15, 15, 20, 50);
GE.DrawRectangle(PE, NE);
if (e.KeyCode == Keys.Down)
{
NE.OffSet(17,17);
}
}
To move the current shape drawn, but it doesn't move at all.
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Try doing this.
Code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
Graphics GE = Graphics.FromHwnd(this.Handle);
Pen PE = new Pen(Color.Black);
[B] int X = 10;
int Y = 10;[/B]
Rectangle NE = new Rectangle(15, 15, [B]X, Y[/B]);
if (e.KeyCode == Keys.Down)
{
Y++;
GE.DrawRectangle(PE, NE);
}
}
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07/05/2010, 01:26
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#3
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Join Date: Nov 2009
Posts: 322
Received Thanks: 63
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Quote:
Originally Posted by Ian*
Try doing this.
Code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
Graphics GE = Graphics.FromHwnd(this.Handle);
Pen PE = new Pen(Color.Black);
[B] int X = 10;
int Y = 10;[/B]
Rectangle NE = new Rectangle(15, 15, [B]X, Y[/B]);
if (e.KeyCode == Keys.Down)
{
Y++;
GE.DrawRectangle(PE, NE);
}
}
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didn't work ><
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07/05/2010, 02:42
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#4
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Join Date: Nov 2006
Posts: 805
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Do you have a Form1_Paint event?
Try putting that code in there and use key presses to draw.
haven't used System.Drawing for anything besides dmaps :P
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07/06/2010, 04:06
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#5
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Graphics are cleared each frame, so if you want a new one + the older ones, you'll have to store them in an array and redraw them all each frame.
edit: Surprised Ian did not know this :P
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07/06/2010, 11:03
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#6
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Quote:
Originally Posted by I.P
Graphics are cleared each frame, so if you want a new one + the older ones, you'll have to store them in an array and redraw them all each frame.
edit: Surprised Ian did not know this :P
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His problem is making it draw while he hold the key down :P
Don't think you have to clear anything, he'd just be drawing a rectangle that eventually becomes solid since it fills up so fast
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07/06/2010, 11:53
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#7
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Join Date: Dec 2009
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No but he will have to store his variables in an array and call them every time he needs them if you get what I mean
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07/06/2010, 12:12
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#8
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Join Date: Nov 2006
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Ah I see, I've only used Drawing for loading dmaps
So never had to do it that way lol.
Speaking of which i need to add those to my new bot >.>
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07/06/2010, 12:14
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#9
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Fun dun ^.^
better than watching video tutorials trust me ;D
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07/08/2010, 02:19
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#10
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What does this have to do with CO2?
The problem with your code and Ian*'s is that you're both redeclaring and reinstantiating the variables that depend on the Rectangle's location. You may alter those values at the bottom of that method, but you're losing those changes because either your Rectangle variable or your X and Y variables need to be declared at the class level.
It may be more preferable to use the and instead of using the UI's event dispatch thread. may provide you with some useful examples.
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