I have a application where is ball (ellipse) and 4 rectangles (each for edge of window). I try to write a app where ball is moving and bouncing from the edges. I don't know how to make a method where ball changes a direction when collision is true.
XAML:
<Window x:Class="naszybkodlatestu.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="320" Width="640">
<Canvas>
<Rectangle Name="boardTop"
Height="2"
Fill="Black"
Width="609" Canvas.Left="7" Canvas.Top="10"/>
<Rectangle Name="boardLeft"
Height="270"
Fill="Black"
Width="2" Canvas.Left="614" Canvas.Top="10"/>
<Rectangle Name="boardRight"
Height="269"
Fill="Black"
Width="2" Canvas.Left="7" Canvas.Top="12"/>
<Rectangle Name="boardBot"
Height="2"
Fill="Black"
Width="609" Canvas.Left="7" Canvas.Top="278" />
<Ellipse Name="ball"
Width="15"
Height="15"
Fill="Red"
Canvas.Left="303"
Canvas.Top="107"/>
</Canvas>
</Window>
C#:
DispatcherTimer dTimer;
private void InitTimer()
{
dTimer = new DispatcherTimer();
dTimer.Tick += new EventHandler(TickdTimer);
dTimer.Interval = new TimeSpan(0, 0, 0, 0, 1);
dTimer.Start();
}
public MainWindow()
{
InitializeComponent();
InitTimer();
InitMove();
}
private bool isMovingUp = false;
private bool isMovingDown = false;
private bool isMovingLeft = true;
private bool isMovingRight = false;
private double ballDirectionX = 0;
private double ballDirectionY = 0;
private double ballSpeed = 1;
private bool CollisionDetection()
{
if (CheckCollision(ball, boardBot) || CheckCollision(ball, boardRight) ||
CheckCollision(ball, boardTop) || CheckCollision(ball, boardLeft))
{
return true;
}
else return false;
}
public static bool CheckCollision(FrameworkElement a, FrameworkElement b)
{
Rect rect1 = new Rect((double)a.GetValue(Canvas.LeftProperty), (double)a.GetValue(Canvas.TopProperty), a.Width, a.Height);
Rect rect2 = new Rect((double)b.GetValue(Canvas.LeftProperty), (double)b.GetValue(Canvas.TopProperty), b.Width, b.Height);
if (rect1.IntersectsWith(rect2))
{
return true;
}
else return false;
}
private void InitMove()
{
if (isMovingDown)
{
ballDirectionY += ballSpeed;
}
if (isMovingUp)
{
ballDirectionY -= ballSpeed;
}
if (isMovingLeft)
{
ballDirectionX -= ballSpeed;
}
if (isMovingRight)
{
ballDirectionX += ballSpeed;
}
ball.SetValue(Canvas.TopProperty, ballDirectionY);
ball.SetValue(Canvas.LeftProperty, ballDirectionX);
}
So i tried smth like that in InitMove(). It's just a test code to show you what is a problem.
private void InitMove()
{
.......
if (CollisionDetection())
{
if (isMovingLeft)
{
isMovingLeft = false;
isMovingRight = true;
}
}
So ball changed direction from left to right. Ok for now.
Problem starts now when i want to put next "if".
private void InitMove()
{
.......
if (CollisionDetection())
{
if (isMovingLeft)
{
isMovingLeft = false;
isMovingRight = true;
}
if (isMovingRight)
{
isMovingRight = false;
isMovingLeft = true;
}
}
Now ball is passing by edge of rectangle and there is no bounce. So here is my problem.
How to make it right?
//EDIT
When i added else
if (isMovingLeft)
{
isMovingLeft = false;
isMovingRight = true;
}
else if (isMovingRight)
{
isMovingRight = false;
isMovingLeft = true;
}
ball just stopped at edge of a window.
//EDIT2
ok so i think i know how to do this thx to you
if (isMovingLeft)
{
isMovingLeft = false;
isMovingRight = true;
ballDirectionX += 2;
}
else if (isMovingRight)
{
isMovingRight = false;
isMovingLeft = true;
ballDirectionX -= 2;
}
So i added some move to push this ball out of wall collision. I dont see another way for now.
You should add a else
statement :
if (isMovingLeft)
{
isMovingLeft = false;
isMovingRight = true;
}
else if (isMovingRight)
{
isMovingRight = false;
isMovingLeft = true;
}