How to make lasers fly?

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I am using c# for winapp. Not for Unity or whatever.

C#

my class
{
        Lasers laser1 = new Lasers();
        Lasers laser2 = new Lasers(); 


        public Screen()
        {
            InitializeComponent();
            DoubleBuffered = true;
            this.Paint += new PaintEventHandler(Screen_Paint);

            Timer timerforLaser = new Timer();
            timerforLaser.Tick += new EventHandler(Timer_forLaser_Tick);
            timerforLaser.Interval = 100;
            timerforLaser.Start();

            ....
  
            laser1.Initialize();
            laser2.Initialize();
        }
 
        void Screen_Paint(object sender, PaintEventArgs e)
        {
            ........

            e.Graphics.DrawImage(laser1.Img0, laser1.Rectangle);//LaserPaint
            e.Graphics.DrawImage(laser2.Img0, laser2.Rectangle);//LaserPaint
        }
        void Timer_forLaser_Tick(object sender, EventArgs e)
        {
            laser1.ShootUp();
            laser2.ShootUp();
            this.Refresh(); //very Important -without him here nothing works
        }

        private void Screen_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Space)
            {
                laser1.New(Player.X, Player.Y);
                laser2.New(Player.X, Player.Y);
            }
            this.Refresh(); //very Important -without him here nothing works
        }
}

From the code i post, when I press Space key, it will create 2 lasers images on the screen and update them in the timer event.
The problem is that is creating them at once, and overlapped.
I want them created 1 after another. Like a burst. With a short time between each other. And no overlaps.
I imagine i must put a timer between the starting point of each laser somehow, as long as i keep pressed the Space key. Or a delay of some sort. And if i have to create 100 lasers, i will probably create an array that will contain all the lasers? I have no idea how to make this thing work.

Thank you kindly.

What I have tried:

everything

everything

everything

everything

everything

everything

Posted 11-Aug-17 18:29pm

_Q12_

Updated 11-Aug-17 19:23pm

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Graeme_Grant · Accepted Answer · 2017-08-11T19:15:00

Solution 1

Your code is doing exactly what you asked it to do ... draw both at the same time. If you want to draw each one individually, then you need a variable to track which laser is drawn for that timer cycle and then alternate... Something like...

C#

private bool isAlternate;

C#

void Screen_Paint(object sender, PaintEventArgs e)
{
    // ........
 
    if(isAlternate)
        e.Graphics.DrawImage(laser1.Img0, laser1.Rectangle);//LaserPaint
    else
        e.Graphics.DrawImage(laser2.Img0, laser2.Rectangle);//LaserPaint
}

void Timer_forLaser_Tick(object sender, EventArgs e)
{
    laser1.ShootUp();
    laser2.ShootUp();
    this.Refresh(); //very Important -without him here nothing works
    isAlternate = !isAlternate;
}

Posted 11-Aug-17 19:15pm

Graeme_Grant

Comments

_Q12_ 12-Aug-17 1:28am

heh, the laser is changing color if i put 2 diferent colors to see the effect. As the laser flies up, the color is changing per tick. Nice effect though :) the stroboscopic laser :)
I changed the laser2.Img0 into Img1 which is another color image.

_Q12_ 12-Aug-17 1:42am

i corrected it.
if (e.KeyCode == Keys.Space)
{
if (isAlternate)
laser1.New(Player.X, Player.Y);
else
laser2.New(Player.X, Player.Y);
isAlternate = !isAlternate;
}
now it shoots different lasers color every time i press space.
BUT....
if i keep pressed the Space key, it is not shooting the controlled burst i want. How to do that?

_Q12_ 12-Aug-17 2:02am

your answer is good and it helped.
But i want another variant if anyone can share it's thoughts.

_Q12_ 12-Aug-17 11:24am

Thank you.