http://billkerr2.blogspot.com/2007/11/how-to-make-space-invaders-in-etoys.ht...
I've written it up step by step, with screenshots on my blog
cheers, - Bill
On Nov 2, 2007 11:20 AM, Bill Kerr billkerr@gmail.com wrote:
thanks Bert, you are correct, I've got it working now
- Bill
On Nov 1, 2007 9:57 PM, Bert Freudenberg bert@freudenbergs.de wrote:
Hmm, why don't you let the bullet clean up itself when it reaches the edge of the screen?
"managing multiple bullets" seems the wrong approach to me, fire-and- forget would manage itself.
- Bert -
On Nov 1, 2007, at 4:29 , Bill Kerr wrote:
I've solved some of the problems but still have at least one big one
SUCCESS: Can move and shoot at the same time Can make a single sound when shooting Can simulate a key press
PROBLEMS: When I fire a second bullet the first bullet stops moving (main current problem) Can only create new bullets when an original bullet is on the screen (it would be nice to create from scratch but I suppose I can live with that)
Each new bullet is automatically named bullet1, bullet2, etc My script sets the timer running for a newBullet (Player variable) . So when a second bullet is created then the first bullet stops.
Each new bullet has its own player with it's own timer. So, what's a good way to manage firing multiple bullets and then tidying up as they reach the top of the screen or hit a target (without deleting all the siblings?) I'm finding that hard.
I've put my project here: http://www.squeakland.org/project.jsp?http://www.users.on.net/ ~billkerr/etoy/shooter1.010.pr
prime self getNewBullet setHeading: 0.0. self getNewBullet setY: self getY + 10. self getNewBullet setX: self getX
shoot World2 getLastKeystroke = '<up>' ~~ false ifTrue: [self setNewBullet: Bullet1 getNewClone. self prime. Bullet1 beep: 'clink'. Bullet1 startScript: #move. World2 setLastKeystroke: '<down>'] "simulate keypress"
move Gun1 getNewBullet forward: 5
(I haven't included the code that moves the gun left and right)
I do have a delete siblings script which I use to tidy up but it's not integrated:
deleteSiblings self tellAllSiblings: #delete
Some bits of Karl's tutorial are dated but it was very useful - thanks. I had to go through and put newBullet in everywhere, it didn't work by just replacing <gun prime> with <gun's new bullet prime>, which is what Karl's tutorial seems to do. I had to replace each line of the <gun prime> procedure code with <gun's new bullet prime>
At any rate, many thanks for the help
-- Bill Kerr http://billkerr2.blogspot.com/
On Oct 29, 2007 7:06 AM, Karl < karl.ramberg@comhem.se> wrote: Bill Kerr wrote:
I see making a shooter, eg. a space invaders simulation, as a nice first game activity for children, one that many find highly
motivating
I made a tutorial a long time ago about this. http://209.143.91.36/super/503
I think there are some issues with the layout of images and the text. Also it does not use keyboard but the joystick morph.
Karl
Squeakland mailing list Squeakland@squeakland.org http://squeakland.org/mailman/listinfo/squeakland