Sprite Collision Detection Help - GameCreators Forum

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PDesigns

10

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Joined: 31st Jul 2013

Location: Austin, Texas

Posted: 1st Aug 2013 00:06

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Hi there guys,

I am working on Tier 2 using Xcode to develop for iOS.

This line of code checks if the pointer was pressed, when its been pressed it collects data as to where. It then checks those values to the position of the sprite.

Im getting no errors or warnings, what am I doing wrong.

+ Code Snippet

float touch_X, touch_Y;
if(agk::GetPointerPressed() == 1){
			touch_X = agk::GetPointerX();
			touch_Y = agk::GetPointerY();
            
			if (agk::GetSpriteHit(touch_X, touch_Y) == BUG_INDEX){
				agk::PlaySound(1);
				bugHit++;
				drawNewBug();
			}
		}

Thanks
Georhe

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easter bunny

11

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Joined: 20th Nov 2012

Playing: Dota 2

Posted: 1st Aug 2013 10:19

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is it returning 0?

perhaps you should use agk::GetSpriteHitTest(SpriteID,x,y); and scan each individual sprite

have you moved the viewport at all? maybe use agk::ScreenToWorldX(GetPointerX());

Dodge those Balls, awesomest app on the Play Store

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Hodgey

14

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Joined: 10th Oct 2009

Location: Australia

Posted: 1st Aug 2013 10:49

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@PDesigns: what exactly is the problem and what is supposed to happen? Also which version of AppGameKit are you using?

Also, is GetPointerPressed definitely what you're after, as opposed to GetPointerState() (repeatedly returns 1 while being pressed)?

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PDesigns

10

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Joined: 31st Jul 2013

Location: Austin, Texas

Posted: 1st Aug 2013 20:48

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Thanks for the replies.

I am using the most recent version with Xcode developing for iOS

Here is the code with GetPointerState

+ Code Snippet

	float touch_X, touch_Y;
    
	if(agk::Timer() < MAX_TIMER){
        
		if(agk::GetPointerState() ){
			touch_X = agk::GetPointerX();
			touch_Y = agk::GetPointerY();
            
			if (agk::GetSpriteHit(touch_X, touch_Y) == BUG_INDEX){
				agk::PlaySound(1);
				bugHit++;
				drawNewBug();
			}
		}
	}

When the user has touched the screen the statement should run collecting the values for where the pointer was pressed. It then runs those values where the pointer was pressed to see if it matches the Bug Sprite location (Which is random)

If it has hit the bug then a sound will play, score added too and a new bug generated.

I am not sure how to tell what the GetPointerState() function is returning

Hope that helps a little

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Hodgey

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Joined: 10th Oct 2009

Location: Australia

Posted: 2nd Aug 2013 00:05 Edited at: 2nd Aug 2013 00:06

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Quote: "I am not sure how to tell what the GetPointerState() function is returning"

You can simply print them with the agk:: Print(); command. Chuck this in your app::Loop(), it's very important for you to know what they're returning.

+ Code Snippet

agk::PrintC("Pressed: "); agk::Print(agk::GetPointerPressed());
agk::PrintC("State: "); agk::Print(agk::GetPointerState());

One important thing to remember about the GetSpriteHit command is that it will return the most front/top sprite. If you have a sprite overlapping your target sprite then it may return that overlapping sprite. GetSpriteHitTest may be worth a shot.

Oh, and welcome to the forums.

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PDesigns

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Joined: 31st Jul 2013

Location: Austin, Texas

Posted: 2nd Aug 2013 00:33

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Thank you Hodgey!

GetSpriteHitTest() worked like a charm!

So far AppGameKit has been a wonder, looking forward to working on some games

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AppGameKit Classic Chat / Sprite Collision Detection Help