Changing a sprite when it is hit

General
1

Physic + Sprites

2

I need a code for this because I can’t change mine when it is hit

3

You might want to go into a bit of detail with your question, We can’t really understand what you are asking. I will try to answer what I think is your question.

I am complete beginner and learning through ignatz guides(thanks btw, really helpful), so i cant go into technical specifics. If you want to change your sprite then i am pretty sure that you will have to use an if statement, like so: If (name of a function that means object is hit) then (another function that changes the animation). Something along that line, i cant go into anymore specifics myself, if you need more indepth insight then look into some guides. Like i said, i am a beginner myself so i cant go into technicalities. If you need to be pointed toward some guides just ask.

4 

function setup()
    c1=physics.body(CIRCLE,20)
    c1.x=WIDTH/2
    c1.y=HEIGHT/4
    c1.type=STATIC
    c2=physics.body(CIRCLE,20)
    c2.x=WIDTH/2
    c2.y=HEIGHT/1.5
    c2.restitution=1
end

function draw()
    background(40, 40, 50)
    if change then
        sprite("Planet Cute:Character Boy",c1.x,c1.y)
        sprite("Planet Cute:Character Pink Girl",c2.x,c2.y)
    else
        sprite("Planet Cute:Character Pink Girl",c1.x,c1.y)
        sprite("Planet Cute:Character Boy",c2.x,c2.y)
    end    
end

function collide(c)
    if c.state==BEGAN then
        change=not change
    end
end
5

It made 2 massive ones of the second sprites, Do I have to redo it so I is all there

DTK I was asking for co to change my sprite if It is hit,
We are making a Angry birds type game

6

Thanks guys

7

@RobinBundles Here’s something else. Without seeing your code, it’s hard to know exactly what you want or how to fix it.


supportedOrientations(LANDSCAPE_ANY)

function setup()
    hit = false
    c1=physics.body(CIRCLE,20)
    c1.x=WIDTH/2
    c1.y=HEIGHT/2
    c1.type=STATIC
    
    c2=physics.body(CIRCLE,20)
    c2.x=10
    c2.y=10
    c2.restitution=1
    c2.gravityScale=0
    c2.linearVelocity=vec2(200,225)
end

function draw()
    background(40, 40, 50)
    fill(255)
    ellipse(c2.x,c2.y,40)
    if hit then
        sprite("Planet Cute:Character Pink Girl",c1.x,c1.y)
    else
        sprite("Planet Cute:Character Boy",c1.x,c1.y)
    end    
end

function collide(c)
    if c.state==BEGAN then
        hit = true
    end
end
8

I made my own example, that uses its own class to handle everything, to make a heart that falls on a line, and darkens for 0.75 seconds when it is hit. It’s also well commented and explains pretty much everything.


-- Collision Animation

-- Use this function to perform your initial setup
function setup()
    floor = physics.body(EDGE, vec2(0, 50), vec2(WIDTH, 0)) -- Create the floor
    c = Char(WIDTH / 4, HEIGHT / 2) -- Create the character
end

-- This function gets called once every frame
function draw()
    -- This sets a light background color 
    background(255)

    -- This sets the line thickness
    strokeWidth(5)

    -- Do your drawing here
    stroke(0) -- Dark stroke
    line(0, 50, WIDTH, 0) -- Draw the floor
    c:draw() -- Let the character handle its drawing
end

function collide(contact)
    c:collide(contact) -- Let the character handle its own collisions
end

Char = class() -- Create the character's class

function Char:init(x, y)
    self.obj = physics.body(CIRCLE, 50) -- Create and configure a physics body
    self.obj.x = x
    self.obj.y = y
    self.obj.restitution = 0.5
    self.hurtTimer = 0 -- Hurt timer
end

function Char:draw()
    self.hurtTimer = math.max(0, self.hurtTimer - DeltaTime) -- Lowers the hurt timer, math.max ensures it's greater than or equal to 0, and self.hurtTime - DeltaTime means that no matter how long it took to draw the frame, it always lowers it the samd amount.
    pushMatrix() -- Push the matrix
    translate(self.obj.x, self.obj.y) -- Translate drawing to the physics body's position, so rotating doesn't glitch
    rotate(self.obj.angle) -- Rotate to the body's angle
    if self.hurtTimer > 0 then -- Is the character hurt?
        sprite("Small World:Heart Dark", 0, 0, 100) -- Darken the heart
    else -- Not hurt
        sprite("Small World:Heart Flat", 0, 0, 100) -- Lighten the heart
    end
    popMatrix() -- Pop the matrix
end

function Char:collide(contact)
    if contact.bodyA == self.obj or contact.bodyB == self.obj and contact.state == BEGAN then -- Is at least one of the affected bodies the character, and is the contact just starting?
        self.hurtTimer = 0.75 -- Set the hurt timer to 0.75 seconds, configurable
    end
end
9

That seems to have worked

10

My entire update function has gone Kaput when I put Sky’s code in. Why?

11

Try copying the “Char” class to a separate part of your code, maybe another tab, and try to use it then, like in the code. And don’t forget to edit function collide(contact) or it won’t change.

Also, can you try to better describe what happens when you used my code or share it, maybe?