Touches

Questions
1

I’m wondering how I could detect touches without using a ton of condtional code. Could sombody help ;:wink: ? Thanks .

2

To do what? It depends on what you need.

3

I don’t know, for example when you tap a circle the screen turns red. The only way i know to do this is

-- Circle

-- Use this function to perform your initial setup
function setup()
    print("Hello World!")
end

-- This function gets called once every frame
function draw()
    -- This sets a dark background color 
    background(40, 40, 50)

    -- This sets the line thickness
    strokeWidth(5)

    -- Do your drawing here
    ellipse(WIDTH/2,HEIGHT/2,200)
    
end
function touched(touch)
    if touch.state == ENDED and touch.x< --blah blah

end

@Ignatz

4

that looks fine to me. You seem to need those conditions in the touch function. What is the problem?

5

I’m justt wondering if there is an easier way to detect touches than to take 10 lines to test for each touch.
@Ignatz

6

where are the 10 lines?

7

if the position of your ellipse is at e=vec2(WIDTH/2,HEIGHT/2), with diameter eWidth=200, and the colour of your ellipse is stored in colr, then you can write

if touch.state==ENDED and e:dist(vec2(touch.x,touch.y))<eWidth/2 then 
    colr=color(255,0,0) --change ellipse colour to red
end
8

@infiltration265 Here’s something I had, maybe this will help.

supportedOrientations(PORTRAIT)
displayMode(FULLSCREEN)

function setup()
    count=50   
    circ={}  -- table for x,y coordinates
    colr={}  -- table for color  
    for x=1,count do
        circ[x]=vec2(math.random(50,WIDTH-50),math.random(50,HEIGHT-50))
        colr[x]=vec3(255,255,255)
    end
end

function draw()
    background(40, 40, 50)    
    x=CurrentTouch.x    -- touched x value
    y=CurrentTouch.y    -- touched y value     
    for x1=1,count do
        xc=circ[x1].x  -- get x,y coordinates
        yc=circ[x1].y        
        c=colr[x1]  -- get color
        c=fill(color(c.x,c.y,c.z))
        ellipse(xc,yc,50,50)        
        -- check if object is touched
        if (y-yc)^2/20^2+(x-xc)^2/20^2 <= 1 then
            colr[x1]=vec3(255,0,0)  -- change color to red
        end  
    end
end
9

@Ignatz Thanks!!! It worked perfectly. I thought the only way to detect a touch on a certain object was to do something like

if touch.state == ENDED and touch.y > ellipse1y-ellipsesizeh/2 and touch.y < ellipse1y+ellipsesizeh and touch.x > ellipsex-ellipsesizew/2 and touch.x < ellipsex+ellipsesizew/2 then
10

@infiltration265 If you’re checking for a box, you can also do:

if math.abs(touch.x - rectx) <= rectwidth / 2 and math.abs(touch.y - recty) <= rectheight / 2 then
11

@infiltration265 - check out the other vec functions in the built in docs, too. There are some useful things there.