'SetSpriteColor' not working for me...

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Men_of_Fun

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Posted: 24th Nov 2017 20:46 Edited at: 24th Nov 2017 20:49

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This example is very baffling to me:

It's just a very simple command, and I don't know why it's not working....
I load a red sprite image called 'red_ball,png'
I make a sprite out of it (a red sprite)
then later on I want to change the color to yellow, and it simply does not work..

Here is the code I use:

LoadImage(100,"red_ball.png")
CreateSprite(100,100)
SetSpritePosition(100,50,50)
setspritecolor(100,255,255,0,255) // on this line I try to make it turn yellow, but it doesn't

I can make it turn transparent using setspritecolor(100,255,255,0,0), but that's all I've been able to do.

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janbo

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Location: Germany

Posted: 24th Nov 2017 21:40 Edited at: 24th Nov 2017 21:42

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Hi Men_of_Fun,
Try it with a completely white ball.
Maybe it doesn't turn Yellow because you can't multiply the Red which is Red(255),Green(0) and Blue(0) with Yellow which is Red(255), Green(255) and Blue(0) ...Red would be completely Red already and Green times zero is still zero.

So:
255,255,0 * 255,0,0 = 255,0,0
Red * Yellow = Red

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BatVink

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Location: Gods own County, UK

Posted: 26th Nov 2017 08:49

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To add to what Janbo has already said, you can use greyscale images with setSpriteColor.
White is affected 100%.
Black is affected 0%
Everything in between is affected proportionally
In your example, you could then set your white ball (With greyscale shading if required) to red, yellow, or any other colour.

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Dybing

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Location: Bergen, Norway

Posted: 26th Nov 2017 11:16 Edited at: 26th Nov 2017 11:18

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Think of it this way - each color channel provides a range from 0 to a max value that setspritecolor() can work within.

So a sprite that is your basic red blob, will have a max values of 255, 0 , 0. So full range on red, no range on green or blue. So to have a sprite setspritecolor() can change to any arbitrary color, it need be full white - 255, 255, 255 - and if you want details in that sprite, you use shades of grey to paint them in. If you want to keep any color detail, you need to layer two (or more) sprites on top of each other, and just use setspritecolor() on one of the layers.

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puzzler2018

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Posted: 26th Nov 2017 11:25

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Or if it is just a red blob an nothing else, then can use the DrawEllipse command to create a white blob , create a sprite using getimage/render/update ccommands to create a sprite
and then color that

Doing this, will create a white blob with all the red/green/blue/alpha to be able to use

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puzzler2018

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Posted: 26th Nov 2017 11:31

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+ Code Snippet


// Project: balls 
// Created: 2017-11-26

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "balls" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts


Render()
DrawEllipse(10,10,10,10,MakeColor(255,255,255),MakeColor(255,255,255),1)
Swap()

ballimg = GetImage(0,0,20,20)
ballspr = createsprite(ballimg)

do
	SetSpritePosition(ballspr,getpointerx(),getpointery())
	
// change this to what you like
	SetSpriteColor(ballspr,255,255,0,255)
    

    Print( ScreenFPS() )
    Sync()
loop

D

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