sprite boundary? - GameCreators Forum

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TheComet

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Posted: 6th Aug 2010 22:05

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Is there a way to set an area on the screen where a specific sprite is drawn, and if that sprite leaves that area, it's cut off?

Thanks,

TheComet

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Mugen Wizardry

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Posted: 6th Aug 2010 22:26

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if u mean it leaves the area and its supposed to stop, then:

screen width()-sprite width(img)

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TheComet

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Posted: 6th Aug 2010 22:33

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Not exactly, the part of the sprite that is out of the area should not be drawn, but the part of the sprite in the area should still be drawn... More like one of the layers on gimp.

TheComet

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Indicium

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Posted: 6th Aug 2010 22:40

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I think you'd have to load it into a memblock and edit it :/

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Grog Grueslayer

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Posted: 6th Aug 2010 23:15 Edited at: 6th Aug 2010 23:29

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You could always create a border sprite so all other sprites are under it. It won't cut up the sprite but it just won't be seen because the border sprite is on top.

In the following code snip I use image number 1000 for the border to guarantee the sprite it uses will be on top of any sprites that use image numbers 1 to 999.

+ Code Snippet

` Screen setup
set display mode 800,600,32
sync rate 0
sync on

` Grab the background as it is
get image 1,0,0,800,600

` Make a border image
ink rgb(5,5,5),0
box 0,0,800,600
ink 0,0
box 100,100,700,500
get image 1000,0,0,800,600

` Make a small box
ink rgb(0,255,0),0
box 0,0,30,30
get image 2,0,0,30,30,1

do

 ` Paste the background
 paste image 1,0,0
 ` Show the border sprite
 sprite 1,0,0,1000
 ` Show the small box at the mouse coordinates
 sprite 2,mousex(),mousey(),2
 sync

loop

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Sasuke

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Posted: 7th Aug 2010 00:53 Edited at: 7th Aug 2010 00:53

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The best way would be to alter the sprite texture coords/size. Here's an example sort of ported from my macro gui:

type SpriteViewport
    left as integer
    top as integer
    right as integer
    bottom as integer
endtype

type Sprt
    posX as integer
    posY as integer
    sizeX as float
    sizeY as float
endtype

global gSpriteViewport as SpriteViewport

gSpriteViewport.left = 192
gSpriteViewport.top = 128
gSpriteViewport.right = gSpriteViewport.left+512
gSpriteViewport.bottom = gSpriteViewport.top+368

global gSprite as Sprt

gSprite.posX = 256
gSprite.posY = 256
gSprite.sizeX = 128
gSprite.sizeY = 92

global gSpriteDrag as byte
global gDragX as integer
global gDragY as integer

sync on : sync rate 60
color backdrop 0

cls rgb(255,255,255)
    ink rgb(0,128,192),0
    box 2,2,gSprite.sizeX-2,gSprite.sizeY-2
    ink 0,0
    text 6,6,"HELLO EVERYONE"
    get image 1,0,0,gSprite.sizeX,gSprite.sizeY,1
    sprite 1,gSprite.posX,gSprite.posY,1
cls

do

// drag sprite

if mouseclick() = 0
        gSpriteDrag = 0
        gDragX = 0
        gDragY = 0    
    endif

if mouseclick() and gSpriteDrag = 0
        gSpriteDrag = 1
        gDragX = mousex() - gSprite.posX
        gDragY = mousey() - gSprite.posY
    endif
    
    if gSpriteDrag
        gSprite.posX = mousex() - gDragX
        gSprite.posY = mousey() - gDragY
    endif

// set sprite corrds to fit only within boundaries

offsetLeft = 0
    offsetTop = 0
    offsetRight = 0
    offsetBottom = 0
    offsetSizeX = 0
    offsetSizeY = 0

if gSprite.posX < gSpriteViewport.left then offsetLeft = gSpriteViewport.left - gSprite.posX
    if (gSprite.posX+gSprite.sizeX) > gSpriteViewport.right then offsetRight = (gSprite.posX+gSprite.sizeX) - gSpriteViewport.right
    if gSprite.posY < gSpriteViewport.top then offsetTop = gSpriteViewport.top - gSprite.posY
    if (gSprite.posY+gSprite.sizeY) > gSpriteViewport.bottom then offsetBottom = (gSprite.posY+gSprite.sizeY) - gSpriteViewport.bottom
    
    offsetSizeX = gSprite.sizeX - (offsetLeft+offsetRight)
    offsetSizeY = gSprite.sizeY - (offsetTop+offsetBottom)
    
    if offsetSizeX > 0 and offsetSizeY > 0
        u0# = offsetLeft / gSprite.sizeX
        u1# = offsetSizeX / gSprite.sizeX
        v0# = offsetTop / gSprite.sizeY
        v1# = offsetSizeY / gSprite.sizeY
        sprite 1,gSprite.posX+offsetLeft,gSprite.posY+offsetTop,1
        set sprite texture coord 1,0,u0#    ,v0#
        set sprite texture coord 1,1,u0#+u1#,v0#
        set sprite texture coord 1,2,u0#    ,v0#+v1#
        set sprite texture coord 1,3,u0#+u1#,v0#+v1#
        size sprite 1,offsetSizeX,offsetSizeY
        show sprite 1
    else
        hide sprite 1
    endif

// draw sprite shadow
    ink rgb(52,52,52),0
        box gSprite.posX,gSprite.posY,gSprite.posX+offsetSizeX+offsetRight+offsetLeft,gSprite.posY+offsetSizeY+offsetBottom+offsetTop

// dtaw boundaries
    ink rgb(255,0,0),0
        box gSpriteViewport.left-2,gSpriteViewport.top-2,gSpriteViewport.right+2,gSpriteViewport.bottom+2
    ink rgb(32,32,32),0
        box gSpriteViewport.left,gSpriteViewport.top,gSpriteViewport.right,gSpriteViewport.bottom
    ink rgb(255,255,255),0
    
    set cursor 0,0
    print "Hold Mouse to Move Sprite"
    print "[Sprite Coords]"    
    print "u0#: "+str$(u0#)
    print "u1#: "+str$(u1#)    
    print "v0#: "+str$(v0#)
    print "v1#: "+str$(v1#)
    
    sync
loop

+ Code Snippet

type SpriteViewport
    left as integer
    top as integer
    right as integer
    bottom as integer
endtype

type Sprt
    posX as integer
    posY as integer
    sizeX as float
    sizeY as float
endtype

global gSpriteViewport as SpriteViewport

gSpriteViewport.left = 192
gSpriteViewport.top = 128
gSpriteViewport.right = gSpriteViewport.left+512
gSpriteViewport.bottom = gSpriteViewport.top+368

global gSprite as Sprt

gSprite.posX = 256
gSprite.posY = 256
gSprite.sizeX = 128
gSprite.sizeY = 92

global gSpriteDrag as byte
global gDragX as integer
global gDragY as integer

sync on : sync rate 60
color backdrop 0

cls rgb(255,255,255)
    ink rgb(0,128,192),0
    box 2,2,gSprite.sizeX-2,gSprite.sizeY-2
    ink 0,0
    text 6,6,"HELLO EVERYONE"
    get image 1,0,0,gSprite.sizeX,gSprite.sizeY,1
    sprite 1,gSprite.posX,gSprite.posY,1
cls

do

    // drag sprite

    if mouseclick() = 0
        gSpriteDrag = 0
        gDragX = 0
        gDragY = 0    
    endif

    if mouseclick() and gSpriteDrag = 0
        gSpriteDrag = 1
        gDragX = mousex() - gSprite.posX
        gDragY = mousey() - gSprite.posY
    endif
    
    if gSpriteDrag
        gSprite.posX = mousex() - gDragX
        gSprite.posY = mousey() - gDragY
    endif

    // set sprite corrds to fit only within boundaries

    offsetLeft = 0
    offsetTop = 0
    offsetRight = 0
    offsetBottom = 0
    offsetSizeX = 0
    offsetSizeY = 0

    if gSprite.posX < gSpriteViewport.left then offsetLeft = gSpriteViewport.left - gSprite.posX
    if (gSprite.posX+gSprite.sizeX) > gSpriteViewport.right then offsetRight = (gSprite.posX+gSprite.sizeX) - gSpriteViewport.right
    if gSprite.posY < gSpriteViewport.top then offsetTop = gSpriteViewport.top - gSprite.posY
    if (gSprite.posY+gSprite.sizeY) > gSpriteViewport.bottom then offsetBottom = (gSprite.posY+gSprite.sizeY) - gSpriteViewport.bottom
    
    offsetSizeX = gSprite.sizeX - (offsetLeft+offsetRight)
    offsetSizeY = gSprite.sizeY - (offsetTop+offsetBottom)
    
    if offsetSizeX > 0 and offsetSizeY > 0
        u0# = offsetLeft / gSprite.sizeX
        u1# = offsetSizeX / gSprite.sizeX
        v0# = offsetTop / gSprite.sizeY
        v1# = offsetSizeY / gSprite.sizeY
        sprite 1,gSprite.posX+offsetLeft,gSprite.posY+offsetTop,1
        set sprite texture coord 1,0,u0#    ,v0#
        set sprite texture coord 1,1,u0#+u1#,v0#
        set sprite texture coord 1,2,u0#    ,v0#+v1#
        set sprite texture coord 1,3,u0#+u1#,v0#+v1#
        size sprite 1,offsetSizeX,offsetSizeY
        show sprite 1
    else
        hide sprite 1
    endif

    // draw sprite shadow
    ink rgb(52,52,52),0
        box gSprite.posX,gSprite.posY,gSprite.posX+offsetSizeX+offsetRight+offsetLeft,gSprite.posY+offsetSizeY+offsetBottom+offsetTop

    // dtaw boundaries
    ink rgb(255,0,0),0
        box gSpriteViewport.left-2,gSpriteViewport.top-2,gSpriteViewport.right+2,gSpriteViewport.bottom+2
    ink rgb(32,32,32),0
        box gSpriteViewport.left,gSpriteViewport.top,gSpriteViewport.right,gSpriteViewport.bottom
    ink rgb(255,255,255),0
    
    set cursor 0,0
    print "Hold Mouse to Move Sprite"
    print "[Sprite Coords]"    
    print "u0#: "+str$(u0#)
    print "u1#: "+str$(u1#)    
    print "v0#: "+str$(v0#)
    print "v1#: "+str$(v1#)
    
    sync
loop

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Rich Dersheimer

AGK Developer

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Posted: 7th Aug 2010 04:58

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IanM's matrix1 utilities has a command

SET SPRITE VIEW

that let's you define a window where sprites appear. That might work for you.

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Madscientist

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Location: Between a rock and a hard place

Posted: 7th Aug 2010 05:33 Edited at: 7th Aug 2010 05:34

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I found like Sasuke said use Set Sprite Texture Coord
The vertex mode is 0-3 and goes like this

+ Code Snippet

0 ___ 1
 |   |
 |___|
2     3

Then the next two values are the U and V positions in percentages of the sprite image from 0.0 to 1.0.
So vertex 0 is (0,0).
Vertex 1 (1,0).
Vertex 2 (0,1)
Vertex 3 (1,1)

Then after you change those around, to your liking,
use stretch sprite for the percentage of your vertex positions.
Example:

+ Code Snippet

set sprite texture coord MySprite,2,0,0.08
set sprite texture coord MySprite,3,1,0.08
stretch sprite MySprite,100,8

Here I cut off all of the sprite except for 0.08 (8%) of the top.
Then I stretched that sprite 8% in the Y direction so no streching will occur.

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The memory is enormous. My computer is unique to everyone else’s. What computer do I have?

+ Code Snippet