From Test-Scratch-Wiki
This article is about how to make a scrolling platformer.
The process begins by creating a sprite. In this article it is called terrain0_0 for clarity.
when flag clicked forever go to x: ((ScrollX) + ((480) * (0))) y: ((ScrollY) + ((360) * (0))) end
This makes it so that the terrain scrolls. The two zeros in this situation correspond to the zeros in the sprite's name. For example, the sprite to the right of the center terrain is called terrain1_0 and it has
((scrollX)+((480)*(1)))
in the x space and
((scrollY)+((360)*(0)))
in the y space.
This can be repeated for the other terrain sprites. In general the terrain sprite that is x screens to the right of the center sprite and y screens above the center sprite is called terrainx_y in this example and has the following script:
when flag clicked forever go to x: ((ScrollX) + ((480) * (0))) y: ((ScrollY) + ((360) * (0))) end
It looks something like this when the sensor sprites are made to go to the player sprite. It can vary depending on the sprite shape.
It is the same code for every sensor sprite.
when flag clicked set [ghost v] effect to (100) forever go to [player v] if <touching color [#09FF5C]?> then // terrain color may vary set [hitTest v] to [1] else set [hitTest v] to [0] end end
The code in the picture below is then put into the player sprite.
when gf clicked set [scrollX v] to [0] set [scrollY v] to [0] set [yVelocity v] to [0] forever if <( [hitTest v] of [rightHitTest v] ) = [1]> then change [scrollX v] by (10) else if <key [right arrow v] pressed?> then change [scrollX v] by (-10) point in direction (90 v) end end if <( [hitTest v] of [LeftHitTest v] ) = [1]> then change [scrollX v] by (-10) else if <key [left arrow v] pressed?> then change [scrollX v] by (10) point in direction (-90 v) end end if <touching color [#09FF5C]?> then // terrain color may vary set [yVelocity v] to [1] if <key [up arrow v] pressed?> then set [yVelocity v] to [15] end end if <( [hitTest v] of [topHitTest v] ) = [1]> then set [yVelocity v] to [-3] change [scrollY v] by (3) end if <( [hitTest v] of [bottomHitTest v] ) = [1]> then change [scrollY v] by (-5) end change [yVelocity v] by (-1) change [scrollY v] by ((-1) * (yVelocity)) end
This results in a properly working scroller.
If the characters are intended to display animations when they move, the code in this project is added.
The final project looks something like this.
