Mouse Scrolling
Mouse scrolling is a form of scrolling, but can be simpler due to there being less code required than regular scrolling.
Mouse Scrolling Engine
Setting Up
To set up the project with the ability to scroll using only a mouse pointer, two sprites, and four variables are needed. The four variables required are the following:
(x)(y)(pos x)(pos y)
After creating these variables, the two sprites need to be created. The map and the character. The map can be made of any size. If the map sprite cannot get very large, please refer to this to learn how to bypass the size limit.
Coding
Coding the Map
For coding the map of the project, the following code is needed:
define update map set [pos x v] to (((x) - ((x) * [2])) / (10) set [pos y v] to (((y) - ((y) * [2])) / (10) when green flag clicked forever update map go to x: (pos x) y: (pos y)
Coding the Player
The scripts are as shown:
when green flag clicked set [x v] to (0) set [y v] to (0) forever movement//defined later end define movement point towards (mouse-pointer v) change [x v] by ((mouse x)/ (3) change [y v] by ((mouse y)/ (3)
Adding Objects To Scrolling Games
Sometimes in a scrolling game, interactive objects are added. The go to x: () y: () block can be used but the object(s) will just stay right on the screen. Here are a couple different methods on how to put objects in a set location on a scrolling game:
A Singular Object
In order to have a single object stay in place on a scrolling game, a certain code is needed to that the object will not stick to a set location on the screen. First, only 2 local variables are needed:
(x)(y)
Once you have those required variables, all you need to do now is give the object the code that will make it stay in one location (not on the screen) and will give it the ability to go on and off the screen:
when green flag clicked forever go to x:((x) - (pos x)) y:((y) - (pos y)) if <<((x) - (pos x)) = (x position)> and<((y) - (pos y)) = (y position)>> then show else hide end ...//anything else can go here or just start another line of code somewhere else end
Cloning The Same Object
The other way to add multiple objects to a project is by cloning them. For this sprite, the x and y variable are needed.
A custom block is the preferred method for cloning the sprite to prevent errors in the coding:
define clone at (x) (y)//run without screen refresh set [x v] to (x) set [y v] to (y) create clone of (myself v) when green flag clicked clone at () ()//change these two labels to the clone coordinates
Then for the positioning for the clones objects, it is the same thing as the singular object except replace the when gf clicked with when I start as a clone hat block:
when I start as a clone forever go to x:((x) - (pos x)) y:((y) - (pos y)) if <<((x) - (pos x)) = (x position)> and<((y) - (pos y)) = (y position)>> then show else hide end ...//anything else can go here or just start another line of code somewhere else end
