An array is a container that holds a fixed number of values, a bit like a spreadsheet table. With arrays we can store multiple variables of the same type, and access them easily.
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Unlike arrays, ArrayLists can only be one dimension.
Exercise 8.2
Use an array or arraylist to draw animated icons on the screen.
| Code Block | ||||||
|---|---|---|---|---|---|---|
| ||||||
int noOfPuffs = 60;
int[] puffsX = new int[noOfPuffs];
int[] puffsY = new int[noOfPuffs];
int puffSize= 40;
int scaleDirection = 1;
int currentPuff= 0;
void setup() {
size(600,600);
noStroke();
}
void draw() {
background(0);
for(int i = 0; i < puffsX.length; i++) {
puffs(puffsX[i],puffsY[i]);
}
puffSize+=scaleDirection;
if (puffSize>70 || puffSize<20) {
scaleDirection = -scaleDirection;
}
}
void puffs(int x, int y) {
fill(255);
ellipse(x,y,puffSize,puffSize);
};
void mouseMoved(){
currentPuff++;
if (currentPuff >= noOfPuffs) {
currentPuff = 0;
}
puffsX[currentPuff] = mouseX;
puffsY[currentPuff] = mouseY;
}; |
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