Flickering problem in sprite animation

Programming Questions

g1i1ch

Flickering problem in sprite animation

in Programming Questions • 9 months ago

I'm just drawing a simple sprite on the screen. It seems to be flickering on and off. Not sure what to do about it... I've tried double buffering and not, it happens on both. Even though I've heard double buffering is already provided. I'm also getting a decent framerate... Well here's my code if anyone has any ideas.

Copy code

Sprite box;
PGraphics screen;
void initScreen(){
size(800, 450);
frameRate(30);
rectMode(CENTER);
screen = createGraphics(800, 450);
smooth();
noStroke();
fill(255);
}
void setup() {
initScreen();
box = new Sprite("spritesheet.png", 300/5, 360/6);
};
void draw() {
screen.beginDraw();
screen.background(#999999);
screen.text(frameRate, width-50, 15);
box._draw();
screen.endDraw();
image(screen, 0, 0);
}
class Sprite {
private PImage img;
private int x = 0;
private int y = 0;
private int w;//sprite width
private int h;//sprite height
Sprite(String img_path, int wc, int hc){
img = loadImage(img_path);
w = wc;
h = hc;
}
void _draw(){
screen.image(img.get(x*w, y*h, w, h), 100, 100);
//move ahead a frame
x += 1;
//see if we should move down a row
if(x*w > img.width){
x = 0;
//see if we should go back to the beginning
if(y*h >= img.height){
y = 0;
} else {
y += 1;
}
}
}
}

If anyone can help, thanks a lot!

Replies(3)

g1i1ch

Re: Flickering problem in sprite animation

9 months ago

Okay I figured that out. Turns out PImage.get is a LOT slower than I expected! So now here's a new Sprite class I made that caches the individual frames. It's much simpler anyways.

Copy code

class Sprite {
private PImage img;
private int frame = 0;
private int length = 0;
PImage[] cache;
Sprite(String img_path, int w, int h){
img = loadImage(img_path);
int xcount = img.width/w;
length = xcount*(img.height/h);
cache = new PImage[length];
for(int i = 0; i < length; i++){
int xc = i%xcount;
int yc = floor(i/xcount);
cache[i] = img.get(xc*w, yc*h, w, h);
}
}
void _draw(){
screen.image(cache[frame], 100, 100);
//move ahead a frame
frame += 1;
//see if we should restart
if(frame >= length)
frame = 0;
}
}

quarks

Re: Flickering problem in sprite animation

9 months ago

If you are planning on developing software that uses sprites can I suggest you look at the Sprite for Processing library

g1i1ch

Re: Flickering problem in sprite animation

9 months ago

If you are planning on developing software that uses sprites can I suggest you look at the Sprite for Processing library

Thanks I checked it out, but I don't think it matches my needs. I like to separate between my resources and actors. Helps when you have to manage hundreds of each. Nice work though!

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