Varying PowerBar!

PowerBar class codes .. so far?

import greenfoot.*; public class PowerBar extends Actor { public void act() { GreenfootImage image = new GreenfootImage(50, 500); image.setColor(Color.WHITE); image.fill(); setImage(image); } //https://www.greenfoot.org/topics/379 }

import greenfoot.*; public class Boss1 extends World { Reka r = new Reka(); Hero h = new Hero(); Pie p = new Pie(); PowerBar pb = new PowerBar(); public Boss1() { super(1000,540, 1); addObject(r, 500,50); addObject(h, 500,500); addObject(p, 475,50); addObject(pb, 950,270); } }

Your power bar needs a value for how full it is. Then, you can color the correct portion of the bar depending on that value.

You can draw on any rectangular portion of the image or draw a separate image on it at any given location.

okay so I've tried something... and it's giving an error... Hero class: import greenfoot.*; public class Hero extends Actor { GreenfootSound booSound = new GreenfootSound("Boo.wav"); int powerAdd = 0; public void act() { checkKeys(); } public void checkKeys() { int x = getX(); if (Greenfoot.isKeyDown("space")) { booSound.play(); powerAdd++; PowerBar p = new PowerBar(); p.PowerBar(powerAdd); } if (Greenfoot.isKeyDown("left")) x=x-3; if (Greenfoot.isKeyDown("right")) x=x+3; setLocation(x,getY()); } } World Class: import greenfoot.*; public class Boss1 extends World { Reka r = new Reka(); Hero h = new Hero(); Pie p = new Pie(); PowerBar pb = new PowerBar(); public Boss1() { super(1000,540, 1); addObject(r, 500,50); addObject(h, 500,500); addObject(p, 475,50); addObject(pb, 950,270); } } PowerBar class: import greenfoot.*; public class PowerBar extends Actor {//https://www.youtube.com/embed/oJHP18bhLT0?autoplay=1 int powerAdd; public PowerBar(int powerAdd){ this.powerAdd = powerAdd; } int power = 0; int powerBarWidth = 50; int powerBarHeight = 500; int pixelsPerPowerPoint = (int)powerBarHeight/power; public void act() { GreenfootImage image = new GreenfootImage(powerBarWidth, powerBarHeight); image.setColor(Color.WHITE); image.fill(); setImage(image); image.drawRect(0,0,powerBarWidth,powerAdd); } //https://www.greenfoot.org/topics/379 }

You won't get anywhere drawing white on white. Another thing is that you have two powerAdd fields (not usually a good idea to have more than one field containing a specific value). Also, there is no need to create a new image every act step. And, you do not really need the fields for height and width. Use a constructor to create a base image and a bar image. Then you can use a combination of fill and drawImage to update the image. I am a bit confused. You are creating a PowerBar object in your Boss1 world. Then, you have your Hero object create another one each time the space is pressed -- and these are never added into the world (nor are the previous ones removed).

yea I can see the confusion... I realised I wasn't really done and didn't understand really much from the tutorial video I was watching. To be honest, I was thinking of like passing the "powerAdd" like a score system to a constructor, like using OOP. I will retry and check in if I run into any problems.