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Creating a progress bar on a GUI?


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I'm trying to make a GUI for my electric generator and I want it to show a bar which displays how much power the generator is holding. After playing around for quite some time trying to get it to work, the progress bar shows as full permanently until you get to about 80% full, when the power bar starts to drain.


Gui code:

public void drawGuiContainerBackgroundLayer(float var1, int var2, int var3) 
	drawTexturedModalRect(guiLeft, guiTop, 0, 0, xSize, ySize); //Main gui

	int i = (int) this.windTurbine.getPowerScaled(162);
	drawTexturedModalRect(guiLeft+7, guiTop+10, 0, 167, guiLeft+169-i, guiTop+25); //Power bar



public int getPowerScaled(int scaled)
	return (int) (buffer().getEnergy() * scaled / buffer().getEnergyCapacity());


Rather crude unfinished GUI



Any help is greatly appricated. If you need to see any more code, I will upload it.

I have no idea what I'm doing.

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