i have a standart bar in minecraft

 

 

int expbar = (int) (((double) 194) * (rins.getCURRENTLEVELEXP()) / rins.getNEXTLEVELMAXEXP());

            GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);

drawTexturedModalRect(xPos -94, yPos - 32 + 3, 0, 9, expbar, 7);

 

 

this is going normal like the normal expbar of minecraft.

 

But how i can change the drawing from right to left    to left to right?

1. calculate the size of the gui to draw

2. calculate the x where u want to start to draw (xmax-size)

3. draw the gui!

can i draw  rect with minus widht and hight?

 

sorry my english is not so good...

I cant find a way to solve this problem.

 

here is my bar

 

 

http://redsun.do.am/2016-01-31_01.33.18.png

 

 

the 2 bars on top are render the same, but i want the left bar to render right to left.

 

can write so good english i hope you understand it.

You should really learn tesselator (and math?) to understand the drawing process.

 

The method you are using now:

drawTexturedModalRect(xPos -94, yPos - 32 + 3, 0, 9, expbar, 7);

Is pretty much: Draw box from x/y, with width/height.

 

So logically, when width is your progress, the "walls" of box are at:

left: x

right: x+progress

top: y

bot: y+height

 

To draw in reverse you would need to have:

left: x+max-progress

right: x+max

top: y

bot: y+height

 

Converted to drawing:

drawTexturedModalRect(xPos + 194 - expbar, yPos - 29, 0, 9, expbar, 7);

 

But that is just plain stupid if you can easily learn tess and draw nice things, example:

	wr.addVertex(right, top, zLevel); // top right corner
	wr.addVertex(left, top, zLevel); // top left corner
	wr.addVertex(left, bottom, zLevel); // bot left
	wr.addVertex(right, bottom, zLevel); // bot right

This draws a box with said 4 corners. Since vertexes go anti-clockwise, you add them in this order. Look at "drawTexturedModalRect" on how to implement it, I leave it as an exerice.

Read more:

http://greyminecraftcoder.blogspot.com.au/2013/08/the-tessellator.html

thank you i think i understand it now, maybe i will draw it all with tessel now. i will try some stuff