Right now what I am trying to do is in my mod I have an element that gets rendered into the world and onto a Gui, instead of specifying the color of it, I would like to color it based on rgb values entered with a slider. right now I have the sliders working but it doesn't give the correct color.

 

This is the code:

 

 

public int red;

public int green;

public int blue;

 

public Point(int red, int green, int blue)

{

this.red = red;

this.green = green;

this.blue = blue;

}

 

// Renders the element into the world

public void drawIconInWorld(WorldRenderer worldrenderer, Tessellator tessellator)

{

int i = this.red >> 16 & 255;

int i1 = this.green >> 8 & 255;

int i2 = this.blue & 255;

 

GlStateManager.disableTexture2D();

worldrenderer.startDrawingQuads();

worldrenderer.setColorRGBA(i, i1, i2, 120);

worldrenderer.addVertex(-5.0D, -9.0D, 0.0D);

worldrenderer.addVertex(-5.0D, 0.0D, 0.0D);

worldrenderer.addVertex(4.0D, 0.0D, 0.0D);

worldrenderer.addVertex(4.0D, -9.0D, 0.0D);

tessellator.draw();

GlStateManager.enableTexture2D();

}

 

// Renders the element onto the GUI

public void drawIconOnGui(int drawX, int drawY)

{

int rectX2 = drawX + 9;

int rectY2 = drawY + 9;

Gui.drawRect(drawX, drawY, rectX2, rectY2, this.red >> 16 & 255 | this.green >> 8 & 255 | this.blue & 255);

}

 

 

honestly I think that was me testing and not realizing I don't exactly have to do those, but still not 100% sure about the gui

I have changed it to Gui.drawRect(drawX, drawY, rectX2, rectY2, (this.red << 16 & 255 | this.green << 8 & 255 | this.blue & 255)); and now it just doesn't appear to draw the rectangle.

Or more accurately, because of math, it's 0 (you start with 0 and start adding things together, and none of the values added end up in the set of bits used by alpha, so its 0).

 

Also, drop the & 255 bit.  That's setting all of your color values to 0.

 

red = 128; //red is 128
red = red << 16; //red is 8388608
red = red & 255; //red is 0
/*
  100000000000000000000000
&                 11111111
==========================
  000000000000000000000000
*/

I'm not exactly great with the colors, how would I add the alpha value to the: this.red << 16 | this.green << 8 | this.blue

Complete the next item in the series:  0, 8, 16...

 

 

24.

 

this.alpha << 24

 

alright its working, thanks.

 

Edit: actually noticing this, but when I change the blue value it changes the alpha...

Then the color might be oriented in RGBA instead of ARGB

tried

int color = (this.red << 16 | this.green << 8 | this.blue);

Gui.drawRect(drawX, drawY, rectX2, rectY2, color << 24 | color);

and

int color = (this.red << 16 | this.green << 8 | this.blue);

Gui.drawRect(drawX, drawY, rectX2, rectY2, color | color << 24);

but it made no difference.

tried

int color = (this.red << 16 | this.green << 8 | this.blue);

Gui.drawRect(drawX, drawY, rectX2, rectY2, color << 24 | color);

and

int color = (this.red << 16 | this.green << 8 | this.blue);

Gui.drawRect(drawX, drawY, rectX2, rectY2, color | color << 24);

but it made no difference.

Holy smokes dude!

 

If the bit shifting is causing you that much grief, perhaps try this class instead-

Java.awt.Color

 

Color myColour = new Color(red, green, blue);

Gui.drawRect(drawX, drawY, rectX2, rectY2, myColour.getRGB());

 

-TGG

 

 

 

*facepalm*

I'm not exactly great with the colors, how would I add the alpha value to the: this.red << 16 | this.green << 8 | this.blue

You do the same as with red, green and blue, with an alpha value of 255, and bitshifted 24 to the left.