question: @ SideOnly ( Side . CLIENT ) public static int renderTooltip ( int x , int y , List < String > tooltipData , int color , int color2 ) { boolean lighting = GL11 . glGetBoolean ( GL11 . GL_LIGHTING ) ; if ( lighting ) RenderHelper . disableStandardItemLighting ( ) ; if ( ! tooltipData . isEmpty ( ) ) { int var5 = 0 ; int var6 ; int var7 ; FontRenderer fontRenderer = Minecraft . getMinecraft ( ) . fontRendererObj ; for ( var6 = 0 ; var6 < tooltipData . size ( ) ; ++ var6 ) { var7 = fontRenderer . getStringWidth ( tooltipData . get ( var6 ) ) ; if ( var7 > var5 ) var5 = var7 ; } var6 = x + 12 ; var7 = y - 12 ; int var9 = 8 ; if ( tooltipData . size ( ) > 1 ) var9 += 2 + ( tooltipData . size ( ) - 1 ) * 10 ; float z = 300F ; drawGradientRect ( var6 - 3 , var7 - 4 , z , var6 + var5 + 3 , var7 - 3 , color2 , color2 ) ; drawGradientRect ( var6 - 3 , var7 + var9 + 3 , z , var6 + var5 + 3 , var7 + var9 + 4 , color2 , color2 ) ; drawGradientRect ( var6 - 3 , var7 - 3 , z , var6 + var5 + 3 , var7 + var9 + 3 , color2 , color2 ) ; drawGradientRect ( var6 - 4 , var7 - 3 , z , var6 - 3 , var7 + var9 + 3 , color2 , color2 ) ; drawGradientRect ( var6 + var5 + 3 , var7 - 3 , z , var6 + var5 + 4 , var7 + var9 + 3 , color2 , color2 ) ; int var12 = ( color & 0xFFFFFF ) > > 1 | color & - 16777216 ; drawGradientRect ( var6 - 3 , var7 - 3 + 1 , z , var6 - 3 + 1 , var7 + var9 + 3 - 1 , color , var12 ) ; drawGradientRect ( var6 + var5 + 2 , var7 - 3 + 1 , z , var6 + var5 + 3 , var7 + var9 + 3 - 1 , color , var12 ) ; drawGradientRect ( var6 - 3 , var7 - 3 , z , var6 + var5 + 3 , var7 - 3 + 1 , color , color ) ; drawGradientRect ( var6 - 3 , var7 + var9 + 2 , z , var6 + var5 + 3 , var7 + var9 + 3 , var12 , var12 ) ; GlStateManager . disableDepth ( ) ; for ( int var13 = 0 ; var13 < tooltipData . size ( ) ; ++ var13 ) { String var14 = tooltipData . get ( var13 ) ; fontRenderer . drawStringWithShadow ( var14 , var6 , var7 , - 1 ) ; if ( var13 == 0 ) var7 += 2 ; var7 += 10 ; } GlStateManager . enableDepth ( ) ; return var7 + 12 ; } if ( ! lighting ) RenderHelper . disableStandardItemLighting ( ) ; GlStateManager . color ( 1F , 1F , 1F , 1F ) ; return 0 ; }
target:  Renders a tooltip at the cursor