Set the pointer on the bar. With the opacity value.

@param opacity float between 0 and 255
350763
public void setOpacity(int opacity) {
		mBarPointerPosition = Math.round((mOpacToPosFactor * opacity))
				+ mBarPointerHaloRadius;
		calculateColor(mBarPointerPosition);
		mBarPointerPaint.setColor(mColor);
		if (mPicker != null) {
			mPicker.setNewCenterColor(mColor);
		}
		invalidate();
	}
51736
public void setThresholdVisible(final boolean VISIBLE) {
        if (null == thresholdVisible) {
            _thresholdVisible = VISIBLE;
            fireUpdateEvent(VISIBILITY_EVENT);
        } else {
            thresholdVisible.set(VISIBLE);
        }
    }
1183693
@Override
  public void setStyleProperty(Element e, String prop, String val) {
    if ("opacity".equals(prop)) {
      setOpacity(e, val);
    } else {
      super.setStyleProperty(e, prop, val);
    }
  }
678523
public void setPointerAlpha(int alpha) {
        if (alpha >= 0 && alpha <= 255) {
            mPointerAlpha = alpha;
            mPointerHaloPaint.setAlpha(mPointerAlpha);
            invalidate();
        }
    }
1070391
public void setOverlayOpacity(int alpha) {

        if ((alpha >= 0) && (alpha <= 100) && isAttached()) {
            CmsTransparencyImpl.setTransparency(m_colorOverlay.getElement(), alpha);
        }
    }
996070
public void setValue(float value) {
		mBarPointerPosition = Math.round((mSVToPosFactor * (1 - value))
				+ mBarPointerHaloRadius + (mBarLength / 2));
		calculateColor(mBarPointerPosition);
		mBarPointerPaint.setColor(mColor);
		// Check whether the Saturation/Value bar is added to the ColorPicker
		// wheel
		if (mPicker != null) {
			mPicker.setNewCenterColor(mColor);
			mPicker.changeOpacityBarColor(mColor);
		}
		invalidate();
	}
24477
public void setCustomBarGraphColor(final Color COLOR) {
        getModel().setCustomValueColorObject(new CustomColorDef(COLOR));
        init(getInnerBounds().width, getInnerBounds().width);
        repaint(getInnerBounds());
    }
901367
public void setAverageVisible(final boolean VISIBLE) {
        if (null == averageVisible) {
            _averageVisible = VISIBLE;
            fireUpdateEvent(VISIBILITY_EVENT);
        } else {
            averageVisible.set(VISIBLE);
        }
    }
1288867
public void setPointer2Color(final ColorDef POINTER2_COLOR) {
        pointer2Color = POINTER2_COLOR;
        init(getInnerBounds().width, getInnerBounds().height);
        repaint(getInnerBounds());
    }
1079441
public void setSpecular(float gray){
        specular[0] = gray;
        specular[1] = gray;
        specular[2] = gray;
        Sp = true;
    }
1311105
function(opacity) { 
        if (opacity != undefined) {
            this.opacity = opacity; 
        }
        
        if (this.div != null) {
            // for Mozilla and Safari
            this.div.style.opacity = this.opacity;

            // for IE
            this.div.style.filter = 'alpha(opacity=' + this.opacity*100 + ')';
        }
    }
679272
public void setArrowColor(@ColorInt int color) {
    arrowColor = color;
    arrowColorDisabled = Utils.lighter(arrowColor, 0.8f);
    if (arrowDrawable != null) {
      arrowDrawable.setColorFilter(arrowColor, PorterDuff.Mode.SRC_IN);
    }
  }
433235
public void setIntColor(int x, int y, int alpha, int c0, int c1, int c2) {
        arrIntColor[((y * image.getWidth() + x))] = (alpha << 24) +
                (c0 << 16) +
                (c1 << 8) +
                c2;
    }
1114556
public void setValueVisible(final boolean VISIBLE) {
        if (null == valueVisible) {
            _valueVisible = VISIBLE;
            fireTileEvent(VISIBILITY_EVENT);
        } else {
            valueVisible.set(VISIBLE);
        }
    }
679600
public void setPointerShadowVisible(final boolean POINTER_SHADOW_VISIBLE) {
        getModel().setPointerShadowVisible(POINTER_SHADOW_VISIBLE);
        init(getInnerBounds().width, getInnerBounds().height);
        repaint(getInnerBounds());
    }
735290
public void setBarGraphColor(final ColorDef BARGRAPH_COLOR) {
        getModel().setValueColor(BARGRAPH_COLOR);
        init(getInnerBounds().width, getInnerBounds().width);
        repaint(getInnerBounds());
    }
366838
function set_opacity($opacity, $mode = "Normal") {
		//Helpers::dompdf_debug("trace", "($opacity, $mode)");
		$this->_set_line_transparency($mode, $opacity);
		$this->_set_fill_transparency($mode, $opacity);
	}