Application: gvSIG desktop

* Revision 1.1.2.3  2007-02-21 16:09:02  jaume

* *** empty log message ***

*

* Revision 1.1.2.2  2007/02/21 07:34:09  jaume

	public int getAlpha() {

		// will compute the acumulated opacity

		double myAlpha = 0;

		for (int i = 0; i < layers.length; i++) {

			double layerAlpha = layers[i].getAlpha()/255D;

			myAlpha += (1-myAlpha)*layerAlpha;

		}

		int result = (int) Math.round(myAlpha * 255); 

		return (result>255) ? 255 : result;

	}

	public void setAlpha(int outlineAlpha) {

		// first, get the biggest alpha in the layers and the index if such layer

		int maxAlpha = Integer.MIN_VALUE;

		int maxAlphaLayerIndex = 0;

		for (int i = 0; i < layers.length; i++) {

			if (layers[i].getAlpha() > maxAlpha) {

				maxAlpha = layers[i].getAlpha();

				maxAlphaLayerIndex = i;

			}

		}

		// now, max alpha takes the value of the desired alpha and the rest

		// will take a scaled (to biggest alpha) alpha value

		for (int i = 0; i < layers.length; i++) {

			if (i!=maxAlphaLayerIndex) {

				double scaledAlpha = (double) layers[i].getAlpha()/maxAlpha;

				layers[i].setAlpha((int) (outlineAlpha*scaledAlpha));

			} else {

				layers[i].setAlpha(outlineAlpha);

			}

		}

	}