File	Doc	Category	Size	Date	Package
Layer.java	API Doc	J2ME MIDP 2.0	6647	Thu Nov 07 12:02:28 GMT 2002	javax.microedition.lcdui.game

Layer

• java.lang.Object

Fields Summary
int	x position of layer in x offset
int	y position of layer in y offset
int	width width of layer
int	height height of layer
boolean	visible If the Layer is visible it will be drawn when paint is called.

Constructors Summary
Layer(int width, int height) Creates a new Layer with the specified dimensions. This constructor is declared package scope to prevent developers from creating Layer subclasses By default, a Layer is visible and its upper-left corner is positioned at (0,0). param width The width of the layer, in pixels param height The height of the layer, in pixels setWidthImpl(width); setHeightImpl(height);

Methods Summary
public final int	getHeight() Gets the current height of this layer, in pixels. return the height in pixels see #getWidth return height;
public final int	getWidth() Gets the current width of this layer, in pixels. return the width in pixels see #getHeight return width;
public final int	getX() Gets the horizontal position of this Layer's upper-left corner in the painter's coordinate system. return the Layer's horizontal position. see #getY see #setPosition see #move return x;
public final int	getY() Gets the vertical position of this Layer's upper-left corner in the painter's coordinate system. return the Layer's vertical position. see #getX see #setPosition see #move return y;
public final boolean	isVisible() Gets the visibility of this Layer. return true if the Layer is visible, false if it is invisible. see #setVisible return visible;
public void	move(int dx, int dy) Moves this Layer by the specified horizontal and vertical distances. The Layer's coordinates are subject to wrapping if the passed parameters will cause them to exceed beyond Integer.MAX_VALUE or Integer.MIN_VALUE. param dx the distance to move along horizontal axis (positive to the right, negative to the left) param dy the distance to move along vertical axis (positive down, negative up) see #setPosition see #getX see #getY x += dx; y += dy;
public abstract void	paint(javax.microedition.lcdui.Graphics g) Paints this Layer if it is visible. The upper-left corner of the Layer is rendered at it's current (x,y) position relative to the origin of the provided Graphics object. Applications may make use of Graphics clipping and translation to control where the Layer is rendered and to limit the region that is rendered. Implementations of this method are responsible for checking if this Layer is visible; this method does nothing if the Layer is not visible. The attributes of the Graphics object (clip region, translation, drawing color, etc.) are not modified as a result of calling this method. param g the graphics object for rendering the Layer throws NullPointerException if g is null
void	setHeightImpl(int height) Sets the current height of this layer, in pixels. The Layer's height is used to determine its bounds for rendering purposes. param height The height in pixels throws IllegalArgumentException if the specified height is less than 0 see #setWidthImpl see #getHeight see #getWidth if (height < 0) { throw new IllegalArgumentException(); } this.height = height;
public void	setPosition(int x, int y) Sets this Layer's position such that its upper-left corner is located at (x,y) in the painter's coordinate system. A Layer is located at (0,0) by default. param x the horizontal position param y the vertical position see #move see #getX see #getY this.x = x; this.y = y;
public void	setVisible(boolean visible) Sets the visibility of this Layer. A visible Layer is rendered when its {@link #paint(Graphics)} method is called; an invisible Layer is not rendered. param visible true to make the Layer visible, false to make it invisible see #isVisible this.visible = visible;
void	setWidthImpl(int width) Sets the current width of this layer, in pixels. The Layer's width is used to determine its bounds for rendering purposes. param width The width in pixels throws IllegalArgumentException if the specified width is less than 0 see #setHeightImpl see #getHeight see #getWidth if (width < 0) { throw new IllegalArgumentException(); } this.width = width;