Pointer Events in Java

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1123 Pointer Events
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The Canvas class has methods that the application can override to handle pointer events Pointer events are events that are generated from a pointing device such as a stylus If the application needs to handle pointer events, it must override and implement the methods pointerPressed, pointerReleased, and pointerDragged
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Not all MIDP target devices support pointer events, and therefore the pointer methods might never be called The application can check whether the pointer and pointer motion events are available by calling CanvashasPointerEvents and CanvashasPointerMotionEvents
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113 Graphics
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All graphical operations are performed using a Graphics object This object encapsulates a context for drawing to a particular target entity, including the current drawing color, clip region, line style, and so on
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1131 Coordinate System
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The coordinate system's default origin is located at the upper-left corner, with the numeric values of the x-coordinates monotonically increasing from left to right, and the numeric values of the y-coordinates monotonically increasing from top to bottom
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Applications may assume that the horizontal and vertical values of the coordinate system represent equal distances on the actual device display If the shape of the pixels of the device is significantly different from square, the device does the required coordinate transformation
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The coordinate system represents the locations of pixels, not the pixels themselves Pixels have a width and height equal to 1 and extend down and to the left of their locating point For example, the pixel in the upper-left corner of the display is defined as (0,0) and covers the area where 0 <= x < 1 and 0 <= y < 1 All coordinates are specified as integers (See Figure 111)
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Figure 111 Pixel coordinate system showing the pixel at (4,3)
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1132 Clipping
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Each Graphics object has a single rectangular clip region; only those pixels within the clip region are modified by graphics operations Operations are provided for intersecting the current clip rectangle with a given rectangle (GraphicsclipRect) and for setting the current clip rectangle outright (GraphicssetClip) The methods GraphicsgetClipWidth, GraphicsgetClipHeight, GraphicsgetClipX, and GraphicsgetClipY are used for obtaining the current clip region
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114 Creating and Using Images
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1141 Immutable Images
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Images in a MIDP implementation may be either immutable or mutable Immutable Images can be created directly from resource files, binary data, RGB data, or other Images Once created, the contents of an immutable Image cannot be changed The ImagecreateImage(String name) method is used to create an immutable Image from binary data in a resource file bundled with the application in the application's JAR file The name must begin with "/" and include the full name of the binary file within the JAR file
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The ImagecreateImage(byte[], int offset, int length) method is used to create an immutable Image from binary data contained in a byte array
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The ImagecreateImage(Image image) method is used to create an immutable Image from another Image (which could be either mutable or immutable)
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The ImagecreateImage(javaioInputStream stream) method is used to create an immutable Image from a stream of binary data
The ImagecreateImage(Image image, int x, int y, int width, int height, int transform) method is used to create an immutable Image from the transformed region of another Image (which could be either mutable or immutable)
The ImagecreateRGBImage(int[] rgb, int width, int height, boolean alpha) method is used to create an immutable Image from an array of RGB color values, either with or without alpha channel data
If binary image data is used to create an Image, it must be in a format that is supported by the device Though some devices may optionally support additional formats, all devices must support Portable Network Graphics (PNG) format as specified by the W3C-PNG (Portable Network Graphics) Specification, Version 10 W3C Recommendation, October 1, 1996 This specification is available at http://wwww3org/TR/REC-pnghtml and as RFC 2083, available at http://wwwietforg/rfc/rfc2083txt