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JAVA 2D API

JAVA 2D API. 簡介 影像 載入影像 Applet (Image) Application (Image) JPEG (BufferedImage) 顯示影像 Graphics Graphics2D. 簡介. JAVA 2D API 是 JAVA 2 的一組 core API, 可以用來進行繪圖並處理圖形 , 文字 , 影像 JDK 1.0 和 JDK1.1: Abstract Windowing Toolkit , AWT Java 2: AWT 使用者介面工具組 UI toolkit ( Swing )

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JAVA 2D API

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  1. JAVA 2D API

  2. 簡介 • 影像 • 載入影像 • Applet (Image) • Application (Image) • JPEG (BufferedImage) • 顯示影像 • Graphics • Graphics2D

  3. 簡介 • JAVA 2D API 是 JAVA 2 的一組core API,可以用來進行繪圖並處理圖形,文字,影像 • JDK 1.0 和 JDK1.1: • Abstract Windowing Toolkit , AWT • Java 2: • AWT • 使用者介面工具組 UI toolkit ( Swing ) • 繪圖工具組 ( 2D API )

  4. 影像 • java.awt.image ~ 矩形的彩色像素集合 • public abstract int getWidth(ImageObserver observer) • public abstract int getHeight(ImageObserver observer) • Java.awt.image.BufferedImage~ 可直接存取 • public int getWidth() • public int getHeight()

  5. 載入影像(Applet) • 格式: GIF JPEG ( Image ) • Applet(java.applet.Applet ) • public Image getImage(URL url) • public Image getImage(URL url, String name)

  6. 載入影像(Application 1) • Application ( java.awt.Toolkit) • public abstract Image getImage (URL url) • Public abstract Image getImage (URL url, String filename) • 透過呼叫Toolkit.getDefaultToolkit() Image mImage = Toolkit.getDefaultToolkit().getImage(“washer.gif”) • 會存在cache 中

  7. 載入影像(Application 2) • Application( java.awt.Toolkit) • public abstract Image createImage (URL url) • Public abstract Image createImage (URL url, String filename) • 不會存在cache 中

  8. JPEG編碼解碼器 • com.sun.image.codec.jpeg • codec ~ encoder/decoder • Public static JPEGImageDecoder createJPEGDecoder( InputStream src ) • Public static JPEGImageEncoder createJPEGEncoder( OutputStream src ) String filname = “washer.jpg”; FileInputStream in = new FileInputStream(filename); JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in); BufferImage image = decoder.decoderAsBufferedImage(); In.close();

  9. 顯示影像(Graphics 1) • public boolean drawImage (Image img, int x, int y,Color bgcolor, ImageObserver observer ) • 依圖片大小來呈現 • 原圖 呈現 (x,y)

  10. 顯示影像(Graphics 2) • public boolean drawImage(Image img, int x, int y, int width, int height,Color bgcolor, ImageObserver observer) • 以 x, y, width, height 決定的矩形來調整影像大小 • 原圖 呈現 (x,y) w h

  11. 顯示影像(Graphics 3) • public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int dx2,intdy2,Color bgcolor, ImageObserver observer) • 影像空間座標 使用者空間座標 (sx1,sy1) (dx1,dy1) (sx2,sy2) (dx2,dy2)

  12. 顯示影像(Graphics2D) • Public void drawImage (Image img, AffineTransform xform, ImageObserver observer) • Public void drawImage (BufferedImage img, BufferedImageOP op, int x, int y) • 呈現處理過的BufferedImage,並不會改變原來的BufferedImage

  13. ImageObserver • 在Graphics 和 Graphics2D中的drawImage() method都支援ImageObserver來監控下載的進程 • 開始下載通知ImageObserver • ImageObserver  repaint() drawImage()

  14. BufferedImage • BufferedImageOp代表影像處理的操作,他知道如何處理source image來產生destination image 來源 BufferedImage 目的地 BufferedImage BufferedImageOp

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