Class Picture

  • public class Picture
extends java.lang.Object
    A picture from an image file.

    • Constructor Summary

      Constructors 
      Constructor Description
      Picture()
      Constructs an empty picture.
      Picture​(java.lang.String source)
      Constructs a picture from a given file name or URL.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void border​(int width)
      Adds a black border to the image.
      java.awt.Color getColorAt​(int x, int y)
      Gets the color of a pixel.
      int getHeight()
      Gets the height of this picture.
      int getWidth()
      Gets the width of this picture.
      void load​(java.lang.String source)
      Loads a picture from a given file or URL.
      void move​(int dx, int dy)
      Moves this picture by a given amount.
      void pick()
      Displays a file chooser for picking a file, loads the picture from the file that the user selected, and pauses so that the user can see the loaded picture.
      void scale​(int newWidth, int newHeight)
      Scales this picture to a new size.
      void setColorAt​(int x, int y, java.awt.Color c)
      Sets the color of a pixel.
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • Picture

        public Picture()
        Constructs an empty picture.

      • Picture

        public Picture​(java.lang.String source)
        Constructs a picture from a given file name or URL.
        Parameters:
        source - the filename or URL

    • Method Detail

      • load

        public void load​(java.lang.String source)
        Loads a picture from a given file or URL.
        Parameters:
        source - the filename or URL

      • pick

        public void pick()
        Displays a file chooser for picking a file, loads the picture from the file that the user selected, and pauses so that the user can see the loaded picture.

      • getWidth

        public int getWidth()
        Gets the width of this picture.
        Returns:
        the width

      • getHeight

        public int getHeight()
        Gets the height of this picture.
        Returns:
        the height

      • move

        public void move​(int dx,
                 int dy)
        Moves this picture by a given amount.
        Parameters:
        dx - the amount by which to move in x-direction
        dy - the amount by which to move in y-direction

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • getColorAt

        public java.awt.Color getColorAt​(int x,
                                 int y)
        Gets the color of a pixel.
        Parameters:
        x - the column index (between 0 and getWidth() - 1)
        y - the row index (between 0 and getHeight() - 1)
        Returns:
        the color of the pixel at position (x, y)

      • setColorAt

        public void setColorAt​(int x,
                       int y,
                       java.awt.Color c)
        Sets the color of a pixel.
        Parameters:
        x - the column index (between 0 and getWidth() - 1)
        y - the row index (between 0 and getHeight() - 1)
        c - the color for the pixel at position (x, y)

      • scale

        public void scale​(int newWidth,
                  int newHeight)
        Scales this picture to a new size.
        Parameters:
        newWidth - the new width of the picture
        newHeight - the new height of the picture

      • border

        public void border​(int width)
        Adds a black border to the image.
        Parameters:
        width - the border width