我对Java很陌生，对绘制梯形有疑问 . 目前我不知道从哪里开始 . 你有什么想法，我可以在哪里开始，以及要照顾什么？我不想从中得到完整的代码，只是一些灵感，因为此刻我真的不知道

/*

* Trapezium.java -

*/

/**

* Represents a isosceles trapezium, that can be 'drawn' to the standard

* output stream. A trapezium is drawn with a foreground and background colour.

* The fore- and background colours are represented by two (different) characters.

* Each trapezium consists of a number of individual lines. Each line contains an

* odd number of foreground characters to be able to retain symmetry.

*/

public class Trapezium {

// Attributes/ Fields

/**

* The character representation of the default background.

*/

private static final char DEFAULT_BACKGROUND = 32;

/**

* The character representation of the default foreground.

*/

private static final char DEFAULT_FOREGROUND = 42;

/**

* The character representation of the indentation.

*/

private static final char INDENTATION = 32;

/**

* The number of lines used to draw the triangle itself.

*/

private int height;

/**

* The maximal number of characters per line used to draw the

* trapezium itself.

*/

private int width;

/**

* The size of the margin in characters.

*/

private int margin;

/**

* The foreground character.

*/

private char foreground;

/**

* The background character.

*/

private char background;

/**

* The number of characters at the top line of

* the trapezium.

*/

private int topWidth;

/**

* The number of characters at the bottom line of the trapezium.

*/

private int bottomWidth;

// Constructor

/**

* Creates a trapezium accepting a top and bottom width,

* a fore- and a background character as well as a value

* for the margin.

*

* @param topWidth - the width at the top of the trapezium as a non-negative number.

* @param bottomWidth - the width at the bottom of the trapezium as a non-negative number.

* @param foreground - the character used to draw the trapezium's foreground

* @param background - the character used to draw the trapezium's background

* @param margin - the non-negative number of characters to be used as margin at the left

* and right of the trapezium

*

*/

public Trapezium(int topWidth, int bottomWidth,

char foreground, char background,

int margin) {

this.topWidth = topWidth;

this.bottomWidth = bottomWidth;

this.foreground = foreground;

this.background = background;

this.margin = margin;

}

/**

* Creates a trapezium with the given width at the top and bottom

* and the size of the margin.

* Default values are used for the foreground and background.

*

* @param topWidth - the width at the top of the trapezium as a non-negative odd number.

* @param bottomWidth - the width at the bottom of the trapezium as a non-negative odd number.

* @param margin - the non-negative number of characters to be used as margin at the left

* and right of the trapezium

*

*/

public Trapezium(int topWidth,

int bottomWidth,

int margin) {

this.topWidth = topWidth;

this.bottomWidth = bottomWidth;

this.margin = margin;

}

/**

* Creates a trapezium without a margin with the given width at the top and bottom.

* Default values are used for the foreground and background.

*

* @param topWidth - the width at the top of the trapezium as a non-negative odd number.

* @param bottomWidth - the width at the bottom of the trapezium as a non-negative odd number.

*/

public Trapezium(int topWidth,

int bottomWidth) {

this.topWidth = topWidth;

this.bottomWidth = bottomWidth;

}

// Methods

/**

* Draws the triangle with no indentation.

* This method calls the more general 'draw' method.

*/

public void draw() {

// while

}

/**

* Draws the triangle with the given indentation.

*

* @param indentation - the indentation at which the triangle is drawn

*

*/

public void draw(int indentation) {

;

//while

}

/**

* Rotates the triangle 180 degrees.

*

*/

public void rotate() {

;

}

/**

* Prints a 'run' of a given character.

*

* @param character - the character to be repeated.

* @param length - the number of characters to print.

*

*/

private void printCharacterRun(char character, int length) {

;

}

/**

* Adds a newline to the output.

*

*/

private void printNewLine() {

}

}

测试员在另一个 class

trapezium = new Trapezium(5, 11, '*', '-', 2); // create a new Trapezium

trapezium.draw();

trapezium.rotate();

trapezium.draw(15);