[英]How do I draw a line in java using points?
我想知道如何在Java中使用不同的點畫一條線。 這是我到目前為止的代碼。 我寧願不獲取每個點的x和y,而只是讓程序自己使用x,y中的點。 我對編程還是很陌生,目前還不太擅長使用javadoc。 以下是我現在擁有的代碼:
//Create a Polygon class. A polygon is a closed shape with lines joining the corner points.
//You will keep the points in an array list. Use object of java.awt.Point for the point.
//Polygon will have as an instance variable an ArrayList of Points to hold the points
//The constructor takes no parameters but initializes the instance variable. The
//Polygon class also has the following methods:
// add: adds a Point to the polygon
// perimeter: returns the perimeter of the polygon
// draw: draws the polygon by connecting consecutive points and then
// connecting the last point to the first.
//
//No methods headers or javadoc is provided this time. You get to try your hand at writing
//a class almost from scratch
// Need help starting this question? In the lesson titled
// "Starting points: Problem Set Questions", go to the
// problem titled "Problem Set 6 - Question 3" for some tips on
// how to begin.
import java.util.ArrayList; import java.awt.Point;
public class Polygon {
ArrayList<Point> points;
/**
** a Polygon represents a shape with flat lines and several points.
*/
public Polygon(){
/**
* Constructs empty array of points.
*/
points = new ArrayList<Point>();
} /** ** Adds points to the polygon points Array. *@param = points x and y coordinates to add to class */
public void addPoints(Point point){
points.add(point);
}
/**
**gets distance between points in ArrayList
*/
public double perimeter(){
double perimeter = 0;
int i = 0;
while(i<points.size()){
if(i<points.size()-1){
perimeter = perimeter + points.get(i).distance(points.get(i+1));
}
else{
perimeter = perimeter + points.get(i).distance(points.get(0));
}
}
return perimeter;
}
/** * Draws Polygon using points from points ArrayList */
public void drawPolygon(){
int i = 0;
while(i < points.size()-1){
Line2D line = Line2D.Float(points.get(i), points.get(i+1));
line.draw();
}
Line2D lastLine = Line2D.Float(points.get(0), points.get(points.size()-1));
lastLine.draw();
} }
讓我正確理解這一點,您想實現draw()
方法嗎?
如果是這樣,您需要做的就是搜索布雷森納姆算法 ,該算法根據兩個給定點畫一條線。
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