Showing content from http://mathcs.clarku.edu/~djoyce/java/elements/../Geometry/LineElement.java below:
/*----------------------------------------------------------------------+ | Title: LineElement.java | | Java Class extends Element | | | | Author: David E. Joyce | | Department of Mathematics and Computer Science | | Clark University | | Worcester, MA 01610-1477 | | U.S.A. | | | | http://aleph0.clarku.edu/~djoyce/home.html | | djoyce@clarku.edu | | | | Date: February, 1996. Version 2.0.0 May, 1997. | +----------------------------------------------------------------------*/ import java.awt.*; public class LineElement extends Element { PointElement A,B; LineElement () {dimension = 1;} LineElement (PointElement Aval, PointElement Bval) { dimension = 1; A = Aval; B = Bval; } public String toString() { return "[" + name + ": " + A + " " + B + "]"; } protected boolean defined() {return A.defined() && B.defined();} protected void drawName (Graphics g, Dimension d) { if (nameColor!=null && name!=null && defined()) { int ix = (int)Math.round((A.x+B.x)/2.0); int iy = (int)Math.round((A.y+B.y)/2.0); drawString(ix,iy, g,d); } } protected void drawVertex (Graphics g) { if (vertexColor != null && defined()) { A.drawVertex(g,vertexColor); B.drawVertex(g,vertexColor); } } public static void drawEdge (PointElement A, PointElement B, Graphics g, Color c) { if (c!=null && A.defined() && B.defined()) { g.setColor(c); g.drawLine ((int)Math.round(A.x), (int)Math.round(A.y), (int)Math.round(B.x), (int)Math.round(B.y)); } } protected void drawEdge (Graphics g) {drawEdge(A,B,g,edgeColor);} }
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