50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
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/* VPOINT.CPP--Example from Chapter 5 of User's Guide */
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// VPOINT.CPP contains the definitions for the Point and Location
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// classes that are declared in the file vpoint.h
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#include "vpoint.h"
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#include <graphics.h>
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// member functions for the Location class
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Location::Location(int InitX, int InitY) {
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X = InitX;
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Y = InitY;
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};
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int Location::GetX(void) {
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return X;
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};
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int Location::GetY(void) {
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return Y;
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};
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// member functions for the Point class: These assume
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// the main program has initialized the graphics system
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Point::Point(int InitX, int InitY) : Location(InitX,InitY) {
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Visible = false; // make invisible by default
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};
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void Point::Show(void) {
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Visible = true;
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putpixel(X, Y, getcolor()); // uses default color
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};
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void Point::Hide(void) {
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Visible = false;
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putpixel(X, Y, getbkcolor()); // uses background color to erase
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};
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Boolean Point::IsVisible(void) {
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return Visible;
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};
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void Point::MoveTo(int NewX, int NewY) {
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Hide(); // make current point invisible
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X = NewX; // change X and Y coordinates to new location
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Y = NewY;
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Show(); // show point at new location
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};
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