mousex

Syntax

#include "graphics.h"

int mousex(void);

Description

The mousex function is available in the winbgim implementation of BGI graphics. It returns the most recent x coordinate of the mouse within the graphics window. X-coordinates start with 0 at the left edge of the window and increase to getmaxx( ) at the right edge of the window.

Return Value

Most recent x coordinate of the mouse within the graphics window

See also

getmaxx

mousey

registermousehandler

Example

/* mouse example */ 

#include "graphics.h"



// The click_handler will be called whenever the left mouse button is

// clicked. It checks copies the x,y coordinates of the click to

// see if the click was on a red pixel. If so, then the boolean

// variable red_clicked is set to true. Note that in general

// all handlers should be quick. If they need to do more than a little

// work, they should set a variable that will trigger the work going,

// and then return.

bool red_clicked = false;

void click_handler(int x, int y)

{

    if (getpixel(x,y) == RED)

        red_clicked = true;

}



// Call this function to draw an isosoles triangle with the given base and

// height. The triangle will be drawn just above the botton of the screen.

void triangle(int base, int height)

{

    int maxx = getmaxx( );

    int maxy = getmaxy( );



    line(maxx/2 - base/2, maxy - 10, maxx/2 + base/2, maxy - 10);

    line(maxx/2 - base/2, maxy - 10, maxx/2, maxy - 10 - height);

    line(maxx/2 + base/2, maxy - 10, maxx/2, maxy - 10 - height); 

}



void main(void)

{

    int maxx, maxy;  // Maximum x and y pixel coordinates

    int divisor;     // Divisor for the length of a triangle side



    // Put the machine into graphics mode and get the maximum coordinates:

    initwindow(450, 300);         

    maxx = getmaxx( );

    maxy = getmaxy( );



    // Register the function that handles a left mouse click

    registermousehandler(WM_LBUTTONDOWN, click_handler);

    

    // Draw a white circle with red inside and a radius of 50 pixels:

    setfillstyle(SOLID_FILL, RED);

    setcolor(WHITE);

    fillellipse(maxx/2, maxy/2, 50, 50);

    

    // Print a message and wait for a red pixel to be double clicked:

    settextstyle(DEFAULT_FONT, HORIZ_DIR, 2);

    outtextxy(20, 20, "Left click in RED to end.");

    setcolor(BLUE);

    red_clicked = false;

    divisor = 2;

    while (!red_clicked)

    {

        triangle(maxx/divisor, maxy/divisor);

        delay(500);

        divisor++;

    }



    cout << "The mouse was clicked at: ";

    cout << "x=" << mousex( );

    cout << " y=" << mousey( ) << endl;

    

    // Switch back to text mode:

    closegraph( );

}