📄 bgidemo.c
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/* RANDOMBARS: Display random bars */
/* */
void RandomBars(void)
{
int color;
MainWindow( "Random Bars" );
StatusLine( "Esc aborts or press a key..." ); /* Put msg at bottom of screen */
while( !kbhit() ){ /* Until user enters a key... */
color = random( MaxColors-1 )+1;
setcolor( color );
setfillstyle( random(11)+1, color );
bar3d( random( getmaxx() ), random( getmaxy() ),
random( getmaxx() ), random( getmaxy() ), 0, OFF);
}
Pause(); /* Pause for user's response */
}
/* */
/* TEXTDEMO: Show each font in several sizes to the user. */
/* */
void TextDemo(void)
{
int charsize[] = {
1, 3, 7, 3, 4, 2, 2, 2, 2, 2, 2 };
int font, size;
int h, x, y, i;
struct viewporttype vp;
char buffer[80];
for( font=0 ; font<NFONTS ; ++font ){ /* For each of the avail. fonts */
sprintf( buffer, "%s Demonstration", Fonts[font] );
MainWindow( buffer );
getviewsettings( &vp );
changetextstyle( font, VERT_DIR, charsize[font] );
settextjustify( CENTER_TEXT, BOTTOM_TEXT );
outtextxy( 2*textwidth("M"), vp.bottom - 2*textheight("M"), "Vertical" );
changetextstyle( font, HORIZ_DIR, charsize[font] );
settextjustify( LEFT_TEXT, TOP_TEXT );
outtextxy( 2*textwidth("M"), 2, "Horizontal" );
settextjustify( CENTER_TEXT, CENTER_TEXT );
x = (vp.right - vp.left) / 2;
y = textheight( "H" );
for( i=1 ; i<5 ; ++i ){ /* For each of the sizes */
size = (font == SMALL_FONT) ? i+3 : i;
changetextstyle( font, HORIZ_DIR, size );
h = textheight( "H" );
y += h;
sprintf( buffer, "Size %d", size );
outtextxy( x, y, buffer );
}
if( font != DEFAULT_FONT ){ /* Show user declared font size */
y += h / 2; /* Move down the screen */
settextjustify( CENTER_TEXT, TOP_TEXT );
setusercharsize( 5, 6, 3, 2 );
changetextstyle( font, HORIZ_DIR, USER_CHAR_SIZE );
outtextxy( (vp.right-vp.left)/2, y, "User Defined Size" );
}
Pause(); /* Pause to let user look */
} /* End of FONT loop */
}
/* */
/* COLORDEMO: Display the current color palette on the screen. */
/* */
void ColorDemo(void)
{
struct viewporttype vp;
int color, height, width;
int x, y, i, j;
char cnum[5];
MainWindow( "Color Demonstration" ); /* Show demonstration name */
color = 1;
getviewsettings( &vp ); /* Get the current window size */
width = 2 * ( (vp.right+1) / 16 ); /* Get box dimensions */
height = 2 * ( (vp.bottom-10) / 10 );
x = width / 2;
y = height / 2; /* Leave 1/2 box border */
for( j=0 ; j<3 ; ++j ){ /* Row loop */
for( i=0 ; i<5 ; ++i ){ /* Column loop */
setfillstyle(SOLID_FILL, color); /* Set to solid fill in color */
setcolor( color ); /* Set the same border color */
bar( x, y, x+width, y+height ); /* Draw the rectangle */
rectangle( x, y, x+width, y+height ); /* outline the rectangle */
if( color == BLACK ){ /* If box was black... */
setcolor( WHITE ); /* Set drawing color to white */
rectangle( x, y, x+width, y+height ); /* Outline black in white*/
}
itoa( color, cnum, 10 ); /* Convert # to ASCII */
outtextxy( x+(width/2), y+height+4, cnum ); /* Show color # */
color = ++color % MaxColors; /* Advance to the next color */
x += (width / 2) * 3; /* move the column base */
} /* End of Column loop */
y += (height / 2) * 3; /* move the row base */
x = width / 2; /* reset column base */
} /* End of Row loop */
Pause(); /* Pause for user's response */
}
/* */
/* ARCDEMO: Display a random pattern of arcs on the screen */
/* until the user says enough. */
/* */
void ArcDemo(void)
{
int mradius; /* Maximum radius allowed */
int eangle; /* Random end angle of Arc */
struct arccoordstype ai; /* Used to read Arc Cord info */
MainWindow( "Arc Demonstration" );
StatusLine( "ESC Aborts - Press a Key to stop" );
mradius = MaxY / 10; /* Determine the maximum radius */
while( !kbhit() ){ /* Repeat until a key is hit */
setcolor( random( MaxColors - 1 ) + 1 ); /* Randomly select a color */
eangle = random( 358 ) + 1; /* Select an end angle */
arc( random(MaxX), random(MaxY), random(eangle), eangle, mradius );
getarccoords( &ai ); /* Read Cord data */
line( ai.x, ai.y, ai.xstart, ai.ystart ); /* line from start to center */
line( ai.x, ai.y, ai.xend, ai.yend ); /* line from end to center */
} /* End of WHILE not KBHIT */
Pause(); /* Wait for user's response */
}
/* */
/* CIRCLEDEMO: Display a random pattern of circles on the screen */
/* until the user says enough. */
/* */
void CircleDemo(void)
{
int mradius; /* Maximum radius allowed */
MainWindow( "Circle Demonstration" );
StatusLine( "ESC Aborts - Press a Key to stop" );
mradius = MaxY / 10; /* Determine the maximum radius */
while( !kbhit() ){ /* Repeat until a key is hit */
setcolor( random( MaxColors - 1 ) + 1 ); /* Randomly select a color */
circle( random(MaxX), random(MaxY), random(mradius) );
} /* End of WHILE not KBHIT */
Pause(); /* Wait for user's response */
}
/* */
/* PIEDEMO: Display a pie chart on the screen. */
/* */
#define adjasp( y ) ((int)(AspectRatio * (double)(y)))
#define torad( d ) (( (double)(d) * PI ) / 180.0 )
void PieDemo(void)
{
struct viewporttype vp;
int xcenter, ycenter, radius, lradius;
int x, y;
double radians, piesize;
MainWindow( "Pie Chart Demonstration" );
getviewsettings( &vp ); /* Get the current viewport */
xcenter = (vp.right - vp.left) / 2; /* Center the Pie horizontally */
ycenter = (vp.bottom - vp.top) / 2+20;/* Center the Pie vertically */
radius = (vp.bottom - vp.top) / 3; /* It will cover 2/3rds screen */
piesize = (vp.bottom - vp.top) / 4.0; /* Optimum height ratio of pie */
while( (AspectRatio*radius) < piesize ) ++radius;
lradius = radius + ( radius / 5 ); /* Labels placed 20% farther */
changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 4 );
settextjustify( CENTER_TEXT, TOP_TEXT );
outtextxy( MaxX/2, 6, "This is a Pie Chart" );
changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 1 );
settextjustify( CENTER_TEXT, TOP_TEXT );
setfillstyle( SOLID_FILL, RED );
pieslice( xcenter+10, ycenter-adjasp(10), 0, 90, radius );
radians = torad( 45 );
x = xcenter + (int)( cos( radians ) * (double)lradius );
y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
settextjustify( LEFT_TEXT, BOTTOM_TEXT );
outtextxy( x, y, "25 %" );
setfillstyle( WIDE_DOT_FILL, GREEN );
pieslice( xcenter, ycenter, 90, 135, radius );
radians = torad( 113 );
x = xcenter + (int)( cos( radians ) * (double)lradius );
y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
settextjustify( RIGHT_TEXT, BOTTOM_TEXT );
outtextxy( x, y, "12.5 %" );
setfillstyle( INTERLEAVE_FILL, YELLOW );
settextjustify( RIGHT_TEXT, CENTER_TEXT );
pieslice( xcenter-10, ycenter, 135, 225, radius );
radians = torad( 180 );
x = xcenter + (int)( cos( radians ) * (double)lradius );
y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
settextjustify( RIGHT_TEXT, CENTER_TEXT );
outtextxy( x, y, "25 %" );
setfillstyle( HATCH_FILL, BLUE );
pieslice( xcenter, ycenter, 225, 360, radius );
radians = torad( 293 );
x = xcenter + (int)( cos( radians ) * (double)lradius );
y = ycenter - (int)( sin( radians ) * (double)lradius * AspectRatio );
settextjustify( LEFT_TEXT, TOP_TEXT );
outtextxy( x, y, "37.5 %" );
Pause(); /* Pause for user's response */
}
/* */
/* BARDEMO: Draw a 2-D bar chart using Bar and Rectangle. */
/* */
void BarDemo(void)
{
int barheight[] = {
1, 3, 5, 2, 4 };
int styles[] = {
1, 3, 10, 5, 9, 1 };
int xstep, ystep;
int sheight, swidth;
int i, j, h;
struct viewporttype vp;
char buffer[40];
MainWindow( "Bar / Rectangle demonstration" );
h = 3 * textheight( "H" );
getviewsettings( &vp );
settextjustify( CENTER_TEXT, TOP_TEXT );
changetextstyle( TRIPLEX_FONT, HORIZ_DIR, 4 );
outtextxy( MaxX /2, 6, "These are 2-D Bars" );
changetextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
setviewport( vp.left+50, vp.top+30, vp.right-50, vp.bottom-10, 1 );
getviewsettings( &vp );
sheight = vp.bottom - vp.top;
swidth = vp.right - vp.left;
line( h, h, h, sheight-h );
line( h, sheight-h, sheight-h, sheight-h );
ystep = (sheight - (2*h) ) / 5;
xstep = (swidth - (2*h) ) / 5;
j = sheight - h;
settextjustify( CENTER_TEXT, CENTER_TEXT );
for( i=0 ; i<6 ; ++i ){
line( h/2, j, h, j );
itoa( i, buffer, 10 );
outtextxy( 0, j, buffer );
j -= ystep;
}
j = h;
settextjustify( CENTER_TEXT, TOP_TEXT );
for( i=0 ; i<6 ; ++i ){
setfillstyle( styles[i], random(MaxColors) );
line( j, sheight - h, j, sheight- 3 - (h/2) );
itoa( i, buffer, 10 );
outtextxy( j, sheight - (h/2), buffer );
if( i != 5 ){
bar( j, (sheight-h)-(barheight[i] * ystep), j+xstep, sheight-h-1 );
rectangle( j, (sheight-h)-(barheight[i] * ystep), j+xstep, sheight-h);
}
j += xstep;
}
Pause();
}
/* */
/* LINERELDEMO: Display pattern using moverel and linerel cmds. */
/* */
void LineRelDemo(void)
{
struct viewporttype vp;
int h, w, dx, dy, cx, cy;
struct PTS outs[7];
MainWindow( "MoveRel / LineRel Demonstration" );
StatusLine( "Press any key to continue, ESC to Abort" );
getviewsettings( &vp );
cx = (vp.right - vp.left) / 2; /* Center of the screen coords */
cy = (vp.bottom - vp.top ) / 2;
h = (vp.bottom - vp.top ) / 8;
w = (vp.right - vp.left) / 9;
dx = 2 * w;
dy = 2 * h;
setcolor( BLACK );
setfillstyle( SOLID_FILL, BLUE );
bar( 0, 0, vp.right-vp.left, vp.bottom-vp.top ); /* Draw backgnd */
outs[0].x = cx - dx;
outs[0].y = cy - dy;
outs[1].x = cx - (dx-w);
outs[1].y = cy - (dy+h);
outs[2].x = cx + dx;
outs[2].y = cy - (dy+h);
outs[3].x = cx + dx;
outs[3].y = cy + dy;
outs[4].x = cx + (dx-w);
outs[4].y = cy + (dy+h);
outs[5].x = cx - dx;
outs[5].y = cy + (dy+h);
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