/
BGIDEMO.C
1403 lines (1086 loc) · 38.1 KB
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BGIDEMO.C
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/*
GRAPHICS DEMO FOR Borland C++ 3.0
Copyright (c) 1987,88,91 Borland International. All rights reserved.
From the command line, use:
bcc bgidemo graphics.lib
*/
#ifdef __TINY__
#error BGIDEMO will not run in the tiny model.
#endif
#include <dos.h>
#include <math.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <graphics.h>
#define ESC 0x1b /* Define the escape key */
#define TRUE 1 /* Define some handy constants */
#define FALSE 0 /* Define some handy constants */
#define PI 3.14159 /* Define a value for PI */
#define ON 1 /* Define some handy constants */
#define OFF 0 /* Define some handy constants */
#define NFONTS 11
char *Fonts[NFONTS] = {
"DefaultFont", "TriplexFont", "SmallFont",
"SansSerifFont", "GothicFont", "ScriptFont", "SimplexFont", "TriplexScriptFont",
"ComplexFont", "EuropeanFont", "BoldFont"
};
char *LineStyles[] = {
"SolidLn", "DottedLn", "CenterLn", "DashedLn", "UserBitLn"
};
char *FillStyles[] = {
"EmptyFill", "SolidFill", "LineFill", "LtSlashFill",
"SlashFill", "BkSlashFill", "LtBkSlashFill", "HatchFill",
"XHatchFill", "InterleaveFill", "WideDotFill", "CloseDotFill"
};
char *TextDirect[] = {
"HorizDir", "VertDir"
};
char *HorizJust[] = {
"LeftText", "CenterText", "RightText"
};
char *VertJust[] = {
"BottomText", "CenterText", "TopText"
};
struct PTS {
int x, y;
}; /* Structure to hold vertex points */
int GraphDriver; /* The Graphics device driver */
int GraphMode; /* The Graphics mode value */
double AspectRatio; /* Aspect ratio of a pixel on the screen*/
int MaxX, MaxY; /* The maximum resolution of the screen */
int MaxColors; /* The maximum # of colors available */
int ErrorCode; /* Reports any graphics errors */
struct palettetype palette; /* Used to read palette info */
/* */
/* Function prototypes */
/* */
void Initialize(void);
void ReportStatus(void);
void TextDump(void);
void Bar3DDemo(void);
void RandomBars(void);
void TextDemo(void);
void ColorDemo(void);
void ArcDemo(void);
void CircleDemo(void);
void PieDemo(void);
void BarDemo(void);
void LineRelDemo(void);
void PutPixelDemo(void);
void PutImageDemo(void);
void LineToDemo(void);
void LineStyleDemo(void);
void CRTModeDemo(void);
void UserLineStyleDemo(void);
void FillStyleDemo(void);
void FillPatternDemo(void);
void PaletteDemo(void);
void PolyDemo(void);
void SayGoodbye(void);
void Pause(void);
void MainWindow(char *header);
void StatusLine(char *msg);
void DrawBorder(void);
void changetextstyle(int font, int direction, int charsize);
int gprintf(int *xloc, int *yloc, char *fmt, ... );
/* */
/* Begin main function */
/* */
int main()
{
Initialize(); /* Set system into Graphics mode */
ReportStatus(); /* Report results of the initialization */
ColorDemo(); /* Begin actual demonstration */
if( GraphDriver==EGA || GraphDriver==EGALO || GraphDriver==VGA )
PaletteDemo();
PutPixelDemo();
PutImageDemo();
Bar3DDemo();
BarDemo();
RandomBars();
ArcDemo();
CircleDemo();
PieDemo();
LineRelDemo();
LineToDemo();
LineStyleDemo();
UserLineStyleDemo();
TextDump();
TextDemo();
CRTModeDemo();
FillStyleDemo();
FillPatternDemo();
PolyDemo();
SayGoodbye(); /* Give user the closing screen */
closegraph(); /* Return the system to text mode */
return(0);
}
/* */
/* INITIALIZE: Initializes the graphics system and reports */
/* any errors which occured. */
/* */
void Initialize(void)
{
int xasp, yasp; /* Used to read the aspect ratio*/
GraphDriver = DETECT; /* Request auto-detection */
initgraph( &GraphDriver, &GraphMode, "" );
ErrorCode = graphresult(); /* Read result of initialization*/
if( ErrorCode != grOk ){ /* Error occured during init */
printf(" Graphics System Error: %s\n", grapherrormsg( ErrorCode ) );
exit( 1 );
}
getpalette( &palette ); /* Read the palette from board */
MaxColors = getmaxcolor() + 1; /* Read maximum number of colors*/
MaxX = getmaxx();
MaxY = getmaxy(); /* Read size of screen */
getaspectratio( &xasp, &yasp ); /* read the hardware aspect */
AspectRatio = (double)xasp / (double)yasp; /* Get correction factor */
}
/* */
/* REPORTSTATUS: Report the current configuration of the system */
/* after the auto-detect initialization. */
/* */
void ReportStatus(void)
{
struct viewporttype viewinfo; /* Params for inquiry procedures*/
struct linesettingstype lineinfo;
struct fillsettingstype fillinfo;
struct textsettingstype textinfo;
struct palettetype palette;
char *driver, *mode; /* Strings for driver and mode */
int x, y;
getviewsettings( &viewinfo );
getlinesettings( &lineinfo );
getfillsettings( &fillinfo );
gettextsettings( &textinfo );
getpalette( &palette );
x = 10;
y = 4;
MainWindow( "Status report after InitGraph" );
settextjustify( LEFT_TEXT, TOP_TEXT );
driver = getdrivername();
mode = getmodename(GraphMode); /* get current setting */
gprintf( &x, &y, "Graphics device : %-20s (%d)", driver, GraphDriver );
gprintf( &x, &y, "Graphics mode : %-20s (%d)", mode, GraphMode );
gprintf( &x, &y, "Screen resolution : ( 0, 0, %d, %d )", getmaxx(), getmaxy() );
gprintf( &x, &y, "Current view port : ( %d, %d, %d, %d )",
viewinfo.left, viewinfo.top, viewinfo.right, viewinfo.bottom );
gprintf( &x, &y, "Clipping : %s", viewinfo.clip ? "ON" : "OFF" );
gprintf( &x, &y, "Current position : ( %d, %d )", getx(), gety() );
gprintf( &x, &y, "Colors available : %d", MaxColors );
gprintf( &x, &y, "Current color : %d", getcolor() );
gprintf( &x, &y, "Line style : %s", LineStyles[ lineinfo.linestyle ] );
gprintf( &x, &y, "Line thickness : %d", lineinfo.thickness );
gprintf( &x, &y, "Current fill style : %s", FillStyles[ fillinfo.pattern ] );
gprintf( &x, &y, "Current fill color : %d", fillinfo.color );
gprintf( &x, &y, "Current font : %s", Fonts[ textinfo.font ] );
gprintf( &x, &y, "Text direction : %s", TextDirect[ textinfo.direction ] );
gprintf( &x, &y, "Character size : %d", textinfo.charsize );
gprintf( &x, &y, "Horizontal justify : %s", HorizJust[ textinfo.horiz ] );
gprintf( &x, &y, "Vertical justify : %s", VertJust[ textinfo.vert ] );
Pause(); /* Pause for user to read screen*/
}
/* */
/* TEXTDUMP: Display the all the characters in each of the */
/* available fonts. */
/* */
void TextDump()
{
static int CGASizes[] = {
1, 3, 7, 3, 3, 2, 2, 2, 2, 2, 2 };
static int NormSizes[] = {
1, 4, 7, 4, 4, 2, 2, 2, 2, 2, 2 };
char buffer[80];
int font, ch, wwidth, lwidth, size;
struct viewporttype vp;
for( font=0 ; font<NFONTS ; ++font ){ /* For each available font */
sprintf( buffer, "%s Character Set", Fonts[font] );
MainWindow( buffer ); /* Display fontname as banner */
getviewsettings( &vp ); /* read current viewport */
settextjustify( LEFT_TEXT, TOP_TEXT );
moveto( 2, 3 );
buffer[1] = '\0'; /* Terminate string */
wwidth = vp.right - vp.left; /* Determine the window width */
lwidth = textwidth( "H" ); /* Get average letter width */
if( font == DEFAULT_FONT ){
changetextstyle( font, HORIZ_DIR, 1 );
ch = 0;
while( ch < 256 ){ /* For each possible character */
buffer[0] = ch; /* Put character into a string */
outtext( buffer ); /* send string to screen */
if( (getx() + lwidth) > wwidth )
moveto( 2, gety() + textheight("H") + 3 );
++ch; /* Goto the next character */
}
}
else{
size = (MaxY < 200) ? CGASizes[font] : NormSizes[font];
changetextstyle( font, HORIZ_DIR, size );
ch = '!'; /* Begin at 1st printable */
while( ch < 256 ){ /* For each printable character */
buffer[0] = ch; /* Put character into a string */
outtext( buffer ); /* send string to screen */
if( (lwidth+getx()) > wwidth ) /* Are we still in window? */
moveto( 2, gety()+textheight("H")+3 );
++ch; /* Goto the next character */
}
}
Pause(); /* Pause until user acks */
} /* End of FONT loop */
}
/* */
/* BAR3DDEMO: Display a 3-D bar chart on the screen. */
/* */
void Bar3DDemo(void)
{
static int barheight[] = {
1, 3, 5, 4, 3, 2, 1, 5, 4, 2, 3 };
struct viewporttype vp;
int xstep, ystep;
int i, j, h, color, bheight;
char buffer[10];
MainWindow( "Bar 3-D / 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 3-D Bars" );
changetextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
setviewport( vp.left+50, vp.top+40, vp.right-50, vp.bottom-10, 1 );
getviewsettings( &vp );
line( h, h, h, vp.bottom-vp.top-h );
line( h, (vp.bottom-vp.top)-h, (vp.right-vp.left)-h, (vp.bottom-vp.top)-h );
xstep = ((vp.right-vp.left) - (2*h)) / 10;
ystep = ((vp.bottom-vp.top) - (2*h)) / 5;
j = (vp.bottom-vp.top) - 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<11 ; ++i ){
color = random( MaxColors );
setfillstyle( i+1, color );
line( j, (vp.bottom-vp.top)-h, j, (vp.bottom-vp.top-3)-(h/2) );
itoa( i, buffer, 10 );
outtextxy( j, (vp.bottom-vp.top)-(h/2), buffer );
if( i != 10 ){
bheight = (vp.bottom-vp.top) - h - 1;
bar3d( j, (vp.bottom-vp.top-h)-(barheight[i]*ystep), j+xstep, bheight, 15, 1 );
}
j += xstep;
}
Pause(); /* Pause for user's response */
}
/* */
/* 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);
outs[6].x = cx - dx;
outs[6].y = cy - dy;
setfillstyle( SOLID_FILL, WHITE );
fillpoly( 7, (int far *)outs );
outs[0].x = cx - (w/2);
outs[0].y = cy + h;
outs[1].x = cx + (w/2);
outs[1].y = cy + h;
outs[2].x = cx + (w/2);
outs[2].y = cy - h;
outs[3].x = cx - (w/2);
outs[3].y = cy - h;
outs[4].x = cx - (w/2);
outs[4].y = cy + h;
setfillstyle( SOLID_FILL, BLUE );
fillpoly( 5, (int far *)outs );
/* Draw a Tesseract object on the screen using the LineRel and */
/* MoveRel drawing commands. */
moveto( cx-dx, cy-dy );
linerel( w, -h );
linerel( 3*w, 0 );
linerel( 0, 5*h );
linerel( -w, h );
linerel( -3*w, 0 );
linerel( 0, -5*h );
moverel( w, -h );
linerel( 0, 5*h );
linerel( w+(w/2), 0 );
linerel( 0, -3*h );
linerel( w/2, -h );
linerel( 0, 5*h );
moverel( 0, -5*h );
linerel( -(w+(w/2)), 0 );
linerel( 0, 3*h );
linerel( -w/2, h );
moverel( w/2, -h );
linerel( w, 0 );
moverel( 0, -2*h );
linerel( -w, 0 );
Pause(); /* Wait for user's response */
}
/* */
/* PUTPIXELDEMO: Display a pattern of random dots on the screen */
/* and pick them back up again. */
/* */
void PutPixelDemo(void)
{
int seed = 1958;
int i, x, y, h, w, color;
struct viewporttype vp;
MainWindow( "PutPixel / GetPixel Demonstration" );
getviewsettings( &vp );
h = vp.bottom - vp.top;
w = vp.right - vp.left;
srand( seed ); /* Restart random # function */
for( i=0 ; i<5000 ; ++i ){ /* Put 5000 pixels on screen */
x = 1 + random( w - 1 ); /* Generate a random location */
y = 1 + random( h - 1 );
color = random( MaxColors );
putpixel( x, y, color );
}
srand( seed ); /* Restart Random # at same # */
for( i=0 ; i<5000 ; ++i ){ /* Take the 5000 pixels off */
x = 1 + random( w - 1 ); /* Generate a random location */
y = 1 + random( h - 1 );
color = getpixel( x, y ); /* Read the color pixel */
if( color == random( MaxColors ) ) /* Used to keep RANDOM in sync */
putpixel( x, y, 0 ); /* Write pixel to BLACK */
}
Pause(); /* Wait for user's response */
}
/* */
/* PUTIMAGEDEMO */
/* */
void PutImageDemo(void)
{
static int r = 20;
static int StartX = 100;
static int StartY = 50;
struct viewporttype vp;
int PauseTime, x, y, ulx, uly, lrx, lry, size, i, width, height, step;
void *Saucer;
MainWindow("GetImage / PutImage Demonstration");
getviewsettings( &vp );
/* Draw Saucer */
setfillstyle( SOLID_FILL, getmaxcolor() );
fillellipse(StartX, StartY, r, (r/3)+2);
ellipse(StartX, StartY-4, 190, 357, r, r/3);
line(StartX+7, StartY-6, StartX+10, StartY-12);
circle(StartX+10, StartY-12, 2);
line(StartX-7, StartY-6, StartX-10, StartY-12);
circle(StartX-10, StartY-12, 2);
/* Read saucer image */
ulx = StartX-(r+1);
uly = StartY-14;
lrx = StartX+(r+1);
lry = StartY+(r/3)+3;
width = lrx - ulx + 1;
height = lry - uly + 1;
size = imagesize(ulx, uly, lrx, lry);
Saucer = malloc( size );
getimage(ulx, uly, lrx, lry, Saucer);
putimage(ulx, uly, Saucer, XOR_PUT);
/* Plot some "stars" */
for ( i=0 ; i<1000; ++i )
putpixel(random(MaxX), random(MaxY), random( MaxColors-1 )+1);
x = MaxX / 2;
y = MaxY / 2;
PauseTime = 70;
/* until a key is hit */
while ( !kbhit() ) {
/* Draw the Saucer */
putimage(x, y, Saucer, XOR_PUT); /* draw image */
delay(PauseTime);
putimage(x, y, Saucer, XOR_PUT); /* erase image */
/* Move Saucer */
step = random( 2*r );
if ((step/2) % 2 != 0 )
step = -1 * step;
x = x + step;
step = random( r );
if ((step/2) % 2 != 0 )
step = -1 * step;
y = y + step;
if (vp.left + x + width - 1 > vp.right)
x = vp.right-vp.left-width + 1;
else
if (x < 0)
x = 0;
if (vp.top + y + height - 1 > vp.bottom)
y = vp.bottom-vp.top-height + 1;
else
if (y < 0)
y = 0;
}
free( Saucer );
Pause();
}
/* */
/* LINETODEMO: Display a pattern using moveto and lineto commands. */
/* */
#define MAXPTS 15
void LineToDemo(void)
{
struct viewporttype vp;
struct PTS points[MAXPTS];
int i, j, h, w, xcenter, ycenter;
int radius, angle, step;
double rads;
MainWindow( "MoveTo / LineTo Demonstration" );
getviewsettings( &vp );
h = vp.bottom - vp.top;
w = vp.right - vp.left;
xcenter = w / 2; /* Determine the center of circle */
ycenter = h / 2;
radius = (h - 30) / (AspectRatio * 2);
step = 360 / MAXPTS; /* Determine # of increments */
angle = 0; /* Begin at zero degrees */
for( i=0 ; i<MAXPTS ; ++i ){ /* Determine circle intercepts */
rads = (double)angle * PI / 180.0; /* Convert angle to radians */
points[i].x = xcenter + (int)( cos(rads) * radius );
points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio );
angle += step; /* Move to next increment */
}
circle( xcenter, ycenter, radius ); /* Draw bounding circle */
for( i=0 ; i<MAXPTS ; ++i ){ /* Draw the cords to the circle */
for( j=i ; j<MAXPTS ; ++j ){ /* For each remaining intersect */
moveto(points[i].x, points[i].y); /* Move to beginning of cord */
lineto(points[j].x, points[j].y); /* Draw the cord */
}
}
Pause(); /* Wait for user's response */
}
/* */
/* LINESTYLEDEMO: Display a pattern using all of the standard */
/* line styles that are available. */
/* */
void LineStyleDemo(void)
{
int style, step;
int x, y, w;
struct viewporttype vp;
char buffer[40];
MainWindow( "Pre-defined line styles" );
getviewsettings( &vp );
w = vp.right - vp.left;
x = 35;
y = 10;
step = w / 11;
settextjustify( LEFT_TEXT, TOP_TEXT );
outtextxy( x, y, "Normal Width" );
settextjustify( CENTER_TEXT, TOP_TEXT );
for( style=0 ; style<4 ; ++style ){
setlinestyle( style, 0, NORM_WIDTH );
line( x, y+20, x, vp.bottom-40 );
itoa( style, buffer, 10 );
outtextxy( x, vp.bottom-30, buffer );
x += step;
}
x += 2 * step;
settextjustify( LEFT_TEXT, TOP_TEXT );
outtextxy( x, y, "Thick Width" );
settextjustify( CENTER_TEXT, TOP_TEXT );
for( style=0 ; style<4 ; ++style ){
setlinestyle( style, 0, THICK_WIDTH );
line( x, y+20, x, vp.bottom-40 );
itoa( style, buffer, 10 );
outtextxy( x, vp.bottom-30, buffer );
x += step;
}
settextjustify( LEFT_TEXT, TOP_TEXT );
Pause(); /* Wait for user's response */
}
/* */
/* CRTMODEDEMO: Demonstrate the effects of the change mode */
/* commands on the current screen. */
/* */
void CRTModeDemo(void)
{
struct viewporttype vp;
int mode;
MainWindow( "SetGraphMode / RestoreCRTMode demo" );
getviewsettings( &vp );
mode = getgraphmode();
settextjustify( CENTER_TEXT, CENTER_TEXT );
outtextxy( (vp.right-vp.left)/2, (vp.bottom-vp.top)/2,
"Now you are in graphics mode..." );
StatusLine( "Press any key for text mode..." );
getch();
restorecrtmode();
printf( "Now you are in text mode.\n\n" );
printf( "Press any key to go back to graphics..." );