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NULL)
<BR> {
<BR> closegraph();
<BR> printf("Error: not
enough heap space in save_screen().\n");
<BR> exit(1);
<BR> }
<P> getimage(0, ystart, maxx, yend, buf[block]);
<BR> ystart = yend + 1;
<BR> yend += yincr + 1;
<BR> }
<BR>}
<P>void restore_screen(void far *buf[4])
<BR>{
<BR> int ystart=0, yend, yincr, block;
<P> yincr = (maxy+1) / 4;
<BR> yend = yincr;
<P> for (block=0; block<=3; block++)
<BR> {
<BR> putimage(0, ystart, buf[block], COPY_PUT);
<BR> farfree(buf[block]);
<BR> ystart = yend + 1;
<BR> yend += yincr + 1;
<BR> }
<BR>}
<BR>
<BR>
<P>函數名: getlinesettings
<BR>功 能: 取當前線型、模式和寬度
<BR>用 法: void far getlinesettings(struct linesettingstype far *lininfo):
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>/* the names of the line styles supported */
<BR>char *lname[] = { "SOLID_LINE",
<BR>
"DOTTED_LINE",
<BR>
"CENTER_LINE",
<BR>
"DASHED_LINE",
<BR>
"USERBIT_LINE"
<BR>
};
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> struct linesettingstype lineinfo;
<BR> int midx, midy;
<BR> char lstyle[80], lpattern[80], lwidth[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<P> /* get information about current line settings */
<BR> getlinesettings(&lineinfo);
<P> /* convert line information into strings */
<BR> sprintf(lstyle, "%s is the line style.",
<BR> lname[lineinfo.linestyle]);
<BR> sprintf(lpattern, "0x%X is the user-defined line pattern.",
<BR> lineinfo.upattern);
<BR> sprintf(lwidth, "%d is the line thickness.",
<BR> lineinfo.thickness);
<P> /* display the information */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(midx, midy, lstyle);
<BR> outtextxy(midx, midy+2*textheight("W"), lpattern);
<BR> outtextxy(midx, midy+4*textheight("W"), lwidth);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: getmaxcolor
<BR>功 能: 返回可以傳給函數setcolor的最大顏色值
<BR>用 法: int far getmaxcolor(void);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int midx, midy;
<BR> char colstr[80];
<P> /* initialize graphics and local variables
<BR> */ initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<P> /* grab the color info. and convert it to a string */
<BR> sprintf(colstr, "This mode supports colors 0..%d", getmaxcolor());
<P> /* display the information */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(midx, midy, colstr);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函數名: getmaxx
<BR>功 能: 返回屏幕的最大x坐標
<BR>用 法: int far getmaxx(void);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int midx, midy;
<BR> char xrange[80], yrange[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<P> /* convert max resolution values into strings */
<BR> sprintf(xrange, "X values range from 0..%d", getmaxx());
<BR> sprintf(yrange, "Y values range from 0..%d", getmaxy());
<P> /* display the information */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(midx, midy, xrange);
<BR> outtextxy(midx, midy+textheight("W"), yrange);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: getmaxy
<BR>功 能: 返回屏幕的最大y坐標
<BR>用 法: int far getmaxy(void);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int midx, midy;
<BR> char xrange[80], yrange[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<P> /* convert max resolution values into strings */
<BR> sprintf(xrange, "X values range from 0..%d", getmaxx());
<BR> sprintf(yrange, "Y values range from 0..%d", getmaxy());
<P> /* display the information */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(midx, midy, xrange);
<BR> outtextxy(midx, midy+textheight("W"), yrange);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<P>函數名: getmodename
<BR>功 能: 返回含有指定圖形模式名的字符串指針
<BR>用 法: char *far getmodename(int mode_name);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request autodetection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int midx, midy, mode;
<BR> char numname[80], modename[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<P> /* get mode number and name strings */
<BR> mode = getgraphmode();
<BR> sprintf(numname, "%d is the current mode number.", mode);
<BR> sprintf(modename, "%s is the current graphics mode.",
getmodename(mode));
<P> /* display the information */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(midx, midy, numname);
<BR> outtextxy(midx, midy+2*textheight("W"), modename);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: getmoderange
<BR>功 能: 取給定圖形驅動程序的模式范圍
<BR>用 法: void far getmoderange(int graphdriver, int far *lomode,
<BR> int far *himode);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int midx, midy;
<BR> int low, high;
<BR> char mrange[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<P> /* get the mode range for this driver */
<BR> getmoderange(gdriver, &low, &high);
<P> /* convert mode range info. into strings */
<BR> sprintf(mrange, "This driver supports modes %d..%d", low,
high);
<P> /* display the information */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(midx, midy, mrange);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: getpalette
<BR>功 能: 返回有關當前調色板的信息
<BR>用 法: void far getpalette(struct palettetype far *palette);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR>/* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> struct palettetype pal;
<BR> char psize[80], pval[20];
<BR> int i, ht;
<BR> int y = 10;
<P>/* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P>/* read result of initialization */
<BR> errorcode = graphresult();
<BR>/* an error occurred */
<BR> if (errorcode != grOk)
<BR> {
<BR> printf("Graphics error: %s\n",
<BR>
grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR>/* terminate with an error code */
<BR> exit(1);
<BR> }
<P>/* grab a copy of the palette */
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