49 lines
979 B
C++
49 lines
979 B
C++
//x must be global.
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//Might as well make y global.
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F64 x,y,y_last;
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U0 Cartesian()
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{
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U8 *st;
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I64 ch=0,h,v;
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Bool first;
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CDC *dc=DCAlias;
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do {
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DocClear;
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"Enter algebraic equation to graph.\n"
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"Example: y=2*x\n"
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"y=";
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if (st=MGetS) {
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if (*st) {
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h=Fs->win_pixel_width/2;
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v=Fs->win_pixel_height/2;
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dc->color=RED;
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GrLine(dc,h,0,h,2*v+1);
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GrLine(dc,0,v,2*h+1,v);
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first=TRUE;
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dc->color=BLACK;
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for (x=-h;x<=h;x++) {
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y=-ExePrint("ToF64(%s);",st)(F64);
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if (!first)
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GrLine(dc,x-1+h,y_last+v,x+h,y+v);
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y_last=y;
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first=FALSE;
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}
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ch=GetChar;
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} else
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ch=CH_SHIFT_ESC;
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Free(st);
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} else
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ch=CH_SHIFT_ESC;
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DCFill;
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} while (ch!=CH_SHIFT_ESC && ch!=CH_ESC);
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DCDel(dc);
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}
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Cartesian;
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/*$WW,1$
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For better performance, compile the expression entered by the user one time with $LK,"LexExpression2Bin","MN:LexExpression2Bin"$() and use $LK,"Call","MN:Call"$(). See $LK-A,"::/TempleOS/Demo/CompileDemo.CPP"$.
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*/
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