Add graph, plot

src/cmd/plot/libplot/text.c

@@ -0,0 +1,39 @@
+/*
+          t string  Place the string so that its first character is
+                    centered on the current point (default).  If
+                    string begins with `\C' (`\R'), it is centered
+                    (right-adjusted) on the current point.  A
+                    backslash at the beginning of the string may be
+                    escaped with another backslash.
+ */
+#include "mplot.h"
+void text(char *s){
+	register int	kx, ky;
+	int centered, right, more;
+	char *ss;
+	ss=s;
+	for(;;){
+		centered=right=more=0;
+		if(*ss=='\\'){
+			ss++;
+			switch(*ss){
+			case 'C': centered++; ss++; break;
+			case 'R': right++; ss++; break;
+			case 'L': ss++; break;
+			case 'n': --ss; break;
+			}
+		}
+		for(s=ss;*ss!='\0';ss++)
+			if(ss[0]=='\\' && ss[1]=='n'){
+				more++;
+				break;
+			}
+		kx = SCX(e1->copyx);
+		ky = SCY(e1->copyy);
+		ky=m_text(kx, ky, s, ss, e1->foregr, centered, right);
+		if(!more)break;
+		e1->copyy = ( (double)(ky) - e1->bottom)/e1->scaley + e1->ymin + .5;
+		move(e1->copyx, e1->copyy);
+		ss+=2;
+	}
+}