From 0e57bfcf262a2b2a6a4c8148353cdaed7dc91c9c Mon Sep 17 00:00:00 2001
From: Johannes Ranke <jranke@uni-bremen.de>
Date: Wed, 7 Dec 2016 21:22:15 +0100
Subject: Use latex in plots when using tikzDevice

---
 R/plot.mkinfit.R | 11 +++++++++--
 R/plot.mmkin.R   | 12 ++++++++++--
 2 files changed, 19 insertions(+), 4 deletions(-)

(limited to 'R')

diff --git a/R/plot.mkinfit.R b/R/plot.mkinfit.R
index 3df6c81c..b42ce097 100644
--- a/R/plot.mkinfit.R
+++ b/R/plot.mkinfit.R
@@ -172,8 +172,15 @@ plot.mkinfit <- function(x, fit = x,
         }
       }
 
-      chi2 <- paste0(signif(100 * mkinerrmin(fit)[errmin_var, "err.min"], errmin_digits), "%")
-      mtext(bquote(chi^2 ~ "error level" == .(chi2)), cex = 0.7, line = 0.4)
+      chi2 <- signif(100 * mkinerrmin(fit)[errmin_var, "err.min"], errmin_digits)
+      # Use LateX if the current plotting device is tikz
+      if (names(dev.cur()) == "tikz output") {
+        chi2_text <- paste0("$\\chi^2$ error level = ", chi2, "\\%")
+      } else {
+        chi2_perc <- paste0(chi2, "%")
+        chi2_text <- bquote(chi^2 ~ "error level" == .(chi2_perc))
+      }
+      mtext(chi2_text, cex = 0.7, line = 0.4)
     }
 
     # Show residuals if requested
diff --git a/R/plot.mmkin.R b/R/plot.mmkin.R
index 562bbb71..ee7075d3 100644
--- a/R/plot.mmkin.R
+++ b/R/plot.mmkin.R
@@ -79,8 +79,16 @@ plot.mmkin <- function(x, main = "auto", legends = 1, errmin_var = "All data", e
                        datasets = colnames(x)[i.fit],
                        none = "")
 
-    chi2 <- paste0(signif(100 * mkinerrmin(fit)[errmin_var, "err.min"], errmin_digits), "%")
-    mtext(bquote(.(fit_name) ~ chi^2 ~ "error level" == .(chi2)), cex = cex, line = 0.4)
+    chi2 <- signif(100 * mkinerrmin(fit)[errmin_var, "err.min"], errmin_digits)
+
+    # Use LateX if the current plotting device is tikz
+    if (names(dev.cur()) == "tikz output") {
+      chi2_text <- paste0(fit_name, " $\\chi^2$ error level = ", chi2, "\\%")
+    } else {
+      chi2_perc <- paste0(chi2, "%")
+      chi2_text <- bquote(.(fit_name) ~ chi^2 ~ "error level" == .(chi2_perc))
+    }
+    mtext(chi2_text, cex = cex, line = 0.4)
 
     mkinresplot(fit, legend = FALSE, ...)
     mtext(paste(fit_name, "residuals"), cex = cex, line = 0.4)
-- 
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