adds news item & alt text to vignette images

NEWS.md

@@ -2,6 +2,7 @@
 
 #### Updates:
 
+* Fixes cases of asymmetric (type 3) strategies not generating entry signals if the exit condition not yet been met (thanks @bbac63 #9).
 * Internal performance enhancements.
 
 # ichimoku 1.5.3

vignettes/reference.Rmd

@@ -227,6 +227,7 @@ Call `plot()` on an ichimoku object to visualize the cloud chart.
 The example below demonstrates some of the arguments that can be supplied to customise the plot.
 
 ```{r plot2}
+#| fig.alt: ichimoku cloud plot of sample data series
 plot(cloud, window = "2020-05/", ticker = "SYM (JSE)", subtitle = "Sample Data Series")
 ```
 
@@ -275,6 +276,7 @@ The fast S-type line is calculated as 100 times the ratio of the closing price m
 Note the difference to the usual stochastic oscillator definition where the slow line is a 3-period moving average of the fast line.
 
 ```{r plots}
+#| fig.alt: ichimoku cloud plot using solarized theme, with windowed data and an S-type oscillator sub-plot
 plot(cloud, window = "2020-04-01/2020-12-01", theme = "solarized", type = "s")
 ```
 
@@ -287,6 +289,7 @@ The character string supplied to 'custom' is a regular expression pattern that i
 To view a custom sub-plot, type must be specified as either 'bar' or 'line' as the type setting takes precedence (with a default of 'none').
 
 ```{r plotbar}
+#| fig.alt: ichimoku cloud plot using mono theme and with a bar-type sub-plot
 plot(kumo, window = "2020-04/2020-11", theme = "mono", type = "bar", custom = "volume")
 ```
 

vignettes/strategies.Rmd

@@ -112,6 +112,7 @@ See [strategy summary specification](#strategy-summary-specification) for detail
 ### 4. Visualize by calling `plot()` or `iplot()`.
 
 ```{r plot}
+#| fig.alt: strategy-augmented ichimoku cloud plot using dark theme
 plot(strat, theme = "dark")
 ```
 

vignettes/xoanda.Rmd

@@ -143,7 +143,7 @@ As all parameters can be set interactively in-app, `oanda_studio()` may be calle
 ```{r oandas, eval=FALSE}
 oanda_studio()
 ```
-![](oanda-studio.jpg)
+![screenshot of oanda_studio instance showing the data cursor](oanda-studio.jpg)
 
 The following additional parameters can be used to customise the behaviour of the Shiny environment:
 
@@ -257,7 +257,7 @@ df <- oanda_positions("GBP_JPY")
 ```
 
 ```{r oandaposchart, echo=FALSE}
-
+#| fig.alt: sample positions chart for GBPJPY
 df <- structure(list(price = c(124.75, 124.85, 124.9, 124.95, 125.05, 
 125.2, 125.25, 125.3, 125.35, 125.4, 125.5, 125.6, 125.7, 125.85, 
 126, 126.2, 126.4, 126.5, 126.55, 126.65, 126.7, 126.75, 126.85, 
@@ -542,7 +542,6 @@ layers <- list(
   ggplot2::coord_flip(),
   ichimoku:::theme_ichimoku_light()
 )
-
 print(ggplot2::ggplot(data = df) + layers)
 
 ```