add the 'draw/rectangle' command

src/commands.h

@@ -24,6 +24,7 @@
 #include "plot/polygons.h"
 #include "plot/rectangles.h"
 #include "plot/vectors.h"
+#include "draw/rectangle.h"
 #include "figure/legend.h"
 
 namespace clip {
@@ -34,6 +35,7 @@ const CommandMap COMMANDS = {
   {"height", CommandFn(&context_configure)},
   {"dpi", CommandFn(&context_configure)},
   {"layout/margins", CommandFn(&layout_add_margins)},
+  {"draw/rectangle", CommandFn(&draw::rectangle)},
   {"plot/axes", CommandFn(&elements::plot::axis::axis_add_all)},
   {"plot/areas", CommandFn(&elements::plot::areas::areas_draw)},
   {"plot/axis", CommandFn(&elements::plot::axis::axis_draw)},

src/draw/rectangle.cc

@@ -0,0 +1,74 @@
+/**
+ * This file is part of the "clip" project
+ *   Copyright (c) 2018 Paul Asmuth
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "rectangle.h"
+#include "data.h"
+#include "sexpr.h"
+#include "sexpr_conv.h"
+#include "sexpr_util.h"
+#include "context.h"
+#include "color_reader.h"
+#include "style_reader.h"
+#include "typographic_map.h"
+#include "typographic_reader.h"
+#include "layout.h"
+#include "marker.h"
+#include "scale.h"
+#include "graphics/path.h"
+#include "graphics/brush.h"
+#include "graphics/text.h"
+#include "graphics/layout.h"
+
+#include <numeric>
+
+using namespace std::placeholders;
+using std::bind;
+
+namespace clip::draw {
+
+ReturnCode rectangle(
+    Context* ctx,
+    const Expr* expr) {
+  Rectangle rect = context_get_clip(ctx);
+  FillStyle fill_style;
+  StrokeStyle stroke_style;
+  stroke_style.line_width = from_pt(1);
+
+  /* read arguments */
+  auto config_rc = expr_walk_map_with_defaults(expr_next(expr), ctx->defaults, {
+    {
+      "color",
+      expr_calln_fn({
+        bind(&color_read, ctx, _1, &stroke_style.color),
+        bind(&fill_style_read_solid, ctx, _1, &fill_style),
+      })
+    },
+    {"fill", bind(&fill_style_read, ctx, _1, &fill_style)},
+    {"stroke-color", bind(&color_read, ctx, _1, &stroke_style.color)},
+    {"stroke-width", bind(&measure_read, _1, &stroke_style.line_width)},
+    {"stroke-style", bind(&stroke_style_read, ctx, _1, &stroke_style)},
+  });
+
+  if (!config_rc) {
+    return config_rc;
+  }
+
+  Path p;
+  path_add_rectangle(&p, rect);
+  draw_path(ctx, p, stroke_style, fill_style);
+
+  return OK;
+}
+
+} // namespace clip::draw
+

src/draw/rectangle.h

@@ -0,0 +1,24 @@
+/**
+ * This file is part of the "clip" project
+ *   Copyright (c) 2020 Paul Asmuth
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+#include "context.h"
+
+namespace clip::draw {
+
+ReturnCode rectangle(
+    Context* ctx,
+    const Expr* expr);
+
+} // namespace clip::elements::plot::points
+

src/graphics/draw.cc

@@ -21,6 +21,11 @@ void draw_polygon(
     const Poly2& poly,
     StrokeStyle stroke_style,
     FillStyle fill_style) {
+  convert_unit_typographic(
+      ctx->dpi,
+      ctx->font_size,
+      &stroke_style.line_width);
+
   draw_cmd::Polygon elem;
   elem.poly = poly;
   elem.stroke_style = stroke_style;