clean up single-view version of cocoatea

cocoatea/meter.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <AppKit/AppKit.h>
+
+#include "view.h"
+
+struct Meter {
+	double x;
+	double y;
+	double width;
+	double height;
+	double r;
+	double g;
+	double b;
+	double a;
+	double level;
+	NSView* view;
+
+	Meter (NSView* view, double ax, double ay, double aw, double ah, double ar, double ag, double ab, double aa);
+
+	void set_level (double);
+	void draw (CGContextRef);
+};

cocoatea/meter.mm

@@ -0,0 +1,44 @@
+/* -*- c++ -*- */
+#include "meter.h"
+#include "view.h"
+
+Meter::Meter (NSView* v, double ax, double ay, double aw, double ah, double ar, double ag, double ab, double aa)
+	: x (ax)
+	, y (ay)
+	, width (aw)
+	, height (ah)
+	, r (ar)
+	, g (ag)
+	, b (ab)
+	, a (aa)
+	, level (0.)
+	, view (v)
+{
+}
+
+void
+Meter::draw (CGContextRef cg)
+{
+	NSRect bbox = NSMakeRect (x, y, width, height);
+
+	if (! [view needsToDrawRect:bbox]) {
+		return;
+	}
+
+	CGContextSetRGBStrokeColor (cg, 1., 1., 1., 1.);
+	CGContextStrokeRect (cg, NSMakeRect (x, y, width, height));
+
+	CGContextSetRGBFillColor (cg, r, g, b, a);
+	double fill_height = height - (height * level);
+	CGContextFillRect (cg, NSMakeRect (x, y + fill_height, width, height - fill_height));
+
+	CGContextSetRGBFillColor (cg, 0, 0., 0., 1.0);
+	CGContextFillRect (cg, NSMakeRect (x, y, width, fill_height));
+}
+
+void
+Meter::set_level (double f)
+{
+	level = f;
+	[view setNeedsDisplayInRect:NSMakeRect (x, y, width, height)];
+}

cocoatea/view.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #include <AppKit/AppKit.h>
 
 @interface CTView : NSView