Patch by Artur Wyszynski:

* Implemented BGradient, BGradientLinear, BGradientRadial,
  BGradientDiamond, BGradientConic and BGradientRadialFocus
  new Interface Kit classes.
* Implemented all the (AGG-based) backend necessary in
  the app_server to render gradients (Painter, DrawingEngine)
* app_server/View can convert a BGradient layout to screen
  coordinates.
* Added BGradient methods of the Fill* methods in BView.
* Implemented a test app and added it to the image as a
  demo.
* Adopted Icon-O-Matic and libs/icon in order to avoid
  clashing with the new BGradient class. Re-use some
  parts where possible.

Awesome work, Artur! Thanks a lot. Now a more modern
looking GUI has just become much easier to implement! :-)

TODO:
* Remove the need to have gradient type twice in the
  app_server protocol.
* Refactor some parts of the patch to remove duplicated
  code (Painter, DrawingEngine).
* Adopt the BPicture protocol to know about BGradients.
* Review some parts of the BArchivable implementation.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28109 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/GradientLinear.cpp

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2006-2008, Haiku.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Artur Wyszynski <[email protected]>
+ */
+
+#include <Point.h>
+#include <Gradient.h>
+#include <GradientLinear.h>
+
+
+// constructor
+BGradientLinear::BGradientLinear()
+{
+	fData.linear.x1 = 0.0f;
+	fData.linear.y1 = 0.0f;
+	fData.linear.x2 = 0.0f;
+	fData.linear.y2 = 0.0f;
+	fType = B_GRADIENT_LINEAR;
+}
+
+
+// constructor
+BGradientLinear::BGradientLinear(const BPoint& start, const BPoint& end)
+{
+	fData.linear.x1 = start.x;
+	fData.linear.y1 = start.y;
+	fData.linear.x2 = end.x;
+	fData.linear.y2 = end.y;
+	fType = B_GRADIENT_LINEAR;
+}
+
+
+// constructor
+BGradientLinear::BGradientLinear(float x1, float y1, float x2, float y2)
+{
+	fData.linear.x1 = x1;
+	fData.linear.y1 = y1;
+	fData.linear.x2 = x2;
+	fData.linear.y2 = y2;
+	fType = B_GRADIENT_LINEAR;
+}
+
+
+// Start
+BPoint
+BGradientLinear::Start() const
+{
+	return BPoint(fData.linear.x1, fData.linear.y1);
+}
+
+
+// SetStart
+void
+BGradientLinear::SetStart(const BPoint& start)
+{
+	fData.linear.x1 = start.x;
+	fData.linear.y1 = start.y;
+}
+
+
+// SetStart
+void
+BGradientLinear::SetStart(float x, float y)
+{
+	fData.linear.x1 = x;
+	fData.linear.y1 = y;
+}
+
+
+// End
+BPoint
+BGradientLinear::End() const
+{
+	return BPoint(fData.linear.x2, fData.linear.y2);
+}
+
+
+// SetEnd
+void
+BGradientLinear::SetEnd(const BPoint& end)
+{
+	fData.linear.x2 = end.x;
+	fData.linear.y2 = end.y;
+}
+
+
+// SetEnd
+void
+BGradientLinear::SetEnd(float x, float y)
+{
+	fData.linear.x2 = x;
+	fData.linear.y2 = y;
+}