better visualization and more comfortable editing of the Bitmap frame

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12740 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/servers/app/bitmap_drawing/main.cpp

@@ -46,6 +46,8 @@ class TestView : public BView {
 
  private:
 			void	_ResetRect();
+			void	_InvalidateBitmapRect(BRect r);
+			void	_DrawCross(BPoint where, rgb_color c);
 
 	BBitmap*		fBitmap;
 	BRect			fBitmapRect;
@@ -77,7 +79,7 @@ TestView::MessageReceived(BMessage* message)
 	if (message->what == MSG_RESET) {
 		BRect old = fBitmapRect;
 		_ResetRect();
-		Invalidate(old | fBitmapRect);
+		_InvalidateBitmapRect(old | fBitmapRect);
 	} else
 		BView::MessageReceived(message);
 }
@@ -89,18 +91,70 @@ TestView::Draw(BRect updateRect)
 	SetDrawingMode(B_OP_COPY);
 	DrawBitmap(fBitmap, fBitmap->Bounds(), fBitmapRect);
 
+	// indicate the frame to see any errors in the drawing code
+	rgb_color red = (rgb_color){ 255, 0, 0, 255 };
+	_DrawCross(fBitmapRect.LeftTop() + BPoint(-1.0, -1.0), red);
+	_DrawCross(fBitmapRect.RightTop() + BPoint(1.0, -1.0), red);
+	_DrawCross(fBitmapRect.LeftBottom() + BPoint(-1.0, 1.0), red);
+	_DrawCross(fBitmapRect.RightBottom() + BPoint(1.0, 1.0), red);
+
 	// text
-	SetDrawingMode(B_OP_OVER);
+	SetDrawingMode(B_OP_ALPHA);
-	SetHighColor(0, 0, 0, 255);
+	const char* message = "Click and drag to move and resize the bitmap!";
-	const char* message = "Click and drag to move the bitmap!";
+	BPoint textPos(20.0, 30.0);
-	DrawString(message, BPoint(20.0, 30.0));
+	SetHighColor(255, 255, 255, 180);
+	DrawString(message, textPos);
+	SetHighColor(0, 0, 0, 180);
+	DrawString(message, textPos + BPoint(-1.0, -1.0));
+}
+
+bool
+hit_test(BPoint where, BPoint p)
+{
+	BRect r(p, p);
+	r.InsetBy(-7.0, -7.0);
+	return r.Contains(where);
+}
+
+bool
+hit_test(BPoint where, BPoint a, BPoint b)
+{
+	BRect r(a, b);
+	if (a.x == b.x)
+		r.InsetBy(-7.0, 0.0);
+	else
+		r.InsetBy(0.0, -7.0);
+	return r.Contains(where);
 }
 
 // MouseDown
 void
 TestView::MouseDown(BPoint where)
 {
-	fTracking = TRACKING_ALL;
+	fTracking = TRACKING_NONE;
+
+	// check if we hit a corner
+	if (hit_test(where, fBitmapRect.LeftTop()))
+		fTracking = TRACKING_LEFT_TOP;
+	else if (hit_test(where, fBitmapRect.RightTop()))
+		fTracking = TRACKING_RIGHT_TOP;
+	else if (hit_test(where, fBitmapRect.LeftBottom()))
+		fTracking = TRACKING_LEFT_BOTTOM;
+	else if (hit_test(where, fBitmapRect.RightBottom()))
+		fTracking = TRACKING_RIGHT_BOTTOM;
+	// check if we hit a side
+	else if (hit_test(where, fBitmapRect.LeftTop(), fBitmapRect.RightTop()))
+		fTracking = TRACKING_TOP;
+	else if (hit_test(where, fBitmapRect.LeftTop(), fBitmapRect.LeftBottom()))
+		fTracking = TRACKING_LEFT;
+	else if (hit_test(where, fBitmapRect.RightTop(), fBitmapRect.RightBottom()))
+		fTracking = TRACKING_RIGHT;
+	else if (hit_test(where, fBitmapRect.LeftBottom(), fBitmapRect.RightBottom()))
+		fTracking = TRACKING_BOTTOM;
+	// check if we hit inside the rect
+	else if (fBitmapRect.Contains(where))
+		fTracking = TRACKING_ALL;
+
 	fLastMousePos = where;
 }
 
@@ -117,15 +171,65 @@ TestView::MouseMoved(BPoint where, uint32 transit,
 					 const BMessage* dragMessage)
 {
 	if (fTracking > TRACKING_NONE) {
+		BRect old = fBitmapRect;
+		BPoint offset = where - fLastMousePos;
 		switch (fTracking) {
+			case TRACKING_LEFT_TOP:
+				fBitmapRect.Set(fBitmapRect.left + offset.x,
+								fBitmapRect.top + offset.y,
+								fBitmapRect.right,
+								fBitmapRect.bottom);
+				break;
+			case TRACKING_RIGHT_BOTTOM:
+				fBitmapRect.Set(fBitmapRect.left,
+								fBitmapRect.top,
+								fBitmapRect.right + offset.x,
+								fBitmapRect.bottom + offset.y);
+				break;
+			case TRACKING_LEFT_BOTTOM:
+				fBitmapRect.Set(fBitmapRect.left + offset.x,
+								fBitmapRect.top,
+								fBitmapRect.right,
+								fBitmapRect.bottom + offset.y);
+				break;
+			case TRACKING_RIGHT_TOP:
+				fBitmapRect.Set(fBitmapRect.left,
+								fBitmapRect.top + offset.y,
+								fBitmapRect.right + offset.x,
+								fBitmapRect.bottom);
+				break;
+			case TRACKING_LEFT:
+				fBitmapRect.Set(fBitmapRect.left + offset.x,
+								fBitmapRect.top,
+								fBitmapRect.right,
+								fBitmapRect.bottom);
+				break;
+			case TRACKING_TOP:
+				fBitmapRect.Set(fBitmapRect.left,
+								fBitmapRect.top + offset.y,
+								fBitmapRect.right,
+								fBitmapRect.bottom);
+				break;
+			case TRACKING_RIGHT:
+				fBitmapRect.Set(fBitmapRect.left,
+								fBitmapRect.top,
+								fBitmapRect.right + offset.x,
+								fBitmapRect.bottom);
+				break;
+			case TRACKING_BOTTOM:
+				fBitmapRect.Set(fBitmapRect.left,
+								fBitmapRect.top,
+								fBitmapRect.right,
+								fBitmapRect.bottom + offset.y);
+				break;
 			case TRACKING_ALL:
 			default:
-				BRect old = fBitmapRect;
+				fBitmapRect.OffsetBy(offset);
-				fBitmapRect.OffsetBy(where - fLastMousePos);
-				fLastMousePos = where;
-				Invalidate(old | fBitmapRect);
 				break;
 		}
+		fLastMousePos = where;
+		if (old != fBitmapRect)
+			_InvalidateBitmapRect(old | fBitmapRect);
 	}
 }
 
@@ -138,6 +242,30 @@ TestView::_ResetRect()
 						 floorf((Bounds().Height() - fBitmapRect.Height()) / 2.0 + 0.5));
 }
 
+// _InvalidateBitmapRect
+void
+TestView::_InvalidateBitmapRect(BRect r)
+{
+	r.InsetBy(-4.0, -4.0);
+	Invalidate(r);
+}
+
+// _DrawCross
+void
+TestView::_DrawCross(BPoint where, rgb_color c)
+{
+	BeginLineArray(4);
+		AddLine(BPoint(where.x, where.y - 3),
+				BPoint(where.x, where.y - 1), c);
+		AddLine(BPoint(where.x, where.y + 1),
+				BPoint(where.x, where.y + 3), c);
+		AddLine(BPoint(where.x - 3, where.y),
+				BPoint(where.x - 1, where.y), c);
+		AddLine(BPoint(where.x + 1, where.y),
+				BPoint(where.x + 3, where.y), c);
+	EndLineArray();
+}
+
 // show_window
 void
 show_window(BRect frame, const char* name)
@@ -152,7 +280,8 @@ show_window(BRect frame, const char* name)
 	window->AddChild(view);
 	BRect b(0.0, 0.0, 60.0, 15.0);
 	b.OffsetTo(5.0, view->Bounds().bottom - (b.Height() + 15.0));
-	BButton* control = new BButton(b, "button", "Reset", new BMessage(MSG_RESET));
+	BButton* control = new BButton(b, "button", "Reset", new BMessage(MSG_RESET),
+								   B_FOLLOW_LEFT | B_FOLLOW_BOTTOM);
 	view->AddChild(control);
 	control->SetTarget(view);
 
@@ -165,7 +294,7 @@ main(int argc, char** argv)
 {
 	BApplication* app = new BApplication("application/x.vnd-Haiku.BitmapDrawing");
 
-	BRect frame(50.0, 50.0, 300.0, 250.0);
+	BRect frame(50.0, 50.0, 400.0, 250.0);
 	show_window(frame, "Bitmap Drawing");
 
 	app->Run();