// Copyright (c) 2007, Rodrigo Braz Monteiro
// All rights reserved.
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/// @file visual_feature->cpp
/// @brief Feature on video the user can interact with using mouse
/// @ingroup visual_ts
///

#include "gl_wrap.h"
#include "visual_feature.h"

bool VisualDraggableFeature::IsMouseOver(Vector2D mouse_pos) const {
	if (!pos) return false;

	Vector2D delta = mouse_pos - pos;

	switch (type) {
		case DRAG_BIG_SQUARE:
			return fabs(delta.X()) < 6 && fabs(delta.Y()) < 6;

		case DRAG_BIG_CIRCLE:
			return delta.SquareLen() < 36;

		case DRAG_BIG_TRIANGLE: {
			if (delta.Y() < -10 || delta.Y() > 6) return false;
			float dy = delta.Y() - 6;
			return 16 * delta.X() + 9 * dy < 0 && 16 * delta.X() - 9 * dy > 0;
		}

		case DRAG_SMALL_SQUARE:
			return fabs(delta.X()) < 3 && fabs(delta.Y()) < 3;

		case DRAG_SMALL_CIRCLE:
			return delta.SquareLen() < 9;

		default:
			return false;
	}
}

void VisualDraggableFeature::Draw(OpenGLWrapper const& gl) const {
	if (!pos) return;

	switch (type) {
		case DRAG_BIG_SQUARE:
			gl.DrawRectangle(pos - 6, pos + 6);
			gl.DrawLine(pos - Vector2D(0, 12), pos + Vector2D(0, 12));
			gl.DrawLine(pos - Vector2D(12, 0), pos + Vector2D(12, 0));
			break;

		case DRAG_BIG_CIRCLE:
			gl.DrawCircle(pos, 6);
			gl.DrawLine(pos - Vector2D(0, 12), pos + Vector2D(0, 12));
			gl.DrawLine(pos - Vector2D(12, 0), pos + Vector2D(12, 0));
			break;

		case DRAG_BIG_TRIANGLE:
			gl.DrawTriangle(pos - Vector2D(9, 6), pos + Vector2D(9, -6), pos + Vector2D(0, 10));
			gl.DrawLine(pos, pos + Vector2D(0, -16));
			gl.DrawLine(pos, pos + Vector2D(-14, 8));
			gl.DrawLine(pos, pos + Vector2D(14, 8));
			break;

		case DRAG_SMALL_SQUARE:
			gl.DrawRectangle(pos - 3, pos + 3);
			break;

		case DRAG_SMALL_CIRCLE:
			gl.DrawCircle(pos, 3);
			break;
		default:
			break;
	}
}

void VisualDraggableFeature::StartDrag() {
	start = pos;
}

void VisualDraggableFeature::UpdateDrag(Vector2D d, bool single_axis) {
	if (single_axis)
		d = d.SingleAxis();

	pos = start + d;
}

bool VisualDraggableFeature::HasMoved() const {
	return pos != start;
}