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#include "RenderableArrow.h"
#include "EntityNode.h"
namespace entity
{
RenderableArrow::RenderableArrow(EntityNode& node) :
_node(node),
_needsUpdate(true)
{}
void RenderableArrow::queueUpdate()
{
_needsUpdate = true;
}
void RenderableArrow::updateGeometry()
{
if (!_needsUpdate) return;
_needsUpdate = false;
// The starting point of the arrow is at the center of the entity's visible bounding box
auto origin = _node.getWorldPosition() + _node.localAABB().getOrigin();
const auto& direction = _node.getDirection();
auto colour = _node.getRenderState() == scene::INode::RenderState::Active ?
_node.getEntityColour() : INACTIVE_ENTITY_COLOUR;
Vector3 left(-direction.y(), direction.x(), 0);
// With arbitrary z rotation, left calculated this way is not guaranteed to be unit
left.normalise();
// If the direction is parallel to up, then should use a fixed left axis instead
if (math::isParallel(direction, g_vector3_axis_z))
{
left = g_vector3_axis_y;
}
Vector3 up = direction.cross(left);
Vector3 endpoint(origin + direction * 32.0);
Vector3 tip1(endpoint + direction * (-8.0) + up * (-4.0));
Vector3 tip2(tip1 + up * 8.0);
Vector3 tip3(endpoint + direction * (-8.0) + left * (-4.0));
Vector3 tip4(tip3 + left * 8.0);
std::vector<render::RenderVertex> vertices
{
render::RenderVertex(origin, {1,0,0}, {0,0}, colour),
render::RenderVertex(endpoint, {1,0,0}, {0,0}, colour),
render::RenderVertex(tip1, {1,0,0}, {0,0}, colour),
render::RenderVertex(tip2, {1,0,0}, {0,0}, colour),
render::RenderVertex(tip3, {1,0,0}, {0,0}, colour),
render::RenderVertex(tip4, {1,0,0}, {0,0}, colour),
};
// Indices are always the same, therefore constant
static const std::vector<unsigned int> Indices
{
0, 1, // origin to endpoint
1, 2, // endpoint to tip1
1, 3, // endpoint to tip2
1, 4, // endpoint to tip3
1, 5, // endpoint to tip4
2, 4, // tip1 to tip3
4, 3, // tip3 to tip2
3, 5, // tip2 to tip4
5, 2, // tip4 to tip1
};
updateGeometryWithData(render::GeometryType::Lines, vertices, Indices);
}
}
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