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-/** CSci-4611 Assignment 6: Harold
- */
-
-#ifndef BILLBOARDS_H_
-#define BILLBOARDS_H_
-
-#include <mingfx.h>
-using namespace mingfx;
-
-#include "ground.h"
-
-/** Billboards are strokes planted in the ground that rotate automatically to
- face the viewer. This class holds the entire collection of billboard strokes.
- */
-class Billboards {
-public:
- Billboards();
- virtual ~Billboards();
-
- void Init(ShaderProgram *stroke3d_shaderprog);
-
- /// Projects a 2D normalized screen point (e.g., the mouse position in normalized
- /// device coordinates) to a 3D point on a plane defined by an "origin", which can
- /// really be any point coincident with the plane, and the plane normal. Returns
- /// true if the screen point projects onto the plane and stores the result in
- /// plane_point. Returns false if the screen point does not project onto the plane.
- bool ScreenPtHitsPlane(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
- const Point3 &plane_origin, const Vector3 &plane_normal,
- const Point2 &normalized_screen_pt, Point3 *plane_point);
-
-
- /// Checks to see if a ray starting at the eye point and passing through 2D
- /// normalized screen point projects onto any of the billboards in the scene. If
- /// so, returns the id of the closest billboard intersected. If not, returns -1.
- int IntersectBillboard(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
- const Point2 &normalized_screen_pt);
-
-
- /// Adds a new stroke as a billboard by projecting it onto a plane parallel
- /// to the filmplane that intersects with the anchor point, which should lie
- /// on the ground.
- void AddBillboardStroke(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
- const std::vector<Point2> &stroke2d, const Mesh &stroke2d_mesh,
- const Color &stroke_color, Ground *ground_ptr);
-
- /// Edits an existing billboard by adding an additional stroke to it.
- void AddToBillboard(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
- int billboard_id, const Mesh &stroke2d_mesh,
- const Color &stroke_color);
-
-
- /// Adjusts the transformation matrix used to draw each billboard so that the
- /// billboard will face the camera. Needs to be called each time the camera
- /// is moved within the scene.
- void UpdateBillboardRotations(const Point3 &current_eye_point);
-
-
- /// Draws all of the billboards
- void Draw(const Matrix4 &view_matrix, const Matrix4 &proj_matrix);
-
-private:
-
- // each billboard stores the following
- struct Billboard {
- Mesh mesh;
- Color color;
- Point3 anchor_pt;
- AABB bounding_box;
- Matrix4 transform;
- };
-
- // the array of all active billboards
- std::vector<Billboard> billboards_;
-
- ShaderProgram *stroke3d_shaderprog_;
-};
-
-#endif