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Merge pull request #229 from lvlonggame/v3 

add Camera::project
This commit is contained in:
XiaoYang 2015-02-04 09:38:31 +08:00
parent 3eeeaf051f a0c7723edb
commit c9fe5251a9
2 changed files with 34 additions and 3 deletions
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20
cocos/2d/CCCamera.cpp
View File

@ -245,9 +245,27 @@ bool Camera::initOrthographic(float zoomX, float zoomY, float nearPlane, float f
return true; return true;
} }
void Camera::project(const Size& viewport, Vec3* src, Vec2* dst) const
{
GP_ASSERT(src);
GP_ASSERT(dst);
Vec4 clipPos;
getViewProjectionMatrix().transformVector(Vec4(src->x, src->y, src->z, 1.0f), &clipPos);
GP_ASSERT(clipPos.w != 0.0f);
float ndcX = clipPos.x / clipPos.w;
float ndcY = clipPos.y / clipPos.w;
dst->x = (ndcX + 1.0f) * 0.5f * viewport.width;
dst->y = (1.0f - (ndcY + 1.0f) * 0.5f) * viewport.height;
}
void Camera::unproject(const Size& viewport, Vec3* src, Vec3* dst) const void Camera::unproject(const Size& viewport, Vec3* src, Vec3* dst) const
{ {
assert(dst); GP_ASSERT(src);
GP_ASSERT(dst);
Vec4 screen(src->x / viewport.width, ((viewport.height - src->y)) / viewport.height, src->z, 1.0f); Vec4 screen(src->x / viewport.width, ((viewport.height - src->y)) / viewport.height, src->z, 1.0f);
screen.x = screen.x * 2.0f - 1.0f; screen.x = screen.x * 2.0f - 1.0f;
screen.y = screen.y * 2.0f - 1.0f; screen.y = screen.y * 2.0f - 1.0f;

17
cocos/2d/CCCamera.h
View File

@ -132,8 +132,21 @@ public:
const Mat4& getViewProjectionMatrix() const; const Mat4& getViewProjectionMatrix() const;
/** /**
* Convert the specified point of viewport from screenspace coordinate into the worldspace coordinate. * convert the specified point of viewport from world-space coordinates into the screen-space coordinates.
*/ *
* @param viewport The viewport size to use.
* @param src The world-space position.
* @param dst The screen-space position.
*/
void project(const Size& viewport, Vec3* src, Vec2* dst) const;
/**
* Convert the specified point of viewport from screen-space coordinate into the world-space coordinate.
*
* @param viewport The viewport size to use.
* @param src The screen-space position.
* @param dst The world-space position.
*/
void unproject(const Size& viewport, Vec3* src, Vec3* dst) const; void unproject(const Size& viewport, Vec3* src, Vec3* dst) const;
/** /**