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ADDED: GetWorldToScreenEx()

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Addressing issue #1056
This commit is contained in:
Ray 2020-01-24 18:54:53 +01:00
parent a3ca859db2
commit eee995ec3d
2 changed files with 44 additions and 35 deletions
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78
src/core.c
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@ -1522,45 +1522,53 @@ Matrix GetCameraMatrix2D(Camera2D camera)
// Returns the screen space position from a 3d world space position
Vector2 GetWorldToScreen(Vector3 position, Camera camera)
{
// Calculate projection matrix (from perspective instead of frustum
Matrix matProj = MatrixIdentity();
if (camera.type == CAMERA_PERSPECTIVE)
{
// Calculate projection matrix from perspective
matProj = MatrixPerspective(camera.fovy*DEG2RAD, ((double)GetScreenWidth()/(double)GetScreenHeight()), DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
}
else if (camera.type == CAMERA_ORTHOGRAPHIC)
{
float aspect = (float)screenWidth/(float)screenHeight;
double top = camera.fovy/2.0;
double right = top*aspect;
// Calculate projection matrix from orthographic
matProj = MatrixOrtho(-right, right, -top, top, 0.01, 1000.0);
}
// Calculate view matrix from camera look at (and transpose it)
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
// Convert world position vector to quaternion
Quaternion worldPos = { position.x, position.y, position.z, 1.0f };
// Transform world position to view
worldPos = QuaternionTransform(worldPos, matView);
// Transform result to projection (clip space position)
worldPos = QuaternionTransform(worldPos, matProj);
// Calculate normalized device coordinates (inverted y)
Vector3 ndcPos = { worldPos.x/worldPos.w, -worldPos.y/worldPos.w, worldPos.z/worldPos.w };
// Calculate 2d screen position vector
Vector2 screenPosition = { (ndcPos.x + 1.0f)/2.0f*(float)GetScreenWidth(), (ndcPos.y + 1.0f)/2.0f*(float)GetScreenHeight() };
Vector2 screenPosition = GetWorldToScreenEx(position, camera, GetScreenWidth(), GetScreenHeight());
return screenPosition;
}
// Returns size position for a 3d world space position (useful for texture drawing)
Vector2 GetWorldToScreenEx(Vector3 position, Camera camera, int width, int height)
{
// Calculate projection matrix (from perspective instead of frustum
Matrix matProj = MatrixIdentity();
if (camera.type == CAMERA_PERSPECTIVE)
{
// Calculate projection matrix from perspective
matProj = MatrixPerspective(camera.fovy * DEG2RAD, ((double)width/(double)height), DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
}
else if (camera.type == CAMERA_ORTHOGRAPHIC)
{
float aspect = (float)width/(float)height;
double top = camera.fovy/2.0;
double right = top*aspect;
// Calculate projection matrix from orthographic
matProj = MatrixOrtho(-right, right, -top, top, DEFAULT_NEAR_CULL_DISTANCE, DEFAULT_FAR_CULL_DISTANCE);
}
// Calculate view matrix from camera look at (and transpose it)
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
// Convert world position vector to quaternion
Quaternion worldPos = { position.x, position.y, position.z, 1.0f };
// Transform world position to view
worldPos = QuaternionTransform(worldPos, matView);
// Transform result to projection (clip space position)
worldPos = QuaternionTransform(worldPos, matProj);
// Calculate normalized device coordinates (inverted y)
Vector3 ndcPos = { worldPos.x/worldPos.w, -worldPos.y/worldPos.w, worldPos.z/worldPos.w };
// Calculate 2d screen position vector
Vector2 sizePosition = { (ndcPos.x + 1.0f)/2.0f*(float)width, (ndcPos.y + 1.0f)/2.0f*(float)height };
return sizePosition;
}
// Returns the screen space position for a 2d camera world space position
Vector2 GetWorldToScreen2D(Vector2 position, Camera2D camera)
{

1
src/raylib.h
View File

@ -920,6 +920,7 @@ RLAPI Ray GetMouseRay(Vector2 mousePosition, Camera camera); // Returns a r
RLAPI Matrix GetCameraMatrix(Camera camera); // Returns camera transform matrix (view matrix)
RLAPI Matrix GetCameraMatrix2D(Camera2D camera); // Returns camera 2d transform matrix
RLAPI Vector2 GetWorldToScreen(Vector3 position, Camera camera); // Returns the screen space position for a 3d world space position
RLAPI Vector2 GetWorldToScreenEx(Vector3 position, Camera camera, int width, int height); // Returns size position for a 3d world space position
RLAPI Vector2 GetWorldToScreen2D(Vector2 position, Camera2D camera); // Returns the screen space position for a 2d camera world space position
RLAPI Vector2 GetScreenToWorld2D(Vector2 position, Camera2D camera); // Returns the world space position for a 2d camera screen space position