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rope distance API stuff

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cosmonaut 2021-09-30 13:10:28 -07:00
parent 0c0d1b67f5
commit 4a21f5eba8
2 changed files with 97 additions and 8 deletions
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86
src/Silkworm.c
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@ -1232,6 +1232,8 @@ double Silkworm_RopeAddNode(double ropeId, double xPosition, double yPosition, d
{
Silkworm_Rope *rope = LookupRope(ropeId);
if (rope != NULL)
{
double nodeId = Silkworm_CreateNode(xPosition, yPosition, rope->nodeMass, rope->friction, 1.0, rope->pushFactor);
rope->nodeIndices = realloc(rope->nodeIndices, sizeof(uint64_t) * (rope->nodeCount + 1));
@ -1245,6 +1247,90 @@ double Silkworm_RopeAddNode(double ropeId, double xPosition, double yPosition, d
return nodeId;
}
else
{
return -1;
}
}
double Silkworm_RopeVerticalLength(double ropeId)
{
Silkworm_Rope* rope = LookupRope(ropeId);
if (rope != NULL)
{
/* return the distance between the end node Y and the start Y */
return LookupNode(rope->nodeIndices[rope->nodeCount - 1])->position.y - LookupNode(rope->nodeIndices[0])->position.y;
}
else
{
return -1;
}
}
double Silkworm_NearestX(double ropeId, double xPosition, double yPosition)
{
uint32_t i;
float nearestSqrDistance, nearestX;
nearestSqrDistance = 9999999999.0f;
nearestX = 9999999999.0f;
Silkworm_Rope* rope = LookupRope(ropeId);
if (rope != NULL)
{
for (i = 0; i < rope->nodeCount; i += 1)
{
Silkworm_Node* node = LookupNode(rope->nodeIndices[i]);
float yDistance = node->position.y - yPosition;
float xDistance = node->position.x - xPosition;
float sqrDistance = xDistance * xDistance + yDistance * yDistance;
if (sqrDistance < nearestSqrDistance)
{
nearestSqrDistance = sqrDistance;
nearestX = node->position.x;
}
}
}
return nearestX;
}
double Silkworm_NearestY(double ropeId, double xPosition, double yPosition)
{
uint32_t i;
float nearestSqrDistance, nearestY;
nearestSqrDistance = 9999999999.0f;
nearestY = 9999999999.0f;
Silkworm_Rope* rope = LookupRope(ropeId);
if (rope != NULL)
{
for (i = 0; i < rope->nodeCount; i += 1)
{
Silkworm_Node* node = LookupNode(rope->nodeIndices[i]);
float yDistance = node->position.y - yPosition;
float xDistance = node->position.x - xPosition;
float sqrDistance = xDistance * xDistance + yDistance * yDistance;
if (sqrDistance < nearestSqrDistance)
{
nearestSqrDistance = sqrDistance;
nearestY = node->position.y;
}
}
}
return nearestY;
}
double Silkworm_RopeCreate(double xPosition, double yPosition, double mass, double friction, double windFactor, double pushFactor, double tearThreshold)
{

3
src/Silkworm.h
View File

@ -81,6 +81,9 @@ SILKWORMAPI double Silkworm_ClothFillTriangleBuffer(double clothId, double leftU
SILKWORMAPI double Silkworm_RopeCreate(double xPosition, double yPosition, double mass, double friction, double windFactor, double pushFactor, double tearThreshold);
SILKWORMAPI double Silkworm_RopeAddNode(double ropeId, double xPosition, double yPosition, double length);
SILKWORMAPI double Silkworm_RopeVerticalLength(double ropeId);
SILKWORMAPI double Silkworm_NearestX(double ropeId, double xPosition, double yPosition);
SILKWORMAPI double Silkworm_NearestY(double ropeId, double xPosition, double yPosition);
SILKWORMAPI void Silkworm_RopeDestroy(double ropeId);
SILKWORMAPI double Silkworm_RopeRequiredBufferSize(double ropeId);
SILKWORMAPI double Silkworm_RopeFillBuffer(double ropeId, double width, double leftUV, double widthUV, double topUV, double heightUV);