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polyshape.go
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/
polyshape.go
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// Copyright 2014 The Azul3D Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cp
/*
#include "chipmunk/include/chipmunk/chipmunk.h"
*/
import "C"
import (
"unsafe"
)
// Allocate and initialize a polygon shape with rounded corners.
//
// A convex hull will be created from the vertexes.
func (b *Body) PolyShapeNew(verts []Vect, transform Transform, radius float64) *Shape {
s := new(Shape)
s.c = C.cpPolyShapeNew(
b.c,
C.int(len(verts)),
(*C.cpVect)(unsafe.Pointer(&verts[0])),
transform.c(),
C.cpFloat(radius),
)
if s.c == nil {
return nil
}
C.cpShapeSetUserData(s.c, C.cpDataPointer(unsafe.Pointer(s)))
return s
}
// Allocate and initialize a box shaped polygon shape.
func (b *Body) BoxShapeNew(width, height, radius float64) *Shape {
s := new(Shape)
s.c = C.cpBoxShapeNew(
b.c,
C.cpFloat(width),
C.cpFloat(height),
C.cpFloat(radius),
)
if s.c == nil {
return nil
}
C.cpShapeSetUserData(s.c, C.cpDataPointer(unsafe.Pointer(s)))
return s
}
// Allocate and initialize an offset box shaped polygon shape.
func (b *Body) BoxShapeNew2(box BB, radius float64) *Shape {
s := new(Shape)
s.c = C.cpBoxShapeNew2(b.c, box.c(), C.cpFloat(radius))
if s.c == nil {
return nil
}
C.cpShapeSetUserData(s.c, C.cpDataPointer(unsafe.Pointer(s)))
return s
}
// Get the number of verts in a polygon shape.
func (s *Shape) PolyCount() int {
return int(C.cpPolyShapeGetCount(s.c))
}
// Get the ith vertex of a polygon shape.
func (s *Shape) PolyVert(index int) Vect {
return goVect(C.cpPolyShapeGetVert(s.c, C.int(index)))
}
// Get the radius of a polygon shape.
func (s *Shape) PolyRadius() float64 {
return float64(C.cpPolyShapeGetRadius(s.c))
}