mirror of
https://github.com/lxsang/Diya-API.git
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49 lines
1.1 KiB
Smalltalk
49 lines
1.1 KiB
Smalltalk
Class {
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#name : #DiyaConvexPolygon,
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#superclass : #DiyaPolygon,
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#category : #'Diya-Graphics'
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}
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{ #category : #accessing }
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DiyaConvexPolygon >> calculateVertices [
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|size index p texcoord|
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size := (points size + 1) << 2.
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vbuffer ifNotNil: [ vbuffer free ].
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vbuffer := FFIExternalArray externalNewType: GLfloat size:size.
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vbuffer autoRelease.
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points sort:[:a :b| a angle > b angle].
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index := 1.
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points do:[:point|
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texcoord := self texcoordOf: point.
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vbuffer
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at: index put: point x;
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at: index + 1 put: point y;
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at: index + 2 put: texcoord x;
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at: index + 3 put: texcoord y.
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index := index + 4.
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].
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p := points at: 2.
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texcoord := self texcoordOf: p.
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vbuffer
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at: index put: p x;
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at: index + 1 put: p y;
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at: index + 2 put: texcoord x;
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at: index + 3 put: texcoord y.
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]
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{ #category : #initialization }
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DiyaConvexPolygon >> drawLines [
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OpenGL drawArrays: GL_LINE_LOOP first:0 count: (vbuffer size >> 2) - 1.
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]
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{ #category : #initialization }
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DiyaConvexPolygon >> initialize [
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super initialize.
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type := GL_TRIANGLE_FAN
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]
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{ #category : #accessing }
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DiyaConvexPolygon >> texcoordOf: point [
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^ (point / (self extent )) asFloatPoint
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]
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