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Class b2DebugDraw

Implement and register this class with a b2World to provide debug drawing of physics entities in your game.

example

Although Box2D is a physics engine and therefore has nothing to do with drawing, Box2dFlash provides such methods for debugging which are defined in the b2DebugDraw class. In Box2dWeb, a b2DebugDraw takes a canvas-context instead of a Sprite:

var debugDraw = new Box2D.Dynamics.b2DebugDraw();
debugDraw.SetSprite(document.GetElementsByTagName("canvas")[0].getContext("2d"));

Hierarchy

  • b2DebugDraw

Index

Constructors

Properties

Methods

Constructors

constructor

Properties

Static e_aabbBit

e_aabbBit: number

Draw axis aligned bounding boxes.

Static e_centerOfMassBit

e_centerOfMassBit: number

Draw center of mass frame.

Static e_controllerBit

e_controllerBit: number

Draw controllers.

Static e_jointBit

e_jointBit: number

Draw joint connections.

Static e_pairBit

e_pairBit: number

Draw broad-phase pairs.

Static e_shapeBit

e_shapeBit: number

Draw shapes.

Methods

AppendFlags

  • AppendFlags(flags: number): void

ClearFlags

  • ClearFlags(flags: number): void

DrawCircle

DrawPolygon

  • DrawPolygon(vertices: b2Vec2[], vertexCount: number, color: b2Color): void

  • Draw a closed polygon provided in CCW order.

    Parameters

    • vertices: b2Vec2[]

      Polygon verticies.

    • vertexCount: number

      Number of vertices in the polygon, usually vertices.length.

    • color: b2Color

      Polygon draw color.

    Returns void

DrawSegment

DrawSolidCircle

DrawSolidPolygon

  • DrawSolidPolygon(vertices: b2Vec2[], vertexCount: number, color: b2Color): void

  • Draw a solid closed polygon provided in CCW order.

    Parameters

    • vertices: b2Vec2[]

      Polygon verticies.

    • vertexCount: number

      Number of vertices in the polygon, usually vertices.length.

    • color: b2Color

      Polygon draw color.

    Returns void

DrawTransform

GetAlpha

  • GetAlpha(): number

GetDrawScale

  • GetDrawScale(): number

GetFillAlpha

  • GetFillAlpha(): number

GetFlags

  • GetFlags(): number

GetLineThickness

  • GetLineThickness(): number

GetSprite

  • GetSprite(): CanvasRenderingContext2D

  • Get the HTML Canvas Element for drawing.

    note

    box2dflash uses Sprite object, box2dweb uses CanvasRenderingContext2D, that is why this function is called GetSprite().

    Returns CanvasRenderingContext2D

    The HTML Canvas Element used for debug drawing.

GetXFormScale

  • GetXFormScale(): number

SetAlpha

  • SetAlpha(alpha: number): void

  • Set the alpha value used for lines.

    Parameters

    • alpha: number

      Alpha value for drawing lines.

    Returns void

SetDrawScale

  • SetDrawScale(drawScale: number): void

SetFillAlpha

  • SetFillAlpha(alpha: number): void

  • Set the alpha value used for fills.

    Parameters

    • alpha: number

      Alpha value for drawing fills.

    Returns void

SetFlags

  • SetFlags(flags: number): void

SetLineThickness

  • SetLineThickness(lineThickness: number): void

  • Set the line thickness.

    Parameters

    • lineThickness: number

      The new line thickness.

    Returns void

SetSprite

  • SetSprite(canvas: CanvasRenderingContext2D): void

  • Set the HTML Canvas Element for drawing.

    note

    box2dflash uses Sprite object, box2dweb uses CanvasRenderingContext2D, that is why this function is called SetSprite().

    Parameters

    • canvas: CanvasRenderingContext2D

      HTML Canvas Element to draw debug information to.

    Returns void

SetXFormScale

  • SetXFormScale(xformScale: number): void

  • Set the scale used for drawing XForms.

    Parameters

    • xformScale: number

      The transform scale.

    Returns void

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