de.hems.trafficsim

Class Renderer

java.lang.Object

de.hems.trafficsim.Renderer

public class Renderer
extends java.lang.Object

User interface class rendering the track history on a SurfaceView.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	height height of the surface to draw to
protected android.view.SurfaceHolder	holder holder of the surface the renderer draws to
protected android.graphics.Paint	paint Paint instance of the renderer
protected int	pixelPerLine height of a rectangle representing one vehicle
protected int	pixelPerVehicle width of a rectangle representing one vehicle
protected float	tooShortPerHeight amount of pixels per height which are lost by rounding
protected float	tooShortPerTrackLength amount of pixels per track position which are lost by rounding
protected Track	track the track to render
protected int	width width of the surface to draw to

Constructor Summary

Constructors

Constructor and Description
Renderer(Track track, android.view.SurfaceHolder holder) Constuctor for a Renderer.

Method Summary

Modifier and Type	Method and Description
protected void	draw() Draws the current state of the track history to the Surface.
protected int	getColor(float curVelocity, float maxVelocity) Utility function which calculates a color from the relation between the current speed of a vehicle and it's maximum speed (from red over yellow to green).
void	setSize(int width, int height) Updates the dimension information of the renderer.
void	setTrack(Track track) Updates the track of the Surface.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

track

protected Track track

the track to render

pixelPerVehicle

protected int pixelPerVehicle

width of a rectangle representing one vehicle

pixelPerLine

protected int pixelPerLine

height of a rectangle representing one vehicle

tooShortPerTrackLength

protected float tooShortPerTrackLength

amount of pixels per track position which are lost by rounding

tooShortPerHeight

protected float tooShortPerHeight

amount of pixels per height which are lost by rounding

paint

protected android.graphics.Paint paint

Paint instance of the renderer

holder

protected android.view.SurfaceHolder holder

holder of the surface the renderer draws to

width

protected int width

width of the surface to draw to

height

protected int height

height of the surface to draw to

Constructor Detail

Renderer

public Renderer(Track track,
                android.view.SurfaceHolder holder)

Constuctor for a Renderer.

Parameters:

track - the track to render

holder - the holder of the surface to draw to

Method Detail

setSize

public void setSize(int width,
                    int height)

Updates the dimension information of the renderer.

Parameters:

width - the width of the SurfaceView

height - the height of the SurfaceView

setTrack

public void setTrack(Track track)

Updates the track of the Surface.

Parameters:

track - the new track to render

getColor

protected int getColor(float curVelocity,
                       float maxVelocity)

Utility function which calculates a color from the relation between the current speed of a vehicle and it's maximum speed (from red over yellow to green).

Parameters:

curVelocity - current velocity of the vehicle

maxVelocity - maximum velocity of the vehilce

Returns:

color encoded as Android color integer

draw

protected void draw()

Draws the current state of the track history to the Surface.