StageView.java

package x.y.z;

import android.content.Context;
import android.graphics.*;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by Benny de Leeuw on 13-11-14.
 * 
 * A Vertical Metro Line  O---O---O---O  (but than vertical...)
 * 
 */
public class StageView extends ImageView {

    public StageView(Context context) {
        super(context);
    }

    public StageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public StageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public boolean showTopLine = true;
    public boolean showBottomLine = true;

    public boolean isActive = false;

    public int activeStageColor = Color.GREEN;
    public int activeStageStrokeColor = Color.BLUE;
    public int activeStrokeSize = 10;


    public int inactiveStageColor = Color.LTGRAY;
    public int inactiveStageStrokeColor = Color.DKGRAY;
    public int inActiveStrokeSize = 10;

    public int lineColor = Color.DKGRAY;




    @Override
    protected void onDraw(Canvas canvas) {

        ScaleType scaleType = getScaleType();

        float radius = (float) this.getWidth() / 2f;
        float circleX = this.getWidth() / 2f;
        float circleY = this.getHeight() / 2f;

        if (scaleType == ScaleType.FIT_START) {
            circleY = radius;
        } else if (scaleType == ScaleType.FIT_END) {
            circleY = this.getHeight() - radius;
        }

        showTopLine &= (scaleType != ScaleType.FIT_START);
        showBottomLine &= (scaleType != ScaleType.FIT_END);

        float lineX = this.getWidth() / 2f;
        float lineStartY = showTopLine ? 0 : circleY;
        float lineStopY = showBottomLine ? this.getHeight() : circleY;

        Paint pLine = new Paint();
        pLine.setColor(lineColor);
        pLine.setAntiAlias(true);

        if (lineStartY != lineStopY) {
            canvas.drawRect(lineX - 10, lineStartY, lineX + 10, lineStopY, pLine);
        }

        int strokeSize = 0;

        if (!isActive && inActiveStrokeSize > 0) {
            Paint pStroke = new Paint();
            pStroke.setColor(inactiveStageStrokeColor);
            pStroke.setAntiAlias(true);
            canvas.drawCircle(circleX, circleY, radius, pStroke);
            strokeSize = inActiveStrokeSize;
        }

        if (isActive && activeStrokeSize > 0) {
            Paint pStroke = new Paint();
            pStroke.setColor(activeStageStrokeColor);
            pStroke.setAntiAlias(true);
            canvas.drawCircle(circleX, circleY, radius, pStroke);
            strokeSize = activeStrokeSize;
        }


        int stageColor = isActive ? activeStageColor : inactiveStageColor;

        Paint p = new Paint();
        p.setColor(stageColor);
        p.setAntiAlias(true);

        canvas.drawCircle(circleX, circleY, radius - strokeSize, p);

        super.onDraw(canvas);

    }
}