Android-Compass

package com.pass.compass ; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.graphics.*; import android.graphics.drawable.*; import android.view.*; import android.content.res.Resources; public class CompassView extends View{ private float bearing ; private Paint markerPaint ; private Paint textPaint ; private Paint circlePaint ; private String northString ; private String eastString ; private String southString ; private String westString ; private int textHeight ; public CompassView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub initCompassView(); } public CompassView(Context context) { super(context); // TODO Auto-generated constructor stub initCompassView(); } public CompassView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub initCompassView(); } protected void initCompassView() { // TODO Auto-generated method stub setFocusable(true); Resources r = this.getResources(); circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG); circlePaint.setColor(r.getColor(R.color.background_color)); circlePaint.setStrokeWidth(1); circlePaint.setStyle(Paint.Style.FILL_AND_STROKE); northString = r.getString(R.string.cardinal_north); eastString = r.getString(R.string.cardinal_east); southString = r.getString(R.string.cardinal_south); westString = r.getString(R.string.cardinal_west); textPaint = new Paint(Paint.ANTI_ALIAS_FLAG); textPaint.setColor(r.getColor(R.color.text_color)); textHeight = (int)textPaint.measureText("yY"); markerPaint = new Paint(Paint.ANTI_ALIAS_FLAG); markerPaint.setColor(r.getColor(R.color.marker_color)); } protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ int measuredWidth = measure(widthMeasureSpec); int measuredHeight = measure(heightMeasureSpec); int d = Math.min(measuredWidth, measuredHeight); setMeasuredDimension(d,d); } private int measure(int measureSpec) { // TODO Auto-generated method stub int result = 0 ; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); if(specMode == MeasureSpec.UNSPECIFIED){ } else{ result = specSize ; } return result; } public void setBearing(float _bearing){ bearing = _bearing ; } public float getBearing(){ return bearing ; } protected void onDraw(Canvas canvas){ int px = getMeasuredWidth()/2 ; int py = getMeasuredHeight()/2 ; int radius = Math.min(px, py); canvas.drawCircle(px, py, radius, circlePaint); canvas.save(); canvas.rotate(-bearing, px, py); int textWidth = (int)textPaint.measureText("W"); int cardinalX = px-textWidth/2 ; int cardinalY = py-radius+textHeight ; //姣忓崄浜斿害缁樺埗涓�釜鏍囪锛屾瘡45搴︾粯鍒朵竴涓枃鏈� for(int i = 0 ; i < 24 ; i++){ canvas.drawLine(px, py-radius, px, py-radius+10, markerPaint); canvas.save(); canvas.translate(0, textHeight); //缁樺埗鍩烘湰鏂逛綅 if(i%6 == 0){ String dirString = ""; switch(i){ case(0):{ dirString = northString ; int arrowY = 2*textHeight ; canvas.drawLine(px, arrowY, px-5, 3*textHeight, markerPaint); canvas.drawLine(px, arrowY, px+5, 3*textHeight, markerPaint); break ; } case(6):dirString = eastString ; break ; case(12):dirString = southString ; break ; case(18):dirString = westString ; break ; } canvas.drawText(dirString, cardinalX, cardinalY, textPaint); } else if(i%3 == 0){ String angle = String.valueOf(i*15); float angleTextWidth = textPaint.measureText(angle); int angleTextX = (int)(px-angleTextWidth/2); int angleTextY = py-radius+textHeight ; canvas.drawText(angle, angleTextX, angleTextY, textPaint); } canvas.restore(); canvas.rotate(15,px,px); } canvas.restore(); } }