package cn.bhc.drawline;import java.util.List;import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;public class DrawLineTestActivity extends MapActivity {
private MapView mapView;
private List <Overlay> mapOverlays;
private Projection projection;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true); mapOverlays = mapView.getOverlays();
projection = mapView.getProjection();
mapOverlays.add(new MyOverlay());
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class MyOverlay extends Overlay{ public MyOverlay(){ } public void draw(Canvas canvas, MapView mapv, boolean shadow){
super.draw(canvas, mapv, shadow); Paint mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(2); GeoPoint gP1 = new GeoPoint(19240000,-99120000);
GeoPoint gP2 = new GeoPoint(37423157, -122085008);
GeoPoint gP3=new GeoPoint(37500000, -14000000);
GeoPoint gp4=new GeoPoint(38500005, -16005555);
Point p1 = new Point();
Point p2 = new Point();
Point p3=new Point();
Point p4=new Point();
Path path = new Path(); projection.toPixels(gP1, p1);
projection.toPixels(gP2, p2);
projection.toPixels(gP3, p3);
projection.toPixels(gp4, p4);
path.moveTo(p2.x, p2.y);
path.lineTo(p1.x,p1.y);
path.moveTo(p1.x, p1.y);
path.lineTo(p3.x, p3.y);
path.moveTo(p3.x, p3.y);
path.lineTo(p4.x,p4.y);
canvas.drawPath(path, mPaint);
path.moveTo(p2.x, p2.y);
Bitmap bitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.flag)).getBitmap();
canvas.drawBitmap(bitmap, p2.x, p2.y,mPaint);
}
}
}
问题:
1.问什么我画出的线左右来回拖动就会变形了,不是固定的??
2.为什么我在地图上p2处画的那个图标老是显示不到p2处,我把p2换成其他三个点,同样也显示不到正确的位置,这是怎么回事,请高手们给我解答下啊,谢谢了,很迷惑也很急啊!!!
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;public class DrawLineTestActivity extends MapActivity {
private MapView mapView;
private List <Overlay> mapOverlays;
private Projection projection;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true); mapOverlays = mapView.getOverlays();
projection = mapView.getProjection();
mapOverlays.add(new MyOverlay());
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class MyOverlay extends Overlay{ public MyOverlay(){ } public void draw(Canvas canvas, MapView mapv, boolean shadow){
super.draw(canvas, mapv, shadow); Paint mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(2); GeoPoint gP1 = new GeoPoint(19240000,-99120000);
GeoPoint gP2 = new GeoPoint(37423157, -122085008);
GeoPoint gP3=new GeoPoint(37500000, -14000000);
GeoPoint gp4=new GeoPoint(38500005, -16005555);
Point p1 = new Point();
Point p2 = new Point();
Point p3=new Point();
Point p4=new Point();
Path path = new Path(); projection.toPixels(gP1, p1);
projection.toPixels(gP2, p2);
projection.toPixels(gP3, p3);
projection.toPixels(gp4, p4);
path.moveTo(p2.x, p2.y);
path.lineTo(p1.x,p1.y);
path.moveTo(p1.x, p1.y);
path.lineTo(p3.x, p3.y);
path.moveTo(p3.x, p3.y);
path.lineTo(p4.x,p4.y);
canvas.drawPath(path, mPaint);
path.moveTo(p2.x, p2.y);
Bitmap bitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.flag)).getBitmap();
canvas.drawBitmap(bitmap, p2.x, p2.y,mPaint);
}
}
}
问题:
1.问什么我画出的线左右来回拖动就会变形了,不是固定的??
2.为什么我在地图上p2处画的那个图标老是显示不到p2处,我把p2换成其他三个点,同样也显示不到正确的位置,这是怎么回事,请高手们给我解答下啊,谢谢了,很迷惑也很急啊!!!
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2.显示不到P2点上,因为绘制的图片的左上角为你所给的点,所以貌似没有到正确的位置,你放大到最大,看下,是不是这样,可以计算下img的宽高来让它显示在中央位置。