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101 lines
2.5 KiB
101 lines
2.5 KiB
package org.r3pek.pharmacies.widgets;
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import org.r3pek.pharmacies.R;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Matrix;
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import android.graphics.drawable.Drawable;
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import android.util.AttributeSet;
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import android.view.Display;
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import android.view.View;
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import android.view.WindowManager;
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public class Compass extends View implements ImageOrientationSensor {
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/* Orientation
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* 0 -> portrait
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* 1 -> landscape
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* 2 -> inverted portrait
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* 3 -> inverted landscape
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*/
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private final int orientationCompensation[] = {0, 90, 180, 270};
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private Context ctx;
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private float bearing;
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private float orientation;
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private Drawable needleBackgound;
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private Drawable needle;
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public Compass(Context context) {
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super(context);
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ctx = context;
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setDrawable();
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}
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public Compass(Context context, AttributeSet attrs) {
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super(context, attrs);
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ctx = context;
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setDrawable();
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}
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public Compass(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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ctx = context;
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setDrawable();
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}
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private void setDrawable() {
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needleBackgound = ctx.getResources().getDrawable(R.drawable.compass_background);
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needle = ctx.getResources().getDrawable(R.drawable.compass_needle);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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Display display = ((WindowManager)ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
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float rotation = bearing - orientation - orientationCompensation[display.getOrientation()] - 45;
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float keyPoints[] = {-4, 4, 4, -4};
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Matrix matrix = new Matrix();
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matrix.preRotate(rotation);
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matrix.mapPoints(keyPoints);
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float maxX, maxY;
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maxX = maxY = Float.MIN_VALUE;
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float minX, minY;
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minX = minY = Float.MAX_VALUE;
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for (int i = 0; i < keyPoints.length; i++) {
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if (i % 2 == 0) {
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if (maxX < keyPoints[i]) maxX = keyPoints[i];
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if (minX > keyPoints[i]) minX = keyPoints[i];
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} else {
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if (maxY < keyPoints[i]) maxY = keyPoints[i];
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if (minY > keyPoints[i]) minY = keyPoints[i];
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}
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}
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canvas.save();
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needleBackgound.setBounds(0, 0, 15, 15);
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needleBackgound.draw(canvas);
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canvas.translate((maxX + minX) / -2f, (maxY + minY) / -2f);
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canvas.rotate(rotation, 8, 8);
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needle.setBounds(0, 0, 15, 15);
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needle.draw(canvas);
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canvas.restore();
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}
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public void setBearing(float bearing) {
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this.bearing = bearing;
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}
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public void setOrientation(float orientation) {
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this.orientation = orientation;
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postInvalidate();
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}
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} |