I figured out what the problem was. As you may not (or not know), the
(x,y) coordinate system on the Android screen is a little different.
The origin is in the top left corner, so therefore x increases across
to the right and y increases down to the bottom.
So instead of:
Java:
RectF clockRect = new RectF(86, 314, 394, 6);
It should have been:
Java:
RectF clockRect = new RectF(86, 6, 394, 314);
It all makes sense now.
On Feb 25, 6:21 pm, xspotlivin <dmbrown2...@gmail.com> wrote:
> I'm trying to create a customized clock that given certain input will
> highlight a certain section of the clock (e.g. draw pie shapes
> highlights on top of the clock).
>
> Here's my problem:
>
> I'm trying to usedrawArcin the Canvas class. I am able to draw 360
> degree arcs, but nothing shows up when I draw any arcs less than 360
> degree. I'd like to draw around 15 degree arcs, but when I put 15 into
> the sweep angle location, nothing gets drawn. It only draws full
> circles (360). Does anyone know what's wrong? Below is my code.
>
> ACTIVITY CLASS:
>
> import android.app.Activity;
> import android.content.pm.ActivityInfo;
> import android.os.Bundle;
> import android.view.Window;
> import android.view.WindowManager;
>
> public class AdherenceClock extends Activity {
>
> private ClockView clockView = null;
> public Document xml = null;
>
> /** Called when the activity is first created. */
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
>
> this.clockView = new ClockView(this);
>
> //Remove the title bar, set to full screen, and set to
> landscrape
> this.requestWindowFeature(Window.FEATURE_NO_TITLE);
> this.getWindow().setFlags
> (WindowManager.LayoutParams.FLAG_FULLSCREEN,
> WindowManager.LayoutParams.FLAG_FULLSCREEN);
> setRequestedOrientation
> (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
>
> setContentView(this.clockView);
> }
>
> }
>
> CLOCKVIEW CLASS:
>
> package nmm.android.adherenceclock;
>
> import android.content.Context;
> import android.graphics.Canvas;
> import android.graphics.Paint;
> import android.graphics.RectF;
> import android.view.View;
>
> public class ClockView extends View {
>
> protected final Paint pmColor = new Paint();
> protected final Paint amColor = new Paint();
>
> public ClockView(Context context) {
> super(context);
>
> this.setBackgroundDrawable(getResources().getDrawable
> (R.drawable.clockbackground));
>
> this.amColor.setARGB(100, 248, 225, 110);
> this.pmColor.setARGB(100, 111, 162, 214);
> }
>
> @Override
> protected void onDraw(Canvas canvas) {
>
> RectF clockRect = new RectF(86, 314, 394, 6);
> canvas.drawArc(clockRect, 0, 20, true, this.amColor);
> }
>
> }
>
> This doesn't work. It only works for 360 degrees. What's wrong?
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