java - Trying to get the x, y coordinate of each random circle that is drawn in android -
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i making game create random circles on screen. circles created randomly have value red or green.
my question able not determine when user clicks on 1 of circles determine circle have clicked on (red or green). main problem trying find x , y of circle drawn.
here code:
public class drawingview extends view { public drawingview(context context) { super(context); // todo auto-generated constructor stub } rectf rectf = new rectf(0, 0, 200, 0); private static final int w = 100; public static int lastcolor = color.black; private final random random = new random(); private final paint paint = new paint(); private final int radius = 230; private final handler handler = new handler(); public static int redcolor = color.red; public static int greencolor = color.green; private final runnable updatecircle = new runnable() { @override public void run() { lastcolor = random.nextint(2) == 1 ? redcolor : greencolor; paint.setcolor(lastcolor); invalidate(); handler.postdelayed(this, 1000); } }; @override protected void onattachedtowindow() { super.onattachedtowindow(); handler.post(updatecircle); } @override protected void ondetachedfromwindow() { super.ondetachedfromwindow(); handler.removecallbacks(updatecircle); } @override protected void ondraw(canvas canvas) { super.ondraw(canvas); // other stuff here // code below works when here float randomwidth =(int) (random.nextint(math.abs(getwidth()-radius/2)) + radius/2f); float randomheight = (random.nextint((int)math.abs((getheight()-radius/2 + radius/2f)))); canvas.drawcircle(randomwidth, randomheight + radius/2f, radius, paint); } @override public boolean ontouch(view v, motionevent event) { int x = event.getx(); int y = event.gety(); if(isinsidecircle(x, y)){ //do things here } return true; } private boolean isinsidecircle(int x, int y){ if (((x - randomwidth)^2 + (y - randomheight)^2) < radius^2) return true; return false; } } code below not work
public class drawingview extends view { public drawingview(context context) { super(context); // todo auto-generated constructor stub } rectf rectf = new rectf(0, 0, 200, 0); private static final int w = 100; public static int lastcolor = color.black; private final random random = new random(); private final paint paint = new paint(); private final int radius = 230; private final handler handler = new handler(); public static int redcolor = color.red; public static int greencolor = color.green; //its right below here code compiles perfectly, gets errors in logcat int randomwidth =(int) (random.nextint(math.abs(getwidth()-radius/2)) + radius/2f); int randomheight = (random.nextint((int)math.abs((getheight()-radius/2 + radius/2f)))); private final runnable updatecircle = new runnable() { @override public void run() { lastcolor = random.nextint(2) == 1 ? redcolor : greencolor; paint.setcolor(lastcolor); invalidate(); handler.postdelayed(this, 1000); } }; @override protected void onattachedtowindow() { super.onattachedtowindow(); handler.post(updatecircle); } @override protected void ondetachedfromwindow() { super.ondetachedfromwindow(); handler.removecallbacks(updatecircle); } @override protected void ondraw(canvas canvas) { super.ondraw(canvas); // other stuff here canvas.drawcircle(randomwidth, randomheight + radius/2f, radius, paint); } public boolean ontouch(view v, motionevent event) { int x = (int) event.getx(); int y = (int) event.gety(); if(isinsidecircle(x, y)){ //do things here } return true; } private boolean isinsidecircle(int x, int y){ if (((x - randomwidth)^2 + (y - randomheight)^2) < radius^2) return true; return false; } } here logcat
04-01 03:41:48.856: e/androidruntime(4010): fatal exception: main 04-01 03:41:48.856: e/androidruntime(4010): process: com.tripps.thesimplegame, pid: 4010 04-01 03:41:48.856: e/androidruntime(4010): java.lang.runtimeexception: unable start activity componentinfo{com.tripps.thesimplegame/com.tripps.thesimplegame.main}: java.lang.illegalargumentexception: n <= 0: 0 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activitythread.performlaunchactivity(activitythread.java:2298) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2360) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activitythread.access$800(activitythread.java:144) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activitythread$h.handlemessage(activitythread.java:1278) 04-01 03:41:48.856: e/androidruntime(4010): @ android.os.handler.dispatchmessage(handler.java:102) 04-01 03:41:48.856: e/androidruntime(4010): @ android.os.looper.loop(looper.java:135) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activitythread.main(activitythread.java:5221) 04-01 03:41:48.856: e/androidruntime(4010): @ java.lang.reflect.method.invoke(native method) 04-01 03:41:48.856: e/androidruntime(4010): @ java.lang.reflect.method.invoke(method.java:372) 04-01 03:41:48.856: e/androidruntime(4010): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899) 04-01 03:41:48.856: e/androidruntime(4010): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694) 04-01 03:41:48.856: e/androidruntime(4010): caused by: java.lang.illegalargumentexception: n <= 0: 0 04-01 03:41:48.856: e/androidruntime(4010): @ java.util.random.nextint(random.java:182) 04-01 03:41:48.856: e/androidruntime(4010): @ com.tripps.thesimplegame.drawingview.<init>(drawingview.java:38) 04-01 03:41:48.856: e/androidruntime(4010): @ com.tripps.thesimplegame.main.oncreate(main.java:30) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activity.performcreate(activity.java:5933) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1105) 04-01 03:41:48.856: e/androidruntime(4010): @ android.app.activitythread.performlaunchactivity(activitythread.java:2251) 04-01 03:41:48.856: e/androidruntime(4010): ... 10 more
what calling randomwidth , randomheight x , y cordinates of circle.
methods sign:
canvas.drawcircle(x, y, radius, paint); to check if user clicked inside circle can this:
public boolean ontouch(view v, motionevent event) { int x = (int)event.getx(); int y = (int)event.gety(); if(isinsidecircle(x, y)){ //do things here } return true; } private boolean isinsidecircle(int x, int y){ if (((x - center_x)^2 + (y - center_y)^2) < radius^2) return true; return false; } 
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