processing.js で記述したアプリケーションにパンとズームを追加しようとしています。ここに私のコードがあります:
boolean surfaceTouchEvent(MotionEvent event) {
pointNum=event.getPointerCount();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
//User is pressing on finger
float x0=event.getX(0);
float y0=event.getY(0);
mode = false; //DRAG
break;
case MotionEvent.ACTION_POINTER_DOWN:
x1=event.getX(0);x2=event.getX(1);
y1=event.getY(0);y2=event.getY(1);
float z4 = dist(x1,y1,x2,y2);
mode = true; // pinch
break;
case MotionEvent.ACTION_POINTER_UP:
// User is released one of the fingers.
break;
case MotionEvent.ACTION_MOVE:
if (mode = false){
x1=event.getX(0)-x0;
y1=event.getY(0)-y0;
}
if (mode = true){
x1=event.getX(0);x2=event.getX(1);
y1=event.getY(0);y2=event.getY(1);
float z3 = dist(x1,y1,x2,y2);
if ( z3 > z4 ){
zoom += 0.1;
}
else if ( z3 < z4){
zoom -= 0.1;
}
}
break;
}
return super.surfaceTouchEvent(event);
}
ズームの場合は MotionEvent.ACTION_POINTER_DOWN 、パンの場合は MotionEvent.ACTION_DOWN の場合に備えて、古い位置を保存しました。たとえば、ズームで新しい距離と古い距離を比較するには、この古い位置が必要です
これはエラーです:
compile:
[javac] Compiling 2 source files to C:\DOCUME~1\T0P4568\LOCALS~1\Temp\android893850823480544580.pde\bin\classes
[javac] C:\DOCUME~1\T0P4568\LOCALS~1\Temp\android893850823480544580.pde\src\changethispackage\beforesubmitting\tothemarket\sketch_may28a\sketch_may28a.java:118: variable x0 might not have been initialized
[javac] x1=event.getX(0)-x0;
[javac] ^
[javac] C:\DOCUME~1\T0P4568\LOCALS~1\Temp\android893850823480544580.pde\src\changethispackage\beforesubmitting\tothemarket\sketch_may28a\sketch_may28a.java:119: variable y0 might not have been initialized
[javac] y1=event.getY(0)-y0;
[javac] ^
[javac] C:\DOCUME~1\T0P4568\LOCALS~1\Temp\android893850823480544580.pde\src\changethispackage\beforesubmitting\tothemarket\sketch_may28a\sketch_may28a.java:125: variable z4 might not have been initialized
[javac] if ( z3 > z4 ){
[javac] ^
[javac] 3 errors
助けてください!