現在、アプリで画面に描画しています。ユーザーは自分の家の部屋を表す長方形を描くことができますが、現在は最初のスペースに制限されています。
画面を、ユーザーが描画中にスクロール、ズームなどできるはるかに大きなキャンバスへの単純な「ウィンドウ」にする最良の方法は何ですか? (「描画」タッチモードと「移動」タッチモードが必要だと思います)
また、キャンバスはカスタム View クラスです。
class HomerView extends View { // the custom View for drawing on
// set up Bitmap, canvas, path and paint
private Bitmap myBitmap; // the initial image we turn into our canvas
private Canvas myCanvas; // the canvas we are drawing on
private Rect myRect; // the mathematical path of the lines we draw
private Paint myBitmapPaint; // the paint we use to draw the bitmap
// get the width of the entire tablet screen
private int screenWidth = getContext().getResources()
.getDisplayMetrics().widthPixels;
// get the height of the entire tablet screen
private int screenHeight = getContext().getResources()
.getDisplayMetrics().heightPixels;
public HomerView(Context context) { // constructor of HomerView
super(context);
myBitmap = Bitmap.createBitmap(screenWidth, screenHeight,
Bitmap.Config.ARGB_8888); // set our drawable space - the bitmap which becomes the canvas we draw on
myCanvas = new Canvas(myBitmap); // set our canvas to our bitmap which we just set up
myRect = new Rect(); // make a new rect
myBitmapPaint = new Paint(Paint.DITHER_FLAG); // set dither to ON in our saved drawing - gives better color interaction
}
protected void onDraw(Canvas canvas) { // method used when we want to draw something to our canvas
canvas.drawColor(Color.TRANSPARENT); // sets canvas colour
canvas.drawBitmap(myBitmap, 0, 0, myBitmapPaint); // save the canvas to bitmap - the numbers are the x, y coords we are drawing from
canvas.drawRect(myRect, myPaint); // draw the rectangle that the user has drawn using the paint we set up
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) { // if screen size changes, alter the bitmap size
super.onSizeChanged(w, h, oldw, oldh);
/*myBitmap = Bitmap.createBitmap(screenWidth, screenHeight,
Bitmap.Config.ARGB_8888);
myCanvas = new Canvas(myBitmap);*/
}
public void drawApplianceIcon() {
myCanvas.drawBitmap(bmp, iX - 50, iY - 50, myBitmapPaint);
makeToast("Lamp Drawn To Canvas");
}
// these variables are needed in touch listening
private int mX, mY, iX, iY; // current x,y and initial x,y
private static final float TOUCH_TOLERANCE = 4;
private void touch_start {} // touch methods
private void touch_move {}
private void touch_up {}
これは onCreate で次のように宣言されます。
View drawingAreaView = new HomerView(this);
setContentView(drawingAreaView);
スクロール可能なウィンドウになるようにコードを調整するにはどうすればよいですか?