碰撞矩形方法

Question

我正试图在Bitmap的屏幕onTouch周围移动Rect。当然，我不希望图像消失，或者离开屏幕，所以我为屏幕的每一面，顶部和底部创建一个Rect。 我为我美丽的艺术作品道歉。

onTouch

@Override
public boolean onTouch(View v, MotionEvent event) {

    int x = (int) event.getX();
    int y = (int) event.getY();

    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:

            // Left Key Touched
            if (x <= bLeftRect.right && x >= bLeftRect.left
                    && y >= bLeftRect.top && y <= bLeftRect.bottom) {

                hero.setX(hero.getX() - tileDimen);
                heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);
                if (heroRect.intersect(wallTopRect)) {
                    hero.setX(hero.getX() + tileDimen);
                } else if (heroRect.intersect(wallLeftRect)) {
                    hero.setX(hero.getX() + tileDimen);
                }

                //etc....

是否有更好的方法，因为我将有更多需要碰撞的对象。我在考虑创建1“外围”Rect：

//Right key touched
if (perimeterRect.contains(heroRect)) {
                    hero.setX(hero.getX() + tileDimen);
                 } else {
                  //do nothing (collision) 
                 }

这会是一种更好的方法吗？非常感谢任何建议/见解。

谢谢，

马特

Answer 1

想出来：   检查heroRect是否在每个MotionEvent的perimeterRect内部更简单，如果heroRect位于周边内部，则检查heroRect是否与任何其他Rect碰撞

我的onTouch方法：

@Override
public boolean onTouch(View v, MotionEvent event) {

    int x = (int) event.getX();
    int y = (int) event.getY();

    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:

            // Left Key Touched
            if (x <= bLeftRect.right && x >= bLeftRect.left
                    && y >= bLeftRect.top && y <= bLeftRect.bottom) {

                hero.setX(hero.getX() - tileDimen);
                heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);

                if (!(perimeterRect.contains(heroRect))) {
                    hero.setX(hero.getX() + tileDimen);
                    heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);
                } //else if hero collides with other Rects... {
                // }

                // Up Key Touched
            } else if (x <= bUpRect.right && x >= bUpRect.left
                    && y >= bUpRect.top && y <= bUpRect.bottom) {

                hero.setY(hero.getY() - tileDimen);
                heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);

                if (!(perimeterRect.contains(heroRect))) {
                    hero.setY(hero.getY() + tileDimen);
                    heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);
                } //else if hero collides with other Rects... {
                // }

                // Right Key Touched
            } else if (x <= bRightRect.right && x >= bRightRect.left
                    && y >= bRightRect.top && y <= bRightRect.bottom) {

                hero.setX(hero.getX() + tileDimen);
                heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);

                if (!(perimeterRect.contains(heroRect))) {
                    hero.setX(hero.getX() - tileDimen);
                    heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);
                } //else if hero collides with other Rects... {
                // }

                // Down Key Touched
            } else if (x <= bDownRect.right && x >= bDownRect.left
                    && y >= bDownRect.top && y <= bDownRect.bottom) {

                hero.setY(hero.getY() + tileDimen);
                heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);

                if (!(perimeterRect.contains(heroRect))) {
                    hero.setY(hero.getY() - tileDimen);
                    heroRect.set(hero.getX(), hero.getY(), hero.getX() + tileDimen, hero.getY() + tileDimen);
                } //else if hero collides with other Rects... {
                // }

            } else {
                //button was not pressed, do nothing
            }

            break;
    }
    return true;
}

现在位图不会超过周长Rect：）