如何让一个演员呆在舞台里？
如何让一个演员呆在舞台里？
提问于 2016-01-14 15:57:00
我正在用libgdx创建一个游戏，我用舞台和演员来制作游戏中的实体。但问题是我不能让演员呆在舞台或银幕里。当我把演员拖到最低、最高、最左或最右边的屏幕上时，它就会从屏幕上消失。我要它留在屏幕里。
我该怎么办？请帮帮忙。
这是我用来拖动我的演员的代码片段。
addListener(新的DragListener(){ @重写公共布尔型touchDown(InputEvent事件，浮点数x，浮点数y，int指针，int按钮)){ camera.unproject(dimension.set(x，y，0))；System.out.println("clicked "+ x+，“+y”)；返回true；}@覆盖公共空touchDragged(InputEvent事件，浮点数x，浮点数y，int指针){ moveBy(x-(getWidth()/2)，y-(getHeight()/3))；}@覆盖公共super.touchUp(InputEvent事件，浮点数x，浮点数y，int指针，int按钮){super.touchUp(事件，x，y，指针，按钮)；}}；}；
回答 1
Stack Overflow用户
发布于 2016-01-18 00:14:28
Stage确实有getWidth和getHeight方法。它们返回由内部Viewport管理的世界大小。Window类具有可选的拖动行为和keepWithinStage参数。
这是来自LibGDX 1.8.0 (Window类)的代码片段：
public void touchDragged (InputEvent event, float x, float y, int pointer) {
if (!dragging) return;
float width = getWidth(), height = getHeight();
float windowX = getX(), windowY = getY();
float minWidth = getMinWidth(), maxWidth = getMaxWidth();
float minHeight = getMinHeight(), maxHeight = getMaxHeight();
Stage stage = getStage();
boolean clampPosition = keepWithinStage && getParent() == stage.getRoot();
if ((edge & MOVE) != 0) {
float amountX = x - startX, amountY = y - startY;
windowX += amountX;
windowY += amountY;
}
if ((edge & Align.left) != 0) {
float amountX = x - startX;
if (width - amountX < minWidth) amountX = -(minWidth - width);
if (clampPosition && windowX + amountX < 0) amountX = -windowX;
width -= amountX;
windowX += amountX;
}
if ((edge & Align.bottom) != 0) {
float amountY = y - startY;
if (height - amountY < minHeight) amountY = -(minHeight - height);
if (clampPosition && windowY + amountY < 0) amountY = -windowY;
height -= amountY;
windowY += amountY;
}
if ((edge & Align.right) != 0) {
float amountX = x - lastX;
if (width + amountX < minWidth) amountX = minWidth - width;
if (clampPosition && windowX + width + amountX > stage.getWidth()) amountX = stage.getWidth() - windowX - width;
width += amountX;
}
if ((edge & Align.top) != 0) {
float amountY = y - lastY;
if (height + amountY < minHeight) amountY = minHeight - height;
if (clampPosition && windowY + height + amountY > stage.getHeight())
amountY = stage.getHeight() - windowY - height;
height += amountY;
}
lastX = x;
lastY = y;
setBounds(Math.round(windowX), Math.round(windowY), Math.round(width), Math.round(height));
}您可以通过将X夹紧到0和stage.getWidth() - actor.getWidth()来简化这一点，并为Y做同样的操作。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/34793994
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