Java FastMath.abs方法代碼示例

import com.jme3.math.FastMath; //導入方法依賴的package包/類
/**
 * <code>whichSide</code> takes a plane (typically provided by a view
 * frustum) to determine which side this bound is on.
 * 
 * @param plane
 *            the plane to check against.
 */
public Plane.Side whichSide(Plane plane) {
    float radius = FastMath.abs(xExtent * plane.getNormal().getX())
            + FastMath.abs(yExtent * plane.getNormal().getY())
            + FastMath.abs(zExtent * plane.getNormal().getZ());

    float distance = plane.pseudoDistance(center);

    //changed to < and > to prevent floating point precision problems
    if (distance < -radius) {
        return Plane.Side.Negative;
    } else if (distance > radius) {
        return Plane.Side.Positive;
    } else {
        return Plane.Side.None;
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
private float getMaxAxis(Vector3f scale) {
    float x = FastMath.abs(scale.x);
    float y = FastMath.abs(scale.y);
    float z = FastMath.abs(scale.z);

    if (x >= y) {
        if (x >= z) {
            return x;
        }
        return z;
    }

    if (y >= z) {
        return y;
    }

    return z;
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
protected void controlUpdate(final float tpf) {
    // check rotation
    final float rotation = spatial.getWorldRotation().toAngles(null)[1] * FastMath.RAD_TO_DEG;
    final float dist = FastMath.abs(direction.getAngle() - rotation);
    if (dist > 10f) {
        spatial.rotate(0f, direction.getRotation() * tpf * 15f, 0f);
    } else {
        spatial.lookAt(spatial.getWorldTranslation().add(0f, 0f, direction.getRotation()), Vector3f.UNIT_Y);
    }

    // get sprite and its control
    final AnimatedSprite animatedSprite = (AnimatedSprite) ((Node) spatial).getChild(0);
    final AnimatedSpriteControl animatedSpriteControl = animatedSprite.getControl(AnimatedSpriteControl.class);

    // handle 'halt'
    if (!up && !down && !right && !left) {
        animatedSpriteControl.setAnimation("idle");
        return;
    }

    // handle 'walk'
    animatedSpriteControl.setAnimation("walk");
    final Vector3f move = new Vector3f();
    if (up) {
        move.z = -1;
    }
    if (down) {
        move.z = 1;
    }
    if (right) {
        move.x = 1;
    }
    if (left) {
        move.x = -1;
    }
    if (!move.equals(Vector3f.ZERO)) {
        spatial.move(move.mult(tpf * 20f));
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
/**
 * This computes the "C" value in the geomipmapping paper.
 * See section "2.3.1.2 Pre-calculating d"
 * 
 * @param cam
 * @param pixelLimit
 * @return
 */
private float getCameraConstant(Camera cam, float pixelLimit){
    float n = cam.getFrustumNear();
    float t = FastMath.abs(cam.getFrustumTop());
    float A = n / t;
    float v_res = cam.getHeight();
    float T = (2f * pixelLimit) / v_res;
    return A / T;
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
/**
 * <code>transform</code> modifies the center of the box to reflect the
 * change made via a rotation, translation and scale.
 * 
 * @param trans 
 *            the transform to apply
 * @param store
 *            box to store result in
 */
public BoundingVolume transform(Transform trans, BoundingVolume store) {

    BoundingBox box;
    if (store == null || store.getType() != Type.AABB) {
        box = new BoundingBox();
    } else {
        box = (BoundingBox) store;
    }

    center.mult(trans.getScale(), box.center);
    trans.getRotation().mult(box.center, box.center);
    box.center.addLocal(trans.getTranslation());

    TempVars vars = TempVars.get();

    Matrix3f transMatrix = vars.tempMat3;
    transMatrix.set(trans.getRotation());
    // Make the rotation matrix all positive to get the maximum x/y/z extent
    transMatrix.absoluteLocal();

    Vector3f scale = trans.getScale();
    vars.vect1.set(xExtent * scale.x, yExtent * scale.y, zExtent * scale.z);
    transMatrix.mult(vars.vect1, vars.vect2);
    // Assign the biggest rotations after scales.
    box.xExtent = FastMath.abs(vars.vect2.getX());
    box.yExtent = FastMath.abs(vars.vect2.getY());
    box.zExtent = FastMath.abs(vars.vect2.getZ());

    vars.release();

    return box;
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
public void onTouch(String name, TouchEvent event, float tpf) {
    if (event.getType() == TouchEvent.Type.SCALE_MOVE && TOUCH_SCALE_EVENT.equals(name)) {
        
        float dss = event.getDeltaScaleSpan();
        // 縮放太小就不處理了，否則有可能兩個手指放上去時畫麵一直在抖動。
        if (FastMath.abs(dss) < 0.01f) {
            return;
        }

        // 縮放鏡頭: * 0.25 降低一點縮放強度
        zoomCamera(-dss * 0.1f);
        if (dss > 0) {
            // 拉近，放大 (參考：ChaseCamera中onAnalog方法)
            if (zoomin == false) {
                distanceLerpFactor = 0;
            }
            zoomin = true;
        } else {
            // 拉遠，縮小
            if (zoomin == true) {
                distanceLerpFactor = 0;
            }
            zoomin = false;
        }
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
public void onFling(TouchEvent evt) {
	if (flingEnabled && (evt.getDeltaY() > 0.2f || evt.getDeltaY() < -0.2f)) {
		if (!screen.getAnimManager().hasGameTimer(flingTimer)) {
			flingTimer.reset(false);
			flingDir = (evt.getDeltaY() < 0) ? true : false;
			flingSpeed = FastMath.abs(evt.getDeltaY());
			screen.getAnimManager().addGameTimer(flingTimer);
		}
	}
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
public void onResize(Vector3f oldScale, Vector3f newScale) {
    float x = FastMath.abs(newScale.x);
    float y = FastMath.abs(newScale.y);
    float z = FastMath.abs(newScale.z);

    light.setSpotRange(y);
    light.setSpotInnerAngle(x);
    light.setSpotOuterAngle(z);

    jmeLight.setValue("spotInnerAngle", light.getSpotInnerAngle());
    jmeLight.setValue("spotOuterAngle", light.getSpotOuterAngle());
    jmeLight.setValue("spotRange", light.getSpotRange());
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
/**
 * Helper Method to convert a Vector3f Scale into a radius. This is required,
 * because the Gizmos are scaled like regular jME Nodes.
 *
 * Note: In case of non-uniform scaling, the code picks the minimum or maximum
 * of all three components.
 * 
 * @param scale The Scale to convert
 * @return The Radius
 */
protected static float scaleToRadius(Vector3f scale) {
    final float eps = 0.0000125f;        
    float m;

    float x = FastMath.abs(scale.x);
    float y = FastMath.abs(scale.y);
    float z = FastMath.abs(scale.z);
    float max = Math.max(Math.max(x, y), z);
    float min = Math.min(Math.min(x, y), z);

    if (max - min <= eps) {
        // x == y == z
        m = x;
    } else {
        int nbMax = 0;
        if (max - x <= eps) {
            nbMax++;
        }
        if (max - y <= eps) {
            nbMax++;
        }
        if (max - z <= eps) {
            nbMax++;
        }
        if (nbMax >= 2) {
            m = min;
        } else {
            m = max;
        }
    }
    
    return m;
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
public boolean contains(Vector3f point) {
    return FastMath.abs(center.x - point.x) < xExtent
            && FastMath.abs(center.y - point.y) < yExtent
            && FastMath.abs(center.z - point.z) < zExtent;
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
public boolean intersects(Vector3f point) {
    return FastMath.abs(center.x - point.x) <= xExtent
            && FastMath.abs(center.y - point.y) <= yExtent
            && FastMath.abs(center.z - point.z) <= zExtent;
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
public void setMinMax(Vector3f min, Vector3f max) {
    this.center.set(max).addLocal(min).multLocal(0.5f);
    xExtent = FastMath.abs(max.x - center.x);
    yExtent = FastMath.abs(max.y - center.y);
    zExtent = FastMath.abs(max.z - center.z);
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
public void fireEvent(UI ui, boolean isPressed) {
        
        if (!ui.hasClickEvent() && !ui.hasDBClickEvent()) {
            return;
        }
        
        // 按下事件應該直接執行
        if (isPressed) {
            clickPressTime = LuoYing.getGameTime();
            lastCursorPosition.set(LuoYing.getCursorPosition());
            pressUI = ui;
            pressUI.fireClick(true);
            fireUIClickListener(pressUI, true, false);
            return;
        }
        
        // ==== 鼠標釋放時 ==== 
        
        // 1.如果鼠標放開時的UI與鼠標按下時的UI不一致，則忽略點擊
        if (ui != pressUI) {
            return;
        }
        
        // 2.當鼠標按下太久時,不認為是點擊或雙擊事件.
//        Logger.get(UIClickManager.class).log(Level.INFO, "click time={0}", (Common.getCurrentTime() - clickPressTime));
        if (LuoYing.getGameTime() - clickPressTime > clickPressTimeLimit) {
            return;
        }
        
        // 3.如果鼠標放開時的位置偏移過大，則忽略點擊
        Vector2f cursorPosition = LuoYing.getCursorPosition();
        float xMove = FastMath.abs(cursorPosition.x - lastCursorPosition.x);
        float yMove = FastMath.abs(cursorPosition.y - lastCursorPosition.y);
        if ((xMove > clickMoveLimit || yMove > clickMoveLimit)) {
            return;
        }
        
        // 4.如果是雙擊事件，則直接啟動(單擊事件需要延遲一定時間,以等待確認是否為雙擊，因為雙擊事件優先)
        if (releaseUI == ui && LuoYing.getGameTime() - clickReleaseTime <= dbclickLimit) {
            releaseUI.fireDBClick(isPressed);
            fireUIClickListener(releaseUI, isPressed, true);
            
            releaseUI = null;
            clickReleaseTime = 0;
            return;
        } 
        
        // 如果是單擊事件，則視情況:若該UI不存在雙擊事件，則直接執行單擊事件，
        // 否則延遲執行
        if (!ui.hasDBClickEvent()) {
            
            // 播放點擊聲效
            UISound.playClick(ui);
            ui.fireClick(false);
            fireUIClickListener(ui, false, false);
        } else {
            releaseUI = ui;
            clickReleaseTime = LuoYing.getGameTime();
        }

    }
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
private static boolean approxEqual(Vector2f u, Vector2f v) {
	float tolerance = 1E-4f;
	return (FastMath.abs(u.x - v.x) < tolerance) && (FastMath.abs(u.y - v.y) < tolerance);
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
    public void update(float tpf) {
        super.update(tpf);
        
        if (!enabled || !physicsEnabled) {
            return;
        }
        
        if (collisionChecker.getParent() == null) {
            if (target != null) {
                Spatial rootParent = getRoot(target);
                if (rootParent instanceof Node) {
                    ((Node) rootParent).attachChild(collisionChecker);
                }
            }
        }
        
        // 1.讓collisionChecker與相機位置保持一致.
        Vector3f loc = collisionChecker.getLocalTranslation();
        Vector3f camLoc = cam.getLocation();
        if (FastMath.abs(loc.x - camLoc.x) > 0.0001f 
                || FastMath.abs(loc.y - camLoc.y) > 0.0001f 
                || FastMath.abs(loc.z - camLoc.z) > 0.0001f) {
            collisionChecker.setLocalTranslation(cam.getLocation());
        }
        
        // 2.防止相機穿牆，當collisionTarget不為null時說明相機已經與某些物體發生碰撞，這時需要償試調整相機的位置。
        if (collisionTarget != null) {
//            LOG.log(Level.INFO, "CollisionChaseCamera, Need to fix collision with={0}", new Object[] {collisionTarget});

            // fixingCameraDistance方法用於拉近相機，以避免穿牆，這是一個持續的過程，如果該方法返回true,則說明正在持續
            // 修正（拉近）相機距離，這時不能釋放collisionTarget, 因為該方法的修正會在下一幀被ChaseCamera的默認行為重置，
            // 所以這個方法必須持續進行，直到相機不產生碰撞才能釋放。
            if (fixingCameraDistance(collisionTarget)) {
                collisionChecker.setLocalTranslation(cam.getLocation());
            } else {
                // 當該方法返回false時，說明相機已經不會碰撞到其它物體，則可
                // 釋放collisionTarget,即不再需要修正距離。
                collisionTarget = null;
            }
        }
    }