Java FastMath.approximateEquals方法代碼示例

import com.jme3.math.FastMath; //導入方法依賴的package包/類
private void jSpinner1StateChanged(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_jSpinner1StateChanged
    // This is called, when the spinner of the near plane has been changed.
    float near = ((float)jSlider1.getValue() / 1000f);
    float spin = (Float)jSpinner1.getValue();
    
    // Prevent an endless loop of state changes and don't change the slider when the spinner
    // has gone out of range, since this would lead to the slider's StateChanged overwriting the spinner again.
    // but we want the spinner to be a free-form field
    
    if (spin <= 2000f && spin >= 100f && !FastMath.approximateEquals((Float)(jSpinner1.getValue()), near)) {
        jSlider1.setValue((int)((Float)(jSpinner1.getValue()) * 1000f));
    }
    
    final Camera cam = SceneApplication.getApplication().getCamera();
    cam.setFrustumPerspective(45f, (float)cam.getWidth() / cam.getHeight(), spin, cam.getFrustumFar());
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
private void jSlider1StateChanged(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_jSlider1StateChanged
    // This is called, when the slider of the near plane has been dragged.
    float near = ((float)jSlider1.getValue() / 1000f);
    
    // Prevent an endless loop of state changes
    if (!FastMath.approximateEquals((Float)(jSpinner1.getValue()), near)) {
        jSpinner1.setValue(near);
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
private void jSlider2StateChanged(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_jSlider2StateChanged
    // This is called, when the slider of the far plane has been dragged.
    float far = jSlider2.getValue();
    
    // Prevent an endless loop of state changes
    if (!FastMath.approximateEquals((Float)(jSpinner2.getValue()), far)) {
        jSpinner2.setValue(far);
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
private void jSpinner2StateChanged(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_jSpinner2StateChanged
    // Prevent an endless loop of state changes and don't change the slider when the spinner
    // has gone out of range, since this would lead to the slider's StateChanged overwriting the spinner again.
    // but we want the spinner to be a free-form field
    
    float spin = (Float)jSpinner2.getValue();
    if (spin <= 3000f && spin >= 5f && !FastMath.approximateEquals(spin, (float)jSlider2.getValue())) {
        jSlider2.setValue((int)spin);
    }
    
    final Camera cam = SceneApplication.getApplication().getCamera();
    cam.setFrustumPerspective(45f, (float)cam.getWidth() / cam.getHeight(), cam.getFrustumNear(), spin);
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
void tryParseShadowMapSize(PLSFVisualPanel1 comp) throws WizardValidationException {
    try {
        shadowMapSize = Integer.parseInt(comp.getjShadowMapField().getText());
    } catch (NumberFormatException nfe) {
        throw new WizardValidationException(comp, "NumberFormatException when trying to parse the ShadowMapSize!", null);
    }
    
    double log2 = Math.log(shadowMapSize) / Math.log(2);

    if (!FastMath.approximateEquals((float)(Math.floor(log2) - log2), 0f)) {
        LOG.warning("The Shadow Map Size is not power of two!");
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
void tryParseShadowMapSize(SLSFVisualPanel1 comp) throws WizardValidationException {
    try {
        shadowMapSize = Integer.parseInt(comp.getjShadowMapField().getText());
    } catch (NumberFormatException nfe) {
        throw new WizardValidationException(comp, "NumberFormatException when trying to parse the ShadowMapSize!", null);
    }
    
    double log2 = Math.log(shadowMapSize) / Math.log(2);

    if (!FastMath.approximateEquals((float)(Math.floor(log2) - log2), 0f)) {
        LOG.warning("The Shadow Map Size is not power of two!");
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
void tryParseShadowMapSize(DLSFVisualPanel1 comp) throws WizardValidationException {
    try {
        shadowMapSize = Integer.parseInt(comp.getjShadowMapField().getText());
    } catch (NumberFormatException nfe) {
        throw new WizardValidationException(comp, "NumberFormatException when trying to parse the ShadowMapSize!", null);
    }
    
    double log2 = Math.log(shadowMapSize) / Math.log(2);

    if (!FastMath.approximateEquals((float)(Math.floor(log2) - log2), 0f)) {
        LOG.warning("The Shadow Map Size is not power of two!");
    }
}
 

import com.jme3.math.FastMath; //導入方法依賴的package包/類
@Override
public void update() {
    //update the character state based on the needed components
    //first collect some necessary information
    PhysicsCharacter character = get(PhysicsCharacter.class);
    Vector2f move = get(PhysicsCharacterMovement.class).getDirection();
    set(new PhysicsCharacterMovementForce(new Vector3f(
            move.x*character.getMass()*character.getAcceleration(), 0,
            move.y*character.getMass()*character.getAcceleration())));
    float capsuleHeight = character.getHeight()-2*character.getRadius()-character.getStepHeight();
    float bodyHeight = capsuleHeight+2*character.getRadius();
    float jumpSpeed = FastMath.sqrt(2*9.81f*character.getJumpHeight());
    boolean jumping = get(PhysicsCharacterState.class).isJumping();
    boolean ducking = get(PhysicsCharacterState.class).isDucking();
    set(new PhysicsCharacterState(false, false)); //TODO remove
    int jumpCount = get(PhysicsCharacterJumpCount.class).getCount();
    boolean onGround = false;
    Vector3f velocity = get(LinearVelocity.class).getVelocity();
    PhysicsPosition pos = get(PhysicsPosition.class);

    //the most important part is the ray system which keeps the capsule floating
    //in the air over the ground
    List<PhysicsRayTestResult> rayTestResultList = bulletSystem.getPhysicsSpace()
            .rayTest(pos.getLocation(), pos.getLocation().add(0,-50,0));
    if(rayTestResultList.size() > 0){
        float len = 60;
        for (PhysicsRayTestResult physicsRayTestResult : rayTestResultList) {
            if(physicsRayTestResult.getHitFraction()*50 < len){
                len = physicsRayTestResult.getHitFraction()*50;
            }
        }
        //if the character is near the ground or below it push it to the min step height.
        if(len <= character.getStepHeight() + bodyHeight/2){
            float diff = character.getStepHeight() + bodyHeight/2-len;
            set(new WarpPosition(pos.getLocation().add(0, diff,  0), pos.getRotation()));
            if(velocity.y < 0) {
                set(new WarpVelocity(velocity.clone().setY(0), Vector3f.ZERO));
            }
            onGround = true;
            set(new PhysicsCharacterJumpCount(0));
            jumpCount = 0;
        }
    }

    Vector3f impulse = new Vector3f();
    //apply jump
    if(jumping && (onGround || jumpCount < character.getMaxJumpNumber())){
        set(new PhysicsCharacterJumpCount(jumpCount+1));
        impulse.addLocal(new Vector3f(0, character.getMass()*jumpSpeed, 0));
    }
    //slow the character down if no movement is applied
    if(onGround){
        Vector3f slowDownImpulse = new Vector3f();
        if(FastMath.approximateEquals(move.x, 0)){
            slowDownImpulse.setX(-velocity.x*character.getMass()*0.05f);
        }
        if(FastMath.approximateEquals(move.y, 0)){
            slowDownImpulse.setZ(-velocity.z*character.getMass()*0.05f);
        }
        impulse.addLocal(slowDownImpulse);
    }
    //TODO use combined impulse
    set(new Impulse(impulse, new Vector3f()));
}