1 /*
   2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.scenario.effect.impl.state;
  27 
  28 import com.sun.javafx.geom.Rectangle;
  29 import com.sun.javafx.geom.transform.BaseTransform;
  30 
  31 public class MotionBlurState extends LinearConvolveKernel {
  32     private float radius;
  33     private float angle;
  34 
  35     public float getRadius() {
  36         return radius;
  37     }
  38 
  39     public void setRadius(float radius) {
  40         if (radius < 0f || radius > 63f) {
  41             throw new IllegalArgumentException("Radius must be in the range [0,63]");
  42         }
  43         this.radius = radius;
  44     }
  45 
  46     public float getAngle() {
  47         return angle;
  48     }
  49 
  50     public void setAngle(float angle) {
  51         this.angle = angle;
  52     }
  53 
  54     public int getHPad() {
  55         return (int) Math.ceil(Math.abs(Math.cos(angle)) * radius);
  56     }
  57 
  58     public int getVPad() {
  59         return (int) Math.ceil(Math.abs(Math.sin(angle)) * radius);
  60     }
  61 
  62     @Override
  63     public LinearConvolveRenderState getRenderState(BaseTransform filtertx) {
  64         float dx = (float) Math.cos(angle);
  65         float dy = (float) Math.sin(angle);
  66         return new GaussianRenderState(radius, dx, dy, filtertx);
  67     }
  68 
  69     @Override
  70     public boolean isNop() {
  71         return (radius == 0f);
  72     }
  73 
  74     @Override
  75     public int getKernelSize(int pass) {
  76         return ((int) Math.ceil(radius)) * 2 + 1;
  77     }
  78 
  79     @Override
  80     public final Rectangle getResultBounds(Rectangle srcdimension, int pass) {
  81         Rectangle ret = new Rectangle(srcdimension);
  82         ret.grow(getHPad(), getVPad());
  83         return ret;
  84     }
  85 }