Adds ConstraintLayoutExamples samples.

Change-Id: I4a8fe277a65316e114e2d16f84d6b8fae78fbae5

ConstraintLayoutExamples/.gitignore

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+*.iml
+.gradle
+local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.idea/

ConstraintLayoutExamples/.google/packaging.yaml

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+
+# GOOGLE SAMPLE PACKAGING DATA
+#
+# This file is used by Google as part of our samples packaging process.
+# End users may safely ignore this file. It has no relevance to other systems.
+---
+status:       PUBLISHED
+technologies: [Android]
+categories:   [UI]
+languages:    [Java]
+solutions:    [Mobile]
+github:       android/views-widgets
+license: apache2

ConstraintLayoutExamples/CycleEditor/src/com/google/androidstudio/motionlayoutcycles/AnimationPanel.java

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+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.androidstudio.motionlayoutcycles;
+
+import javax.swing.*;
+import javax.swing.border.LineBorder;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+
+/**
+ * This panel simulates and Android view parameter for controlling a button
+ */
+class AnimationPanel extends JPanel {
+
+  public static final String[] EASING_OPTIONS = Easing.NAMED_EASING;
+  private static final boolean RENDERING_STATS = Boolean.parseBoolean(System.getProperty("stats"));
+  private float mDuration = 20000; // duration in milliseconds
+  private float myAnimationPercent;
+  private long myLastTime;
+  private static final int BUTTON_WIDTH = 123;
+  private static final int BUTTON_HEIGHT = 40;
+  private String myTitle = "button";
+  private JButton myPlayButton;
+  private boolean myIsPlaying = false;
+  private Timer myPlayTimer = new Timer(14, e -> step());
+  private CycleSetModel myCycleModel;
+  private int myAttributeMask;
+  private Easing myEasing = Easing.getInterpolator(Easing.STANDARD_NAME);
+  private float myEasedPercent;
+  static final Stroke DASH_STROKE = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER,
+      1, new float[]{10, 10}, 0);
+
+  AnimationPanel(CycleSetModel cycleModel, JButton play) {
+    super(new FlowLayout(FlowLayout.LEFT));
+    setBackground(new Color(0xF8F8F4));
+    setBorder(new  LineBorder(new Color(0x888888),1));
+    myCycleModel = cycleModel;
+    myPlayButton = play;
+    myPlayButton.addActionListener(e -> play());
+  }
+
+  public void setEasing(String easing) {
+    myEasing = Easing.getInterpolator(easing);
+  }
+
+  public void setModel(CycleSetModel cycleModel) {
+    myCycleModel = cycleModel;
+  }
+
+  public void setMode() {
+    myAttributeMask = myCycleModel.getAttributeMask();
+  }
+
+  public void play() {
+    if (myIsPlaying) {
+      myCycleModel.setDot(Float.NaN);
+      pause();
+      myIsPlaying = false;
+      return;
+    }
+    myPlayButton.setText("pause");
+    myIsPlaying = true;
+    myAttributeMask = myCycleModel.getAttributeMask();
+    myPlayTimer.start();
+  }
+
+  int call_count = 0;
+  int paint_count = 0;
+  long last_update;
+
+  public void step() {
+    long time = System.currentTimeMillis();
+    myAnimationPercent += (time - myLastTime) / mDuration;
+    if (myAnimationPercent > 1.0f) {
+      myAnimationPercent = 0;
+    }
+    myEasedPercent = (float) myEasing.get(myAnimationPercent);
+
+    myCycleModel.setDot(myEasedPercent);
+    call_count++;
+    repaint();
+    myLastTime = time;
+  }
+
+  public void pause() {
+    myPlayButton.setText("play");
+    myPlayTimer.stop();
+  }
+
+  @Override
+  public void paint(Graphics g) {
+    super.paint(g);
+    paint_count++;
+    long time = System.currentTimeMillis();
+    int w = getWidth();
+    int h = getHeight();
+    float buttonCX = w / 2.0f;
+    float buttonCY = h / 2.0f;
+    float startX = buttonCX;
+    float startY = buttonCY;
+    float endX = buttonCX;
+    float endY = buttonCY;
+    if (myMoveObject != 0) {
+      float dx = movement[myMoveObject][0];
+      float dy = movement[myMoveObject][1];
+      startX = buttonCX - (dx * w) / 3.0f;
+      startY = buttonCY - (dy * h) / 3.0f;
+      endX = buttonCX + (dx * w) / 3.0f;
+      endY = buttonCY + (dy * h) / 3.0f;
+      buttonCX = startX + myEasedPercent * (endX - startX);
+      buttonCY = startY + myEasedPercent * (endY - startY);
+
+    }
+    Graphics2D g2d = (Graphics2D) g.create();
+    AffineTransform at;
+    Stroke old = g2d.getStroke();
+    g2d.setColor(Color.RED);
+    g2d.setStroke(DASH_STROKE);
+    g2d.drawLine((int) startX, (int) startY, (int) endX, (int) endY);
+    g2d.setStroke(old);
+    Color background = Color.LIGHT_GRAY;
+    Color border = Color.DARK_GRAY;
+    Color text = Color.BLACK;
+    if (myAttributeMask != 0) {
+
+      if ((myAttributeMask & (1 << CycleView.Prop.PATH_ROTATE.ordinal())) != 0) {
+        at = new AffineTransform();
+        at.rotate(Math.toRadians(myCycleModel.getValue(CycleView.Prop.PATH_ROTATE, myEasedPercent)), buttonCX,
+            buttonCY);
+        g2d.transform(at);
+      }
+      if ((myAttributeMask & (1 << CycleView.Prop.ALPHA.ordinal())) != 0) {
+        int alpha = Math
+            .max(0, Math.min(255, (int) (myCycleModel.getValue(CycleView.Prop.ALPHA, myEasedPercent) * 255)));
+        background = new Color(background.getRed(), background.getGreen(), background.getBlue(),
+            alpha);
+        border = new Color(border.getRed(), border.getGreen(), border.getBlue(), alpha);
+        text = new Color(text.getRed(), text.getGreen(), text.getBlue(), alpha);
+      }
+
+      if ((myAttributeMask & (1 << CycleView.Prop.SCALE_X.ordinal())) != 0) {
+        at = new AffineTransform();
+        at.translate(w / 2.0, buttonCY);
+        at.scale(myCycleModel.getValue(CycleView.Prop.SCALE_X, myEasedPercent), 1);
+        at.translate(-w / 2.0, -buttonCY);
+
+        g2d.transform(at);
+      }
+
+      if ((myAttributeMask & (1 << CycleView.Prop.SCALE_Y.ordinal())) != 0) {
+
+        at = new AffineTransform();
+        at.translate(buttonCX, buttonCY);
+        at.scale(1, myCycleModel.getValue(CycleView.Prop.SCALE_Y, myEasedPercent));
+        at.translate(-buttonCX, -buttonCY);
+        g2d.transform(at);
+      }
+
+      if ((myAttributeMask & (1 << CycleView.Prop.TRANSLATION_X.ordinal())) != 0) {
+
+        at = new AffineTransform();
+        at.translate(myCycleModel.getValue(CycleView.Prop.TRANSLATION_X, myEasedPercent), 0);
+        g2d.transform(at);
+      }
+
+      if ((myAttributeMask & (1 << CycleView.Prop.TRANSLATION_Y.ordinal())) != 0) {
+
+        at = new AffineTransform();
+        at.translate(0, myCycleModel.getValue(CycleView.Prop.TRANSLATION_Y, myEasedPercent));
+        g2d.transform(at);
+      }
+      if ((myAttributeMask & (1 << CycleView.Prop.ROTATION.ordinal())) != 0) {
+        at = new AffineTransform();
+        at.rotate(Math.toRadians(myCycleModel.getValue(CycleView.Prop.ROTATION, myEasedPercent)), buttonCX,
+            buttonCY);
+        g2d.transform(at);
+      }
+
+    }
+
+    int px = (int) (0.5 + buttonCX - BUTTON_WIDTH / 2.0f);
+    int py = (int) (0.5 + buttonCY - BUTTON_HEIGHT / 2.0f);
+
+    g2d.setColor(background);
+    g2d.fillRoundRect(px, py, BUTTON_WIDTH, BUTTON_HEIGHT, 5, 5);
+    g2d.setColor(border);
+    g2d.drawRoundRect(px, py, BUTTON_WIDTH, BUTTON_HEIGHT, 5, 5);
+    int sw = g.getFontMetrics().stringWidth(myTitle);
+    int fh = g.getFontMetrics().getHeight();
+    int fa = g.getFontMetrics().getAscent();
+    g2d.setColor(text);
+    g2d.drawString(myTitle, px + BUTTON_WIDTH / 2 - sw / 2, py + BUTTON_HEIGHT / 2 + fa - fh / 2);
+    if (time - last_update > 1000) {
+      if (RENDERING_STATS) {
+
+        System.out.println("render" + 1000 * call_count / (time - last_update) + "fps paint "
+            + 1000 * paint_count / (time - last_update) + "fps");
+      }
+      last_update = time;
+      paint_count = 0;
+      call_count = 0;
+    }
+  }
+
+  static String[] MOVE_NAMES = {"Stationary", "South to North", "West to East", "SW to NE",
+      "NW to SE", "SE to NW", "NE to SW"};
+  static String[] DURATION = {"0.1s", "0.5s", "1.0s", "2.0s", "5s", "10s", "20s"};
+  static int[] DURATION_VAL = {100, 500, 1000, 2000, 5000, 10000, 20000};
+
+  static int[][] movement = {
+      {0, 0},
+      {0, -1},
+      {1, 0},
+      {1, -1},
+      {1, 1},
+      {-1, -1},
+      {-1, 1},
+  };
+  int myMoveObject = 0;
+
+  public void setMovement(int move) {
+    myMoveObject = move;
+    repaint();
+  }
+
+  public void setDurationIndex(int selectedIndex) {
+    mDuration = DURATION_VAL[selectedIndex];
+  }
+}