Example usage for java.lang Math atan

List of usage examples for java.lang Math atan

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Introduction

In this page you can find the example usage for java.lang Math atan.

Prototype

public static double atan(double a)

Source Link

Document

Returns the arc tangent of a value; the returned angle is in the range -pi/2 through pi/2.

Usage

From source file:cc.flydev.launcher.Workspace.java

@Override
protected void determineScrollingStart(MotionEvent ev) {
    if (!isFinishedSwitchingState())
        return;/*from w  w w . jav  a 2s .c  om*/

    float deltaX = ev.getX() - mXDown;
    float absDeltaX = Math.abs(deltaX);
    float absDeltaY = Math.abs(ev.getY() - mYDown);

    if (Float.compare(absDeltaX, 0f) == 0)
        return;

    float slope = absDeltaY / absDeltaX;
    float theta = (float) Math.atan(slope);

    if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
        cancelCurrentPageLongPress();
    }

    boolean passRightSwipesToCustomContent = (mTouchDownTime
            - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;

    boolean swipeInIgnoreDirection = isLayoutRtl() ? deltaX < 0 : deltaX > 0;
    if (swipeInIgnoreDirection && getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID
            && passRightSwipesToCustomContent) {
        // Pass swipes to the right to the custom content page.
        return;
    }

    if (theta > MAX_SWIPE_ANGLE) {
        // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
        return;
    } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
        // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
        // increase the touch slop to make it harder to begin scrolling the workspace. This
        // results in vertically scrolling widgets to more easily. The higher the angle, the
        // more we increase touch slop.
        theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
        float extraRatio = (float) Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
        super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
    } else {
        // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
        super.determineScrollingStart(ev);
    }
}

From source file:com.wb.launcher3.Workspace.java

@Override
protected void determineScrollingStart(MotionEvent ev) {
    if (!isFinishedSwitchingState())
        return;//w  w  w. j  a  v  a  2  s.c  om

    float deltaX = ev.getX() - mXDown;
    float absDeltaX = Math.abs(deltaX);
    float absDeltaY = Math.abs(ev.getY() - mYDown);

    if (Float.compare(absDeltaX, 0f) == 0)
        return;

    float slope = absDeltaY / absDeltaX;
    float theta = (float) Math.atan(slope);

    if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
        cancelCurrentPageLongPress();
    }

    boolean passRightSwipesToCustomContent = (mTouchDownTime
            - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;

    boolean swipeInIgnoreDirection = isLayoutRtl() ? deltaX < 0 : deltaX > 0;
    if (swipeInIgnoreDirection && getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID
            && passRightSwipesToCustomContent) {
        // Pass swipes to the right to the custom content page.
        return;
    }

    if (theta > MAX_SWIPE_ANGLE) {
        //*/Added by tyd Greg 2014-03-21,for support the touch swipe gesture
        if (TydtechConfig.SWIPE_GESTURE_ENABLED && (isInOverviewMode() == mStartIsOverViewMode)
                && (mPointCount == 1) && (mTouchUPCountTemp == mPointCount)) {
            CellLayout cell = (CellLayout) getChildAt(mCurrentPage);
            if (true) {
                float y = ev.getY();
                if ((y - mYDown) > 0) {
                    if (Math.abs(y - mYDown) > (mTouchSlop * 5)
                            && LauncherAppState.getInstance().getSwipeDownEnable())
                        mTouchState = TOUCH_SWIPE_DOWN_GESTURE;
                } else {
                    if (Math.abs(y - mYDown) > (mTouchSlop * 5)
                            && LauncherAppState.getInstance().getSwipeUpEnable())
                        mTouchState = TOUCH_SWIPE_UP_GESTURE;
                }
            }
        }
        mTouchUPCountTemp = mPointCount;
        //*/
        // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
        return;
    } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
        // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
        // increase the touch slop to make it harder to begin scrolling the workspace. This
        // results in vertically scrolling widgets to more easily. The higher the angle, the
        // more we increase touch slop.
        theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
        float extraRatio = (float) Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
        super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
    } else {
        // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
        super.determineScrollingStart(ev);
    }
}

From source file:com.aidy.launcher3.ui.workspace.Workspace.java

@Override
protected void determineScrollingStart(MotionEvent ev) {
    if (!isFinishedSwitchingState())
        return;/*from  w  ww.ja  v  a2  s.  co m*/

    float deltaX = ev.getX() - mXDown;
    float absDeltaX = Math.abs(deltaX);
    float absDeltaY = Math.abs(ev.getY() - mYDown);

    if (Float.compare(absDeltaX, 0f) == 0)
        return;

    float slope = absDeltaY / absDeltaX;
    float theta = (float) Math.atan(slope);

    if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
        cancelCurrentPageLongPress();
    }

    boolean passRightSwipesToCustomContent = (mTouchDownTime
            - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;

    boolean swipeInIgnoreDirection = isLayoutRtl() ? deltaX < 0 : deltaX > 0;
    if (swipeInIgnoreDirection && getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID
            && passRightSwipesToCustomContent) {
        // Pass swipes to the right to the custom content page.
        return;
    }

    if (theta > MAX_SWIPE_ANGLE) {
        // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the
        // workspace
        return;
    } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
        // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE,
        // we want to
        // increase the touch slop to make it harder to begin scrolling the
        // workspace. This
        // results in vertically scrolling widgets to more easily. The
        // higher the angle, the
        // more we increase touch slop.
        theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
        float extraRatio = (float) Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
        super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
    } else {
        // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything
        // special
        super.determineScrollingStart(ev);
    }
}

From source file:Geometry.java

/**
 * Create the geometry of an arrow. The arrow is positioned at the
 * end (last point) of the specified polyline, as follows:
 *
 *                      0,4--,              
 *                         \  --,           
 *                          \    --,        
 *                           \      --,     
 *                            \        --,  
 *    -------------------------3-----------1
 *                            /        --'  
 *                           /      --'     
 *                          /    --'        
 *                         /  --'           
 *                        2--'                
 * //from  w ww. j ava 2s .c  o m
 * @param x       X coordinates of polyline of where arrow is positioned
 *                in the end. Must contain at least two points.
 * @param y       Y coordinates of polyline of where arrow is positioned
 *                in the end.
 * @param length  Length along the main axis from point 1 to the
 *                projection of point 0.
 * @param angle   Angle between the main axis and the line 1,0
 *                (and 1,2) in radians.
 * @param inset   Specification of point 3 [0.0-1.0], 1.0 will put
 *                point 3 at distance length from 1, 0.0 will put it
 *                at point 1.
 * @return        Array of the five coordinates [x,y,...]. 
 */
public static int[] createArrow(int[] x, int[] y, double length, double angle, double inset) {
    int[] arrow = new int[10];

    int x0 = x[x.length - 1];
    int y0 = y[y.length - 1];

    arrow[2] = x0;
    arrow[3] = y0;

    // Find position of interior of the arrow along the polyline
    int[] pos1 = new int[2];
    Geometry.findPolygonPosition(x, y, length, pos1);

    // Angles
    double dx = x0 - pos1[0];
    double dy = y0 - pos1[1];

    // Polyline angle
    double v = dx == 0.0 ? Math.PI / 2.0 : Math.atan(Math.abs(dy / dx));

    v = dx > 0.0 && dy <= 0.0 ? Math.PI + v
            : dx > 0.0 && dy >= 0.0 ? Math.PI - v
                    : dx <= 0.0 && dy < 0.0 ? -v : dx <= 0.0 && dy > 0.0 ? +v : 0.0;

    double v0 = v + angle;
    double v1 = v - angle;

    double edgeLength = length / Math.cos(angle);

    arrow[0] = x0 + (int) Math.round(edgeLength * Math.cos(v0));
    arrow[1] = y0 - (int) Math.round(edgeLength * Math.sin(v0));

    arrow[4] = x0 + (int) Math.round(edgeLength * Math.cos(v1));
    arrow[5] = y0 - (int) Math.round(edgeLength * Math.sin(v1));

    double c1 = inset * length;

    arrow[6] = x0 + (int) Math.round(c1 * Math.cos(v));
    arrow[7] = y0 - (int) Math.round(c1 * Math.sin(v));

    // Close polygon
    arrow[8] = arrow[0];
    arrow[9] = arrow[1];

    return arrow;
}

From source file:spinworld.gui.RadarPlot.java

private void drawTickLabel(Graphics2D g2, Rectangle2D radarArea, Point2D middlePoint, double _axisAngle,
        int cat, double tick) {
    double axisAngle = normalize(_axisAngle);
    double _origin = getOrigin(cat).doubleValue();
    double max = getMaxValue(cat).doubleValue();
    double tickValue = ((max - _origin) * tick) + _origin;
    String label = "" + Math.round(tickValue * 1000) / 1000d;
    FontRenderContext frc = g2.getFontRenderContext();
    Rectangle2D labelBounds = getLabelFont().getStringBounds(label, frc);
    int labelW = (int) labelBounds.getWidth();
    int labelH = (int) labelBounds.getHeight();

    double centerX = radarArea.getCenterX();
    double centerY = radarArea.getCenterY();

    double adj = middlePoint.distance(centerX, centerY);
    double opp = TICK_MARK_LENGTH / 2 + 4;
    double hyp = Math.sqrt(Math.pow(opp, 2) + Math.pow(adj, 2));
    double angle = Math.toDegrees(Math.atan(opp / adj));
    int charHeight = g2.getFontMetrics().getHeight();
    int charWidth = g2.getFontMetrics().charWidth('M');

    double alphaRad = Math.toRadians(axisAngle - angle);
    double labelX = centerX + (hyp * Math.cos(alphaRad));
    double labelY = centerY - (hyp * Math.sin(alphaRad)) + labelH;

    //        g2.draw(new Line2D.Double(centerX, centerY, labelX, labelY - labelH)); // test line

    double sinGap = Math.pow(Math.sin(Math.toRadians(axisAngle)), 2);
    if (axisAngle > 90 && axisAngle < 270) {
        labelY -= labelH;// w w  w .j  a v a  2 s . c o m
        labelY += (charHeight * sinGap / 2);
    } else {
        labelY -= (charHeight * sinGap / 2);
    }
    double cosGap = Math.pow(Math.cos(Math.toRadians(axisAngle)), 2);
    if (axisAngle > 180) {
        labelX -= labelW;
        labelX += (charWidth * cosGap / 2);
    } else {
        labelX -= (charWidth * cosGap / 2);
    }
    //        g2.drawRect((int) labelX, (int) labelY - labelH, labelW, labelH); // test rectangle
    g2.setPaint(getLabelPaint());
    g2.setFont(getLabelFont());
    g2.drawString(label, (float) labelX, (float) labelY);
}

From source file:com.klinker.android.launcher.launcher3.Workspace.java

@Override
protected void determineScrollingStart(MotionEvent ev) {
    if (!isFinishedSwitchingState())
        return;/* w  ww .j  av  a 2  s .  c  o m*/

    float deltaX = ev.getX() - mXDown;
    float absDeltaX = Math.abs(deltaX);
    float absDeltaY = Math.abs(ev.getY() - mYDown);

    if (Float.compare(absDeltaX, 0f) == 0)
        return;

    float slope = absDeltaY / absDeltaX;
    float theta = (float) Math.atan(slope);

    if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
        cancelCurrentPageLongPress();
    }

    boolean passRightSwipesToCustomContent = (mTouchDownTime
            - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;

    boolean swipeInIgnoreDirection = mIsRtl ? deltaX < 0 : deltaX > 0;
    boolean onCustomContentScreen = getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID;
    if (swipeInIgnoreDirection && onCustomContentScreen && passRightSwipesToCustomContent) {
        // Pass swipes to the right to the custom content page.
        return;
    }

    if (onCustomContentScreen && (mCustomContentCallbacks != null)
            && !mCustomContentCallbacks.isScrollingAllowed()) {
        // Don't allow workspace scrolling if the current custom content screen doesn't allow
        // scrolling.
        return;
    }

    if (theta > MAX_SWIPE_ANGLE) {
        // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
        return;
    } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
        // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
        // increase the touch slop to make it harder to begin scrolling the workspace. This
        // results in vertically scrolling widgets to more easily. The higher the angle, the
        // more we increase touch slop.
        theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
        float extraRatio = (float) Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
        super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
    } else {
        // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
        super.determineScrollingStart(ev);
    }
}

From source file:com.example.aaron.test.MyGLSurfaceView.java

public void setVoronoiCoordinates() {

    temp.clear();/* w ww  .  j av  a2  s.c om*/
    temp2.clear();
    for (int i = 0; i < maxBots; i++) {
        if (tList[i].getOn() == 1) {
            temp.add((double) tList[i].getX());
            temp2.add((double) tList[i].getY());
            recievedTurtles = true;
        }
    }
    if (temp != null && recievedTurtles == true) {

        double[] temp3 = new double[temp.size()];
        double[] temp4 = new double[temp.size()];
        for (int i = 0; i < temp.size(); i++) {
            temp3[i] = temp.get(i);
            temp4[i] = temp2.get(i);
        }

        //voronoiEdges = vor.generateVoronoi(temp3, temp4, -width1 / (height1*mRenderer.scale)*2, width1 / (height1*mRenderer.scale)*2, -height1 / (height1*mRenderer.scale)*2, height1 / (height1*mRenderer.scale)*2);
        voronoiEdges = vor.generateVoronoi(temp3, temp4, -1, 1, -1, 1);

        for (int i = 0; i < voronoiEdges.size(); i++) {
            cd = Math.cos(Math.atan((voronoiEdges.get(i).x1 - voronoiEdges.get(i).x2)
                    / (voronoiEdges.get(i).y1 - voronoiEdges.get(i).y2)));
            cy = Math.sin(Math.atan((voronoiEdges.get(i).x1 - voronoiEdges.get(i).x2)
                    / (voronoiEdges.get(i).y1 - voronoiEdges.get(i).y2)));

            vorCoords[0] = (float) voronoiEdges.get(i).x1 + (float) cd * .005f / mRenderer.scale;
            vorCoords[1] = (float) voronoiEdges.get(i).y1 - (float) cy * .005f / mRenderer.scale;

            vorCoords[9] = (float) voronoiEdges.get(i).x2 + (float) cd * .005f / mRenderer.scale;
            vorCoords[10] = (float) voronoiEdges.get(i).y2 - (float) cy * .005f / mRenderer.scale;

            vorCoords[3] = (float) voronoiEdges.get(i).x1 - (float) cd * .005f / mRenderer.scale;
            vorCoords[4] = (float) voronoiEdges.get(i).y1 + (float) cy * .005f / mRenderer.scale;

            vorCoords[6] = (float) voronoiEdges.get(i).x2 - (float) cd * .005f / mRenderer.scale;
            vorCoords[7] = (float) voronoiEdges.get(i).y2 + (float) cy * .005f / mRenderer.scale;

            mRenderer.setVoronoiCoordinates(vorCoords, i, voronoiEdges.size(), voronoiEdges.get(i).x1,
                    voronoiEdges.get(i).y1, voronoiEdges.get(i).x2, voronoiEdges.get(i).y2);

        }
    }
}

From source file:org.apache.sysml.runtime.codegen.LibSpoofPrimitives.java

public static void vectAtanAdd(double[] a, double[] c, int ai, int ci, int len) {
    for (int j = ai; j < ai + len; j++, ci++)
        c[ci] += Math.atan(a[j]);
}

From source file:org.apache.sysml.runtime.codegen.LibSpoofPrimitives.java

public static void vectAtanAdd(double[] a, double[] c, int[] aix, int ai, int ci, int alen, int len) {
    for (int j = ai; j < ai + alen; j++)
        c[ci + aix[j]] += Math.atan(a[j]);
}

From source file:org.apache.sysml.runtime.codegen.LibSpoofPrimitives.java

public static double[] vectAtanWrite(double[] a, int ai, int len) {
    double[] c = allocVector(len, false);
    for (int j = 0; j < len; j++, ai++)
        c[j] = Math.atan(a[ai]);
    return c;/*from  w w  w  .  j  av a2  s .c om*/
}