Examples with Viewport lecho.lib.hellocharts.model.Viewport used on opensource projects

Example 1 with Viewport

use of lecho.lib.hellocharts.model.Viewport in project hellocharts-android by lecho.

the class ChartScroller method scroll.

public boolean scroll(ChartComputator computator, float distanceX, float distanceY, ScrollResult scrollResult) {
    // Scrolling uses math based on the viewport (as opposed to math using pixels). Pixel offset is the offset in
    // screen pixels, while viewport offset is the offset within the current viewport. For additional
    // information on
    // surface sizes and pixel offsets, see the docs for {@link computeScrollSurfaceSize()}. For additional
    // information about the viewport, see the comments for {@link mCurrentViewport}.
    final Viewport maxViewport = computator.getMaximumViewport();
    final Viewport visibleViewport = computator.getVisibleViewport();
    final Viewport currentViewport = computator.getCurrentViewport();
    final Rect contentRect = computator.getContentRectMinusAllMargins();
    final boolean canScrollLeft = currentViewport.left > maxViewport.left;
    final boolean canScrollRight = currentViewport.right < maxViewport.right;
    final boolean canScrollTop = currentViewport.top < maxViewport.top;
    final boolean canScrollBottom = currentViewport.bottom > maxViewport.bottom;
    boolean canScrollX = false;
    boolean canScrollY = false;
    if (canScrollLeft && distanceX <= 0) {
        canScrollX = true;
    } else if (canScrollRight && distanceX >= 0) {
        canScrollX = true;
    }
    if (canScrollTop && distanceY <= 0) {
        canScrollY = true;
    } else if (canScrollBottom && distanceY >= 0) {
        canScrollY = true;
    }
    if (canScrollX || canScrollY) {
        computator.computeScrollSurfaceSize(surfaceSizeBuffer);
        float viewportOffsetX = distanceX * visibleViewport.width() / contentRect.width();
        float viewportOffsetY = -distanceY * visibleViewport.height() / contentRect.height();
        computator.setViewportTopLeft(currentViewport.left + viewportOffsetX, currentViewport.top + viewportOffsetY);
    }
    scrollResult.canScrollX = canScrollX;
    scrollResult.canScrollY = canScrollY;
    return canScrollX || canScrollY;
}

Example 2 with Viewport

use of lecho.lib.hellocharts.model.Viewport in project hellocharts-android by lecho.

the class AbstractChartView method getZoomLevel.

@Override
public float getZoomLevel() {
    Viewport maxViewport = getMaximumViewport();
    Viewport currentViewport = getCurrentViewport();
    return Math.max(maxViewport.width() / currentViewport.width(), maxViewport.height() / currentViewport.height());
}

Example 3 with Viewport

use of lecho.lib.hellocharts.model.Viewport in project hellocharts-android by lecho.

the class AbstractChartView method canScrollHorizontally.

/**
     * When embedded in a ViewPager, this will be called in order to know if we can scroll.
     * If this returns true, the ViewPager will ignore the drag so that we can scroll our content.
     * If this return false, the ViewPager will assume we won't be able to scroll and will consume the drag
     *
     * @param direction Amount of pixels being scrolled (x axis)
     * @return true if the chart can be scrolled (ie. zoomed and not against the edge of the chart)
     */
@Override
public boolean canScrollHorizontally(int direction) {
    if (getZoomLevel() <= 1.0) {
        return false;
    }
    final Viewport currentViewport = getCurrentViewport();
    final Viewport maximumViewport = getMaximumViewport();
    if (direction < 0) {
        return currentViewport.left > maximumViewport.left;
    } else {
        return currentViewport.right < maximumViewport.right;
    }
}

Example 4 with Viewport

use of lecho.lib.hellocharts.model.Viewport in project hellocharts-android by lecho.

the class AbstractChartView method moveTo.

@Override
public void moveTo(float x, float y) {
    Viewport scrollViewport = computeScrollViewport(x, y);
    setCurrentViewport(scrollViewport);
}

Example 5 with Viewport

use of lecho.lib.hellocharts.model.Viewport in project hellocharts-android by lecho.

the class AbstractChartView method setZoomLevelWithAnimation.

@Override
public void setZoomLevelWithAnimation(float x, float y, float zoomLevel) {
    Viewport zoomViewport = computeZoomViewport(x, y, zoomLevel);
    setCurrentViewportWithAnimation(zoomViewport);
}