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Charting library for Android compatible with API 8+(Android 2.2).

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package lecho.lib.hellocharts.renderer;

import android.graphics.Canvas;

import lecho.lib.hellocharts.model.SelectedValue;
import lecho.lib.hellocharts.model.Viewport;

/**
 * Interface for all chart renderer.
 */
public interface ChartRenderer {

    public void onChartSizeChanged();

    public void onChartDataChanged();

    public void onChartViewportChanged();

    public void resetRenderer();

    /**
     * Draw chart data.
     */
    public void draw(Canvas canvas);

    /**
     * Draw chart data that should not be clipped to contentRect area.
     */
    public void drawUnclipped(Canvas canvas);

    /**
     * Checks if given pixel coordinates corresponds to any chart value. If yes return true and set selectedValue, if
     * not selectedValue should be *cleared* and method should return false.
     */
    public boolean checkTouch(float touchX, float touchY);

    /**
     * Returns true if there is value selected.
     */
    public boolean isTouched();

    /**
     * Clear value selection.
     */
    public void clearTouch();

    public Viewport getMaximumViewport();

    public void setMaximumViewport(Viewport maxViewport);

    public Viewport getCurrentViewport();

    public void setCurrentViewport(Viewport viewport);

    public boolean isViewportCalculationEnabled();

    public void setViewportCalculationEnabled(boolean isEnabled);

    public void selectValue(SelectedValue selectedValue);

    public SelectedValue getSelectedValue();

}