Back to project page customhellochartdemo.
The source code is released under:
Apache License
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package lecho.lib.hellocharts.renderer; /*from w ww . j av a 2s.c o m*/ import lecho.lib.hellocharts.model.SelectedValue; import lecho.lib.hellocharts.model.Viewport; import android.graphics.Canvas; /** * Interface for all chart renderer. */ public interface ChartRenderer { /** * Initialize maximum viewport, called when chart data changed.Usually you will have to do some calculation in * implementation of that method. If isViewportCalculationEnabled is false this method should do nothing. */ public void initMaxViewport(); /** * Initialize currentViewport, usually set it equals to maxViewport. If isViewportCalculationEnabled is false this * method should do nothing. */ public void initCurrentViewport(); /** * Initialize measurements i.e. circle area for PieChart. */ public void initDataMeasuremetns(); /** * Initialize common data attributes label font size, font color etc. Should be called before viewports * initializations. */ public void initDataAttributes(); /** * 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 void setMaxViewport(Viewport maxViewport); public Viewport getMaxViewport(); public void setCurrentViewport(Viewport viewport); public Viewport getCurrentViewport(); public boolean isViewportCalculationEnabled(); public void setViewportCalculationEnabled(boolean isEnabled); public void selectValue(SelectedValue selectedValue); public SelectedValue getSelectedValue(); }