How to draw a point on the screen

Summary
This article shows how to draw a point on the screen. In this example, the point will not persist on the screen but will be removed after the next screen refresh.

Drawing a point on the screen
The following code draws a point on the screen in the ActiveView where the mouse is clicked. The x,y coordinates come from a mousedown click event when the user interacts with the application.
[Java] 
static void drawPoint(IActiveView activeView, int x, int y)throws Exception{
    IScreenDisplay screenDisplay = activeView.getScreenDisplay();

    // Constant.
    screenDisplay.startDrawing(screenDisplay.getHDC(), (short)
        esriScreenCache.esriNoScreenCache);
    ISimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbol();

    ISymbol symbol = (ISymbol)simpleMarkerSymbol;
    screenDisplay.setSymbol(symbol);
    IDisplayTransformation displayTransformation =
        screenDisplay.getDisplayTransformation();

    // X and y are in device coordinates.
    IPoint point = displayTransformation.toMapPoint(x, y);

    screenDisplay.drawPoint(point);
    screenDisplay.finishDrawing();
}


See Also:

How to draw a polyline on the screen
How to draw a polygon on the screen
How to draw a rectangle on the screen



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