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The graph tools in Maths Helper Plus make it possible to interact with the graph view.

After selecting the tool you want to use from the graph tools toolbar (shown above), you move the mouse cursor over the graph view then click and drag to work sheer magic!

 The point tool displays rectangular or polar coordinates of the cursor. It also plots points onto the graph and can trace around function curves. The line tool displays a line segment or a vector on the graph view. Click and drag to change the segment length and gradient. As the line is moved, the displayed linear equation is continuously updated. Plot the line or vector by pressing the space bar. Function graphs can capture the displayed line as a moveable tangent. The ellipse tool has two modes, ellipse or circle. In ellipse mode, the mouse cursor displays an ellipse with directrices and foci. Click and drag to change the ellipse size and shape, or the circle area. The displayed equation is continuously updated. Plot the curves by pressing the space bar. The parabola tool displays two kinds of parabolas plus the directrix and focus. Click and drag to change the shape of the parabola. The equation of the parabola is updated to reflect the changes. Press the space bar to plot the displayed curves and points. The sine tool displays the mouse cursor as a sine or a cosine curve. Click and drag to change amplitude, period and phase. Press the space bar to plot the displayed curve. The normal tool displays the mouse cursor as a normal curve. The mean and standard deviation are calculated and continuously updated as the shape of the curve is changed. Click and drag the mouse to change the curve shape, and press the space bar to plot. The intersection tool finds accurate intersections between function graphs, or graphs and axes. Click the mouse cursor near the intersection point and it is calculated instantly and accurately. The turning point tool finds accurate turning points on function graphs. Click the mouse cursor on the function graph near the turning point. The linear programming tool provides a moveable objective function that can be used to locate linear programming solutions on the graph view. The integral tool finds definite integrals and areas under graphs by a simple click and drag technique. The values are updated continuously as the mouse is dragged on the graph view. The angle tool displays a moveable arc to measure angles on the graph view. The angle tool works even if the 'x' and 'y' scales are different, and gives results in degrees, radians and multiples of pi. The text label tool is for putting descriptive text labels on the graph view.