Detailed method of drawing shadows on geometric sketchpad

php Xiaobian Youzi will introduce you to the detailed method of drawing shadows on the geometric sketchpad. When drawing shadows on the geometric sketchpad, you must first prepare the sketchpad and brush, and then determine the position and shape of the shadow based on the light source position and shadow direction of the object. Then, by controlling the angle and strength of the brush, draw the outline of the shadow and the gradient effect of the shadow. Finally, combined with color and detail processing, the shadows are made more realistic and vivid. In this way, you can draw shadow works with three-dimensional and realistic effects.

Operation method 1. Use shortcut keys to draw shadows

For some relatively simple graphics, we can use shortcuts to complete it. For example, first draw a simple triangle on the geometry board, and then draw a line inside the triangle!

Here, draw a shadow on the small triangle, select the arrow tool, select the point of the triangle, and press the shortcut key Ctrl P to draw the shadow.

You can adjust the color inside the small triangle. Select the inside of the triangle, right-click, select color, and then select the color you want.

Operation method two, use the tracking line segment function to draw shadows

For some more complex graphics, this shortcut method does not work, then we can use Using the line segment tracing function, as shown in the picture, how to fill the intersection of two circles with a shadow?

Step 1 First, draw a line segment in the area that needs to be shaded, select this line segment, and execute the [Display]-[Track Line Segment] command.

At this time, you can put the mouse on the line segment (that is, select the line segment), and then drag the line segment to draw the line. The speed at which the line is dragged depends on it!

Different thread colors will have different effects. You can also use this method to operate more complex graphics. If you can't draw some, you can try using a few more line segments!

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