Detailed method of constructing diagonal shadow using trajectory method in Geometric Sketchpad

php editor Xiaoxin has compiled several detailed methods for using the trajectory method to construct diagonal shadows on the drawing board. Diagonal shading is a common decorative effect that adds depth and dimension to an artboard. By mastering a few different construction methods, you can easily use slash shading in your paintings to make them more lively and interesting. This article will introduce several common methods of constructing diagonal shadows to help you better use this technique. Whether you are a newbie or an experienced painting enthusiast, I believe these methods can help you.

1. Use the polygon interior tool (the second one without lines among the polygon tools) to construct a polygon interior. Select the interior of the polygon, select [Construction] - [Point on Boundary] to get point A, select the polygon and press [Ctrl H] to hide the interior of the polygon.

2. Double-click any vertex, select point A, select [Scale] - [Fixed Ratio], set it to 1:1 to scale, and get point B. At this time point A and point B coincide.

3. Use the mouse to drag to select these two points (be careful not to click with the mouse here, use drag (that is, place the mouse in the blank space to pull the area to be selected). If you select For redundant items, click to select and cancel) to select, otherwise only one of them will always be selected), select [Construction] - [Trajectory], and get a polygon perimeter.

4. Connect the leftmost and rightmost points of the polygon to obtain a line segment. Use the point tool to pick any point C on the line segment.

5. Use the line segment tool to draw a line segment in the blank space (used to determine the direction of the diagonal shadow), select point C and this selection, select [Construction] - [Parallel] Wire】. The two intersection points of the parallel line and the polygon are E and F. Use the line segment tool to construct the line segment EF. Right-click on the selected line segment and select [Thin Line] or [Dotted Line].

6. Select line segment EF and point C, select [Construction] - [Trajectory], right-click to select the trajectory, select [Properties] - [Drawing], and change [Sampling Number] Modify it to between 50-100. Hide extra line segments and points.

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