Use this method to fill the client area with a Message handler by using your class wizard and choosing WM_ERASEBKGND Once satisfied that your draw program is working, add an OnEraseBkgnd().Such as OnLButtonDown(), OnMouseMove(), OnLButtonUp() Develop your project so that your mouse drawing functions in the view,.Set cursor offset (used in conjunction with increment)ĭevelop your project so that your mouse drawing functions in the view, suchĪs OnLButtonDown(), OnMouseMove(), OnLButtonUp()Īre in place and working without SnapCursor.The program is ready for the next circle. When released, the circle is painted in a final color and The circle drags to the desired sizeĪs the cursor jumps. When the left mouse button is depressed, the center of theĬircle is placed at the SnapCursor point. The regular cursor moves smoothly across the screen, the second cursor jumps in In the demo project, you canĭraw circles starting from center, then dragging to the radius that you want. Mouse cursor, which is not replaced or eliminated. When enabled, a second, crosshair cursor follows the regular Once added, SnapCursor works much like the snap-to-grid option on my 3DS MAX SnapCursor class so it could be dropped into any project and used with a minimum As I got this feature to work, I generated anĮxample project, which would be as simple as possible and would help me package It struck me that this would be a good firstĪrticle to place on Code Project. I searched the web and found lots of questions on how to do it, some I remembered that my 3DS MAX program has a snap-to-gridįeature. I needed an accurate way of placing these
The User Grids panel controls automatic activation of grid objects and settings for AutoGrid.I have been developing a graphics application, which uses controls to createĪnd place objects on the drawing. The home grid provides a visual reference for creating objects in a scene. Choosing useful home grid settings can simplify the construction process. The Home Grid panel of the Grid And Snap Settings dialog sets the spacing and other characteristics of the home grid.
The Options panel of the Grid And Snap Settings dialog lets you set options related to snapping. For example, you might be creating a spline while snapping to grid points, but then need to snap one of its vertices to the midpoint of an object.
Snap Override lets you supersede all the currently selected snap types and temporarily use only one, or none, of the snap types currently selected on the Grid And Snap Settings dialog. The controls in this dialog set the snap strength and other characteristics such as the snap target.
Snapping gives you additional control when creating, moving, rotating, and scaling objects by causing the cursor to “jump” to specific portions of existing geometry and other scene elements during creation and transformation of objects or sub-objects.
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