The next object goes in display list 2, plus the call to display list 3. When you add the first object (line segment or whatever), put its primitives in display list 1 and end it with a call to display list 2. Have display() call display list 1 (which is not yet defined). * Well, you can use display lists to get OpenGL to remember primitives. OpenGL does NOT keep track of your primitives for you.* This means that you need to keep track of them on your own. This makes changing the background color just using glClearColor (as Andrew Baldwin suggests) and then clearing and redrawing the scene as normal. The default list is named "EazyDraw" which provides a sequence of 256 colors varied by Hue, Saturation, and brightness.Most OpenGL programs redraw the entire scene (from a scene graph, which can be as simple as an array) when a change needs to take place. The color list used is determined by the selection of "Toolbar Colors" on the main EazyDraw preferences panel. Any color list is used as the set of colors provided by the toolbar color pickers. These are found in the Colors folder in the user home Library folder. The colors shown on the pop-down menu are derived from a standard macOS color list. Then proceed with drawing activity, each color is conveniently available with a single click of the appropriate version of the duplicate color picker tools. ![]() Then use each picker pop-down menu to select a different color. Add the desired number multiple color pickers to the toolbar using the customization panel. This can be useful to provide quick access to a few colors. It is possible to have duplicates of color picker tools on the toolbar. When a color selection action is complete, slide the mouse off the menu and it will close, or click on the lower color swatch, a double click will also close the menu. Repeated clicks are allowed, to select and view the larger swatch. This active color is shown in the large color swatch at the bottom of the menu. Move the cursor over the desired color, click and the active color will change. A palette of a colors is presented as a pop-down menu. The current active color is changed by clicking and holding down on the color picker tool. The active color is shown on the tool icon. To apply the current active color for the tool to a graphic(s), select the graphic and perform a simple - quick - click of the tool. The active color will change only by holding the click on the tool until the pop-down color selection menu is presented. Selecting a graphic will not cause the active color of the tool to change. ![]() The color picker tool is NOT an inspector of colors. The Color and Style palette used in conjunction with the macOS system color picker is used to access the full range of colors available for your drawing. ![]() This method of color selection is limited to the very few of all possible colors, that are provided on the color samples array. The desired form of the tool must be overtly added to the toolbar with the toolbar customization panel. There are separate toolbar color picker tools for picking Fill color, Stroke (or line) color, and Text color. The shown color may be applied with a simple click of the tool. ![]() This most recent color is shown in the color swatch on the tool icon. These can provide an alternative to the system color picker for managing fill and stroke colors in a convenient one or two click fashion.Ī color picker tool is a "smart" tool, it will remember the last color chosen. Toolbar tools for color picking of Fill Color, Stroke Color and Text Color are available on the toolbar customization panel.
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