Rasterizy is a program which purpose is to create and manipulate geometric shapes using vector approach to graphics. Available shapes are as follows:
- Line
- Circle
- Polygon
- Capsule
- Rectangle
For each shape there are available several actions:
- Draw
- Move
- Delete
- Thicken
- Recolor
- Move vertex (for Polygon and Rectangle only)
- Clip (Polygon only)
- Fill (Polygon only, either with provided image or with a solid colour)
Note: Capsule is not fully implemented and can only be drawn.
Also, antialiasing can be turned on for all the shapes (which will result in reverting thickness parameter to 1),
Executable file of the program can be run on a Windows operating system, or with an appropriate software on other OS's, which would let user run .exe files.
Upon entering any mode after clicking a button, an appropriate message is displayed in a label.
For all shapes, Draw draws shapes with thickness specified in Thicc field and color chosen from the Color dialog.
In order to draw a line, one has to turn the Line mode on, make sure that Draw attribute is selected and click twice on the picturebox, selecting two endpoints of the line, which is drawn onto the picturebox using DDA algorithm.
To draw a circle, one has to turn the Circle mode with Draw attribute, and select two points - first one is going to be the center, second one - a radius. Circle is drawn using an Alternative Midpoint Circle algorithm.
To be able to draw a polygon, one ought to select the Poly mode with Draw attribute, and then pick multiple points on the picturebox. For polygon to be closed, one has to select a final pixel in an immediate vicinity of the first one - then, program will automaticaly close the polygon and draw it onto the picturebox. To make matters easier, starting vertex is shown as a single black pixel, so user can easily come back to it, should he or she consider that polygon is to be closed.
In order to draw a capsule, Capsule mode with Draw attribute has to be selected. Then, user has to pick three points, which are going to be a symmetric center of a capsule, center of one circle and radius of it, respectively.
To draw a rectangle, Rectangle mode with Draw attribute should be chosen. Then, two picked points will make a diagonal of rectangle, which will be put onto the picturebox (rectangle, not diagonal).
To move any shape, one has to select an appropriate mode with Move attribute. Then, user has to pick two points - one on the perimeter of a given shape, and second wherever on the picturebox user wants this point to be after translation. Then, these two points will make up vector, which every point of the shape is to be translated by.
In order to delete a shape, user ought to select an appropriate mode with Delete attribute. One click on the perimeter of a given shape, will remove this shape from the picturebox.
To be able to change a thickness of a given shape, one has to select an appropriate mode with Thicken attribute, and change the Thicc field to a desired value. One click on the perimeter of a given shape, will change its thickness to a value specified in Thicc field. Lines are thickened using Copying pixels algorithm.
Note: Due to the different method of implementation. thickening and drawing Circle and Capsule with a thickness greater than 1 will take more time than similar operation performed on the different shapes
To change a colour of a given shape, one has to select an appropriate mode with Recolor attribute, and change the colour of Color dialog to a preferred one. One click on the perimeter of a given shape, will change its colour to a value specified in Color dialog.
In order to move a vertex of a given polygon, one has to select Poly or Rectangle mode with Move vertex attribute. Then, user has to select a point in a close vicinity of a vertex of any polygon, and then select a new point where this vertex is to be put. In Polygon edges leading to the moved vertex will be corrected, while in Rectangle all edges and two neighbour vertices are going to be adjusted.
To clip a polygon to a second one, user has to select Poly mode with Clip attribute. Then, one draws two polygons, one after another, and the first one is clipped to the second one using Sutherland-Hodgman algorithm. After operation is performed, these two polygons are subject to any Polygon operation.
Clicking the Antialiasing button will turn on or off the antialiasing, implemented using Xiaolin Wu algorithm. When antialiasing is turned on, all thicknesses are reduced to 1, but after turning the antialiasing off, they come back to their previous values.
To fill a Polygon, one has to select one of two options (both use Active Edge Table algorithm with Edge Table method of updating):
User has to click Fill poly button, and then select a polygon to fill with a colour selected in a Color dialog
One ought to click Fill with Image button, which will open a file dialog to choose an image from disk. Then, user has to select a Polygon to fill with the chosen image.
To flood fill, user should click Flood fill button and select a point in the picturebox that's going to be a starting point for non-recursive flood fill algorithm. Then. algorithm will fill the image with a selected colour from the Color dialog, until it reaches some boundary. Bear in mind, that this filling, when performed inside a shape, isn't tied to it, as it is the case with two previous filling algorithms.
User can save and load contents of the picturebox to and from a .minicg file using Save and Load dialogs.
To clear a picturebox, one has to click Clear button which will remove all the shapes and information associated with them