Sender: AnsiEditor Ansi Ansi, message area: ANSI Title: Draw a circle Sending station: Sun and Moon Guanghua June 05, 2004 14:59:00 Saturday, in-site mail Incomplete tutorial on color block painting 3. Draw a circle by lstar@smth In the previous section, we have explained the basic characters and their evolution in color blocks. Now let’s look at the actual applications. one time The materials we have are all square and square, so you need to draw a properly placed one. Squares, rectangles should be pretty easy. I won't go into detail here. What we're going to talk about is how to use these. Squares to draw a circle Now that we have all kinds of squares and triangles, we want to make a circle. Do you feel that you don’t know where to start? Come here Here's a helper. Let's see how it's done. dntx@bbs.zixia.net has written a bmp2asc software that can convert bmp graphics into ASCII graphics. Let’s use it first to see what the circle it converts looks like. From this we can get some inspiration. The usage of this software will be discussed specifically later. There is no need to pay attention to and delve into its usage now. We first use any drawing software to make a round bmp graphic. Generally, the background of BBS is Black, so the background of our picture is also black. This converted picture is more usable. picture We take dx 3 among them. Why do we choose this? Please don’t pay attention first. We want to get a circle. Now Without paying attention to the selection details of this dx, select dark green and black as the color and click Go to convert picture This gives us the circle below dx 3 Let’s see what inspiration this circle can give us. Look at the upper part of the circle Use blocks of different heights to simulate arcs. This method is Isn't it similar to the algorithm of integration in calculus? Different rectangles to approximate the outline of a curve. This is The secret of the color block diagram lies The human eye has a strong ability to correct errors. Within the allowed range, I will use my brain to subjectively interpret what I see. Think about it according to your own thinking inertia. This provides us with great convenience in making color block diagrams. We are looking at the picture above. The arc shown to us looks relatively smooth. There is another very important reason. Because the transition between each color block is relatively uniform. Remember, uniformity is the key in the color block diagram. Of course If you need your own special effects, that's another matter When looking at the part of the circle where the arc changes greatly, the converted image is simulated using triangles. This can be To make the graphics look more concise and smooth. In fact, we use the above method to simulate this completely with squares. Circle is also possible Use three character blocks. Don’t use three character blocks. The use of three-character blocks in color block diagrams is a noteworthy issue. The main applications in color block diagrams are related to arcs. In terms of size, using triangular squares at appropriate corners can add the finishing touch, but don’t use them too much to make them look dull. If you use it too much, it will look stiff. You still need to practice and experience it to grasp this degree. Feel the comparison between triangles and pure square color blocks, and then experience the connections between various color blocks and triangles. VS With the above explanation, I think you should have a general understanding of the use of basic components in the color block diagram. But the specific application proficiency requires you to experience it in practice. We will draw the most difficult basic shape in the color block diagram, the circle. Then we should not deal with other shapes. Next words This time I have a homework. As mentioned before, it is easy to draw rectangles and squares with correct angles using color blocks. For example The following So what do you do if you need to draw a rectangle tilted 30 degrees? You need to make an equilateral triangle. How to draw shapes? This is our homework this time. You can think about it. I think we have the foundation to draw circles. Completing this assignment shouldn't be difficult Source: Sun and Moon Guanghua bbs.fudan.edu.cn [FROM: 10.100.146.236] Modification: AnsiEditor modified this article at 14:59:27 on June 5th [FROM: 10.100.146.236]