- TRANSPARENT RECTANGLE SHAPE WITH SMILEY FACE HOW TO
- TRANSPARENT RECTANGLE SHAPE WITH SMILEY FACE CODE
First, we clear the screen by drawing a solid black background using ofBackground(.). Success! Each time our draw() function executes, three things happen. When we run the code, we see white shapes on a black background. OfSetColor( 255) // Set the drawing color to white // Draw some shapes OfBackground( 0) // Clear the screen with a black color The top left pixel of the blue calender icon (with the white "19") is (58, 5). We can see the pixels and identify their locations in our new coordinate system. If we apply this to the top left of my screen figure 1 (right), which happens to be my browser. Second, the y axis is flipped such that the positive y direction is located below the origin figure 1 (center). First, (0, 0) is the upper leftmost pixel of the screen. Computer graphics are based on this same system, but with two twists. Remember figure 1 (left) from math class? A pair of values (x, y) told us how far away we were from (0, 0), the origin. Computer graphics use the Cartesian coordinate system.
TRANSPARENT RECTANGLE SHAPE WITH SMILEY FACE HOW TO
Basic Shapesīefore drawing any shape, we need to know how to specify locations on screen.
In this section, we will focus on the basic shapes. Basic shapes are rectangles, circles, triangles and straight lines. We can classify the 2D graphics functions into two categories: basic shapes and freeform shapes. To create brushes, we need to define some basic building blocks of graphics. You can find them in your ofSketch folder, by looking for ofSketch/data/Projects/YOUR_PROJECT_NAME/bin/data/. 3) Some of the applications you write will save images to your computer.
2) You'll want to use ofSetWindowShape(int width, int height) in setup() to control the size of your application. When you see those instructions, that means you should put your variables above your setup() function in ofSketch. 1) There will be a few points where variables are added to something called a header file (. Coding in ofSketch is a bit different than coding in other Xcode, Code::Blocks, etc. If you are following along using ofSketch, great! There are a couple things to note.
TRANSPARENT RECTANGLE SHAPE WITH SMILEY FACE CODE
If you feel lost at any point, don't hesitate to look at the completed code! You can check out the whole collection of code here - both for standard development structure (Xcode, QtCreator, Visual Studio, etc.) and for ofSketch. Source code for the projects is linked at the end of each section. In section 3, we will explore something called "coordinate system transformations" to create hypnotizing, spiraling rectangles. In sections 1 and 2, we will create "paintbrushes" where the mouse is our brush and our code defines how our brush makes marks on the screen. This chapter builds off of the C++ Basics and Setup and Project Structure chapters, so if you aren't familiar with basic C++ and creating openFrameworks projects, check out those chapters first. By: Michael Hadley with generous editor support from Abraham Avnisan, Brannon Dorsey and Christopher Baker.
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