In the earlier post demonstrating the use of libssd1306, we did not explain how one would use an event library such as libev to write an application that would use events to perform display changes. With this post we would like to show how to do that easily with a simple clock application that updates the OLED screen with the local time every second.
We are updating the previous post on drawing text, since we realized we needed to fix a major display bug in pixel locating the text. In addition to that we updated the API for drawing text to return a bounding box around the drawn text so that the developer can know the pixel coordinates of where the text was drawn in the framebuffer. We also updated the bit-dump API to optionally add color to the terminal output.
Read More →In an earlier post we had discussed the framebuffer object of the C library for performing graphics on the OLED screen SSD1306 using a Raspberry Pi. We also discussed how to draw text using FreeType2.
In this post we show you how to draw straight lines on the OLED screen using our
ssd1306_framebuffer_draw_line() function.
In the previous post we had discussed the framebuffer object of the C library for performing graphics on the OLED screen SSD1306 using a Raspberry Pi.
In this blog post, we demonstrate how we have used FreeType2 to draw
text on the screen using fonts that can be installed using your Raspbian distro
packages. FreeType2 provides an easy way to render any type of supported font on
the screen, and we encapsulate all of that in a single function call
ssd1306_framebuffer_draw_text().
In the previous post we had introduced the C library for performing graphics on the OLED screen SSD1306 using a Raspberry Pi.
In this post we explain the framebuffer object and how to draw individual pixels on the screen.
Read More →