teensy-libcurve

nice curves for PaulStoffregen/ST7735_t3 and newdigate/teensy-st7735-linux-stubs

• work in progress
• antialiased lines and bezier curves (there is an option to turn antialiasing on / off)
• compile for teensy or linux
• disclaimer - this is not an efficient way of calculating a bezier curve.
• potential improvements
  • tiny distortion when antialiasing and curve changes from steep to not steep or visa versa

contents

• download
• teensy
  • dependencies
  • build
  • install arduino library
• linux
  • dependencies
  • build
  • install
• Xiaolin Wu's line algorithm

download

• download and uncompress .zip
• or git clone https://github.com/newdigate/teensy-libcurve

teensy

dependencies

• arm-eabi-none-gcc
• newdigate
  • teensy-cmake-macros
• PaulStoffregen
  • cores
  • ST7735_t3
  • SPI

build

• clone the dependencies above to a chosen folder (in this case ~/temp_dep)

 > mkdir ~/temp_dep && cd ~/temp_dep
 > git clone https://github.com/PaulStoffregen/cores
 > git clone https://github.com/PaulStoffregen/ST7735_t3
 > git clone https://github.com/PaulStoffregen/SPI

• open src/CMakeLists.teensy.cmake.in
  • update set(COMPILERPATH "/Applications/ARM/bin/")
    • point to installation bin folder of arm-eabi-none-gcc
  • update set(DEPSPATH "/Users/xxx/temp_dep")
    • point to dependencies folder
• build

  > cd teensy-libcurve
  > mkdir cmake-build-teensy && cd cmake-build-teensy
  > cmake ../src -DCMAKE_BUILD_TYPE=Debug
  > make

install arduino library

• create shortcut/symlink to src folder in your Arduino Libraries folder
• there is a cmake target to creates a symlink to ~/Documents/Arduino/Libraries (for macos)

  > cd teensy-libcurve/src
  > mkdir cmake-build-debug
  > cd cmake-build-debug
  > cmake -DCMAKE_BUILD_TYPE=Debug ..
  > make installarduino

linux

dependencies

• newdigate
  • teensy-x86-stubs
  • teensy-st7735-linux-stubs

build

• install dependencies
  • install each dependency as per instructions on repository README.md
• build

  > cd teensy-libcurve
  > mkdir cmake-build-linux && cd cmake-build-linux
  > cmake ../src -DCMAKE_BUILD_TYPE=Debug -DOPT_BUILD_FOR_LINUX=ON
  > make

install

  > cd teensy-libcurve
  > mkdir cmake-build-linux && cd cmake-build-linux
  > cmake ../src -DCMAKE_BUILD_TYPE=Debug -DOPT_BUILD_FOR_LINUX=ON
  > sudo make install

Xiaolin Wu's line algorithm

• wikipedia