rmozel

Thank you all for your prompt responses. My intend was to display the error ellipse of a 2D covariance matrix. I understood that pressing on this will lead unnecessarily complex and possibly resource heavy floating point operations. So, I will take a different approach to represent this information on the display. Regards.

Hi, I am new to uGFX. In my application, I need to rotate the wire or filled ellipse axes by a given angle. Is there a simple way to do this without delving into implementation details of the ellipse function? Regards, Renan

Hi, I am new to uGFX. Although the software running as expected, I get warning messages at the compilation step: /Users/mbp/work/stm32/toolc/ugfx_2.5/src/gos/gos_x_threads.c:10:5: warning: "GOS_NEED_X_THREADS" is not defined [-Wundef] #if GOS_NEED_X_THREADS ^ /Users/mbp/work/stm32/toolc/ugfx_2.5/src/gos/gos_x_heap.c:10:5: warning: "GOS_NEED_X_HEAP" is not defined [-Wundef] #if GOS_NEED_X_HEAP ^ /Users/mbp/work/stm32/toolc/ugfx_2.5/drivers/gdisp/SSD1306/gdisp_lld_SSD1306.c: In function 'gdisp_lld_flush': /Users/mbp/work/stm32/toolc/ugfx_2.5/drivers/gdisp/SSD1306/gdisp_lld_SSD1306.c:153:8: warning: "SSD1306_SH1106" is not defined [-Wundef] #if SSD1306_SH1106 ^ The configuration is: STM32F401RET Nucleo board Adafruit 0.96 inch OLED display with SSD1306 STM32F401RE-Nucleo SSD1306 ChibiOS 1.0 example dated Feb 12, 2016 uGFX Library v2.5 ChibiOS/RT v16.1.4 GCC-ARM-Embedded 5 Q1 2016 Mac OS X 10.11.5 Thanks in advance.