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Developers docs for Desmosoft Paint
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BUGS.md

Known Bugs

  • Click-freeze: If you click any of lines drawn, desmos will freeze. Sometimes you can recover your drawing but most of the time it is cleared.

Report more in the comments

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DEVELOPERS.md

Desmos Paint Variable And Function Docs

Desmos Paint versions:

Global Constants / Variables

  • w: number, alias for Desmos constant width
  • h: number, alias for Desmos constant height
  • P_en: bool, whether the pen is down or not (down is true)
  • W_o: color, White color. (Was the white-out color for the white out system) (Deprecated)
  • H: number, actual numerical height (relative to the graph). Normal height is in pixels and is relative to the screen.
  • H_p: number, height percentile. UI elements that adjust with the screen will use this.

Line and Draw Utilities

  • L(a: cord, b: cord): function, draws a line between a and b (using slope-intercept and X limits)
  • L_y(a: cord, b: cord): function, draws a vertical line between a and b if they are vertical. used as x = L_y(a, b)
  • D(P: list[cord]): function, draws a line between all points in P.
  • D_y(P: list[cord]): function, draws a line between all the straight up point pairs in P.

Controls

  • C_1: cord, current mouse coordinate
  • C_2: cord, previous mouse coordinate
  • Note: Large 0 opacity drag-able image serves as the mouse cursor

Class: Double Click D_c

  • D_c: number[time], double-click timer
  • D_cf(): function[action], general click function. Adds time to the double click timer, adds a break in the art, flips the pen variable. (Calls B_r())
  • D_cc: function[action], double click click. The click function. If double click, call clear C_l(). Otherwise, call D_cf()

Core

  • U(): function[action], update line data. Adds the current mouse coordinates to the art list. Also adds current color and full opacity to their respective lists.
  • R(): functions[action], call U() if not C_2 = C_1
  • M(): function[action], main function called on each clock cycle. If pen is down call R(). Otherwise, update previous coordinates to current coordinates. (Legacy)
  • M_t(): function[action], main function with account for FPS, delay, and time. Was implemented once I stopped relating on the builtin ticker timing. Calls M()

Line

  • A: list[cord], the “art” list. Contains coordinates who make the line that is your drawing.
  • A_w: list[number], contains opacity numbers for each segment specified in A. Deprecated Version: list[cord], contains the whiteout line.
  • C_l(): function[action], clears the canvas. Resets all canvas-state variables. Does not reset the color pallet and cursor position like R_eset() does.
  • B_r(): function[action], creates a break in the current line structure by inserting opacity.

Class GUI G

  • Note: Background rounded rectangle, uses equation max(0,|x-x1|-scaled_width)^2 + max(0, |y-y1|-scaled-height)^2 = (corner_radius)^2
  • G_diff: number, space between color circles
  • G_iw: number, width of a color circle and it’s margin
  • G_df(i: number): function, calculates the position of a the i’th circle.
  • G_r: number, radius of the color circles.
  • G_cn: number, color circle count. Adjusted by 4 to leave space for custom color area.

Class Colors C

  • C_c: number, current color index of color list C
  • C_s: list[number], color selected. Can be applied to the border opacity value of the circles and produces a “selected” effect.
  • C_b: list[color], base colors, applied to the pallet on reset.
  • C_A: list[color], colors for the A line list. This enables changing of colors.
  • C: list[color], the current color pallet. Length is 15

Extras

  • D_t: number[time], the difference time between ticks in milliseconds.
  • F_ps: number, the current FPS of the program. Displayed in the bottom left.

Class Color Picker C_capital

  • C_setCurrent(): function[action], updates the color pallet at the current selection to the custom color C_C
  • C_C: color, the current custom color.
  • C_Lf: number, length/width of the color selection bars.
  • C_Xi: number, the X initial for the color selection bars.
  • C_D(h_1: number): function, draws a dot bar at dynamic height h_1 (relative to H_p)
  • C_I: list[color], an index array for dot bars.
  • C_H, C_S, C_V: number, parts of the custom HSV color value. All are adjustable with sliders.
  • C_Hc, C_Sc: color, the partial HSV values at each stage for preview.
  • C_Hac, C_Sac, C_Vac: respective and dynamic color/gradient list.
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