Blends the pixels in the display window according to the defined mode. There is a choice of the following modes to blend the source pixels (A) with the ones of pixels already in the display window (B): :blend - linear interpolation of colours: C = A*factor + B :add - additive blending with white clip: C = min(A*factor + B, 255) :subtract - subtractive blending with black clip: C = max(B - A*factor, 0) :darkest - only the darkest colour succeeds: C = min(A*factor, B) :lightest - only the lightest colour succeeds: C = max(A*factor, B) :exclusion - similar to :difference, but less extreme. :multiply - Multiply the colors, result will always be darker. :screen - Opposite multiply, uses inverse values of the colors. :replace - the pixels entirely replace the others and don't utilize alpha (transparency) values Note: :hard-light, :soft-light, :dodge, :overlay, :dodge, :burn, :difference modes are not supported by this function. factor is alpha value of pixel being drawed
[w h renderer path]
[w h renderer]
Creates and returns a new PGraphics object of the types :p2d, :p3d, :java2d, :pdf. By default :java2d is used. Use this class if you need to draw into an off-screen graphics buffer. It's not possible to use create-graphics with the :opengl renderer, because it doesn't allow offscreen use. The :pdf renderer requires the filename parameter. Note: don't use create-graphics in draw in clojurescript, it leaks memory. You should create graphic in setup and reuse it in draw instead of creating a new one. It's important to call any drawing commands between (.beginDraw graphics) and (.endDraw graphics) statements or use with-graphics macro. This is also true for any commands that affect drawing, such as smooth or color-mode. If you're using :pdf renderer - don't forget to call (.dispose graphics) as last command inside with-graphics macro, otherwise graphics won't be saved. Unlike the main drawing surface which is completely opaque, surfaces created with create-graphics can have transparency. This makes it possible to draw into a graphics and maintain the alpha channel. By using save to write a PNG or TGA file, the transparency of the graphics object will be honored.