pxt-calliope/libs/microbit/images.cpp

#include "ksbit.h"

/**
* Creation, manipulation and display of LED images.
*/
//% color=45 weight=31
namespace images {
    /**
     * Creates an image that fits on the LED screen.
     */
    //% weight=75 help=images/create-image
    //% blockId=device_build_image block="create image"
    Image createImage(ImageLiteral leds) {
        return MicroBitImage(imageBytes(leds)).clone().leakData();
    }

    /**
     * Creates an image with 2 frames.
     */
    //% weight=74 help=images/create-big-image
    //% blockId=device_build_big_image block="create big image" imageLiteral=2
    Image createBigImage(ImageLiteral leds) {
        return createImage(leds);
    }
}

namespace ImageMethods {
    /**
     * Shows an frame from the image at offset ``x offset``.
     * @param xOffset TODO
     */
    //% help=images/show-image weight=80 async
    //% BUGblockId=device_show_image_offset block="show image %sprite|at offset %offset" blockGap=8
    void showImage(Image i, int xOffset = 0) {
      uBit.display.print(MicroBitImage(i), -xOffset, 0, 0);
    }
    
    /**
     * Scrolls an image .
     * @param frameOffset x offset moved on each animation step, eg: 5, 1, -1
     * @param interval time between each animation step in milli seconds, eg: 200
     */
    //% help=images/show-image weight=79 async
    //% BUGblockId=device_scroll_image block="scroll image %sprite|with offset %frameoffset|and interval (ms) %delay" blockGap=8
    void scrollImage(Image id, int frameOffset = 0, int interval = 200) {
      MicroBitImage i(id);
      if (i.getWidth() <= 5)
        showImage(id, 0);
      else
        uBit.display.animate(i, interval, frameOffset, 0);
    }


    /**
     * Plots the image at a given column to the screen
     */            
    //% help=images/plot-image
    void plotImage(Image i, int xOffset = 0) {
      uBit.display.print(MicroBitImage(i), -xOffset, 0, 0, 0);
    }

    /**
     * Sets all pixels off.
     */
    //% help=images/clear
    void clear(Image i) {
      MicroBitImage(i).clear();
    }

    /**
     * Sets a specific pixel brightness at a given position
     */
    //% help=
    void setPixelBrightness(Image i, int x, int y, int value) {
      MicroBitImage(i).setPixelValue(x, y, value);
    }


    /**
     * Gets the pixel brightness ([0..255]) at a given position
     */
    //% help=
    int pixelBrightness(Image i, int x, int y) {
      int pix = MicroBitImage(i).getPixelValue(x, y);
      if (pix < 0) return 0;
      return pix;
    }
}