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    {
      "cell_type": "code",
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      "source": [
        "%matplotlib inline"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# Draw markers\n\nIn this example, you will learn how to mark points in ``1d`` or ``2d`` plots\nwith markers of varying shapes, colors and sizes. Multiple markers\ncan be set in one group with a corresponding name. It is also possible\nto delete such groups using its name again.\n\nFor this feature, the designer plugin ``itom1dqwtplot`` and ``itom2dqwtplot``\nhave the slots ``plotMarkers`` and ``deleteMarkers``.\n\nThe slot ``deleteMarkers`` is defined as follows:\n\n```python\nmyPlot.call(\"deleteMarkers\", groupname)\n```\nThe slot ``plotMarkers`` is defined as follows:\n\n```python\nmyPlot.call(\"plotMarkers\", points, style, groupname = \"\")\n```\nwhere:\n\n* points is a 2xN ``dataObject`` with N points. The first row is the x-coordinate, the 2nd row the y-coordinate.\n* style is defined as follows: ``r*20`` or ``r*20;2``, where ``r`` is the color, ``*``  the shape and ``20`` the size of the shape in pixel. Optionally 2 is the line width. \n\nPossible colors are:\n    \n== =======\nb  blue\ng  green\nr  red\nc  cyan\nm  magenta\ny  yellow\nk  black\nw  white\n== =======\n   \nPossible shapes are:\n    \n== ===========================\n.  point\no  ellipse\ns  square\nd  diamond\n>  triangle, tip to the right\nv  triangle, tip to the bottom\n^  triangle, tip to the top\n<  triangle, tip to the left\nx  x-cross\n\\* star\n\\+ cross\nh  hexagon\n== ===========================\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import numpy as np\nfrom itom import dataObject\nfrom itom import plot\n\n# 1d sine\nsine = dataObject(np.sin(np.arange(0, 10 * np.pi, (1 / 20) * np.pi)))\n\n# 3d object with two different chessboards in both planes\nchessboard = dataObject.zeros([2, 1024, 1024], \"uint8\")\ncolor = 0\nfor r in range(0, 1024, 64):\n    color = 255 if color == 0 else 0  # invert color\n    for c in range(0, 1024, 64):\n        chessboard[0, r : r + 64, c : c + 64] = color\n        color = 255 if color == 0 else 0  # invert color\nfor r in range(0, 1024, 128):\n    color = 255 if color == 0 else 0  # invert color\n    for c in range(0, 1024, 128):\n        chessboard[1, r : r + 128, c : c + 128] = color\n        color = 255 if color == 0 else 0  # invert color\n\n[i1, h1] = plot(sine)\n[i2, h2] = plot(chessboard)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Mark all zero values of the sine with red stars (size: 20).\nThe name of this set of 11 points is called *zero-points*.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "zeros = dataObject.zeros([2, 11], \"float32\")\nfor i in range(0, 11):\n    zeros[0, i] = 20 * i\nh1.call(\"plotMarkers\", zeros, \"r*20\", \"zero-points\")\n\n# in order to delete the set, call\nh1.call(\"deleteMarkers\", \"zero-points\")\n# and set it again\nh1.call(\"plotMarkers\", zeros, \"r*20\", \"zero-points\")"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Mark all local maximas of the sine with green dots (size: 5).\nThe name of this set is *local-maximas*.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "maximas = dataObject.zeros([2, 5], \"float32\")\nfor i in range(0, 5):\n    maximas[1, i] = 1\n    maximas[0, i] = 10 + 40 * i\nh1.call(\"plotMarkers\", maximas, \"gs5\", \"local-maximas\")"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://../../_static/demoDrawMarkers_1.png\" width=\"100%\">\n\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Put crosses at all corner points of the chessboard.\nPlease consider, that both chessboards in both planes have different\nmarker patterns.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "[X1, Y1] = np.meshgrid(range(64, 1024, 64), range(64, 1024, 64))\n[X2, Y2] = np.meshgrid(range(128, 1024, 128), range(128, 1024, 128))\n\ncorners1 = dataObject([2, 225], \"int32\")\ncorners1[0, :] = X1.flatten()\ncorners1[1, :] = Y1.flatten()\n\ncorners2 = dataObject([2, 49], \"int32\")\ncorners2[0, :] = X2.flatten()\ncorners2[1, :] = Y2.flatten()\n\nh2.call(\"plotMarkers\", corners1, \"r+25;2\", \"corners1\", 0)  # draw to plane 0 only\nh2.call(\"plotMarkers\", corners2, \"c+25\", \"corners2\", 1)  # draw to plane 1 only"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://../../_static/demoDrawMarkers_2.png\" width=\"100%\">\n"
      ]
    }
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