A Simple Discrete-Event Simulation: Part 88

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Today I updated the code to define DisplayGroups for all non-Path components, which means the internal data for each component will become visible when the relevant component is clicked. Moreover, each visible DisplayGroup object can be dragged to a new location. These operations work for both mouse and touch operations. Try it out and see what you think.

I’m still highly annoyed that the intersection test doesn’t always generate the proper result, which causes the pointer not to be displayed, but the effect is otherwise pretty smooth.

I cleaned up some code that caused the frame colors for the DisplayGroups to not be consistent (mostly by commenting out some old stuff) and shortened up the definition function for DisplayGroups to use default colors that can be customized separately.

Here’s the code for handling events, made consistent for mouse and touch ops.

    var selectedDataGroup;
    
    function selectDisplayGroup(x, y) {
      var i = 0;
      if (setOfComponents.length > 0) {
        var done = false;
        while (!done) {
          if ((typeof setOfComponents[i].dataGroup !== "undefined") &&
              (setOfComponents[i].dataGroup.isVisible()) &&
              (setOfComponents[i].dataGroup.isClickInside(x, y))) {
            done = true;
          } else {
            i++;
          }
          if (i >= setOfComponents.length) {
            done = true;
          }
        }
        if (i < setOfComponents.length) {
          return i;
        } else {
          return -1;
        }
      } else {
        return -1;
      }
    }
    
    function selectComponent(x, y) {
      var i = 0;
      if (setOfComponents.length > 0) {
        var done = false;
        while (!done) {
          if ((typeof setOfComponents[i].graphic !== "undefined") &&
              (setOfComponents[i].graphic.isClickInside(x, y))) {
            done = true;
          } else {
            i++;
          }
          if (i >= setOfComponents.length) {
            done = true;
          }
        }
        if (i < setOfComponents.length) {
          if (!setOfComponents[i].graphic.highlighted) {
            setOfComponents[i].graphic.highlight();
            if (typeof setOfComponents[i].dataGroup !== "undefined") {
              setOfComponents[i].dataGroup.turnOn();
            }
            drawModel();
          } else {
            setOfComponents[i].graphic.unHighlight();
            if (typeof setOfComponents[i].dataGroup !== "undefined") {
              setOfComponents[i].dataGroup.turnOff();
            }
            drawModel();
          }
          return i;
        } else {
          return -1;
        }
      } else {
        return -1;
      }
    }
    
    ///////////////////mouse drag events
    var componentSelectionIndex;
    
    var dragFlag = false;
    var startDragX;
    var startDragY;
    var dragBaseX;
    var dragBaseY;
    var dragLastX;
    var dragLastY;
    var totalDragDistance;

    var mouseTimeStamp = 0;

    var displayGroupPointer = -1;
    
    //start drag
    canvas.addEventListener("mousedown", function(event) {
      startDrag(event);
    });
    
    function startDrag(e) {
      mouseTimeStamp = Date.now();
      startDragX = globalBaseX;
      startDragY = globalBaseY;
      dragBaseX = e.clientX;
      dragBaseY = e.clientY;
      dragLastX = dragBaseX;
      dragLastY = dragBaseY;
      dragFlag = true;
      totalDragDistance = 0;
      var temp = selectDisplayGroup(dragLastX+globalBaseX, dragLastY+globalBaseY);
      if (temp > -1) {
        displayGroupPointer = temp;
      }
    }

    //end drag
    canvas.addEventListener("mouseup", function(event) {
      endDrag(event);
    });
    
    function endDrag(e) {
      var endTime = Date.now();
      if (((endTime - mouseTimeStamp) < 300) && (totalDragDistance <= 3)) {  //treat as a click event
        componentSelectionIndex = selectComponent(dragLastX+globalBaseX, dragLastY+globalBaseY);
      }
      dragFlag = false;
      displayGroupPointer = -1;
    }
    
    //move while dragging
    canvas.addEventListener("mousemove", function(event) {
      doDrag(event);
    });

    function doDrag(e) {
      if (dragFlag) {
        var currentX = e.clientX;
        var currentY = e.clientY;
        var incrementX = currentX - dragLastX;
        var incrementY = currentY - dragLastY;
        totalDragDistance += Math.abs(incrementX) + Math.abs(incrementX);
        if (totalDragDistance > 3) {
          if (displayGroupPointer > -1) {
            setOfComponents[displayGroupPointer].dataGroup.moveBy(incrementX, incrementY);
            drawModel();
          } else {
            if (incrementX > 0) {
              panLeft(incrementX)
            } else if (incrementX < 0) {
              panRight(-incrementX)
            }
            if (incrementY > 0) {
              panUp(incrementY);
            } else if (incrementY < 0) {
              panDown(-incrementY);
            }
          }
          dragLastX = currentX;
          dragLastY = currentY;
        }
      }    
    }
    
    //mouse leaves canvas
    canvas.addEventListener("mouseleave", function(event) {
      leaveDrag(event);
    });
    
    function leaveDrag(e) {
      if (dragFlag) {
        globalBaseX = startDragX;
        globalBaseY = startDragY;
        if (!running) {
          drawModel();
        }
        dragFlag = false;
      }
    }
    
    ///////////////////touch drag events, for now only supports first touch point
    var touchTimeStamp = 0;

    //start drag
    canvas.addEventListener("touchstart", function(event) {
      startDragT(event);
    });
    
    function startDragT(e) {
      touchTimeStamp = Date.now();
      startDragX = globalBaseX;
      startDragY = globalBaseY;
      e.preventDefault();
      var touches = e.changedTouches;
      dragBaseX = touches[0].pageX;  //change to clientX
      dragBaseY = touches[0].pageY;  //change to clientY
      dragLastX = dragBaseX;
      dragLastY = dragBaseY;
      dragFlag = true;
      totalDragDistance = 0;
      var temp = selectDisplayGroup(dragLastX+globalBaseX, dragLastY+globalBaseY);
      if (temp > -1) {
        displayGroupPointer = temp;
      }
    }

    //end drag
    canvas.addEventListener("touchend", function(event) {
      endDragT(event);
    });
    
    function endDragT(e) {
      var endTime = Date.now();
      if (((endTime - touchTimeStamp) < 300) && (totalDragDistance <= 3)) {  //treat as a click event
        componentSelectionIndex = selectComponent(dragLastX+globalBaseX, dragLastY+globalBaseY);
      }
      dragFlag = false;
      displayGroupPointer = -1;
    }
    
    //move while dragging
    canvas.addEventListener("touchmove", function(event) {
      doDragT(event);
    });
    
    function doDragT(e) {
      if (dragFlag) {
        //e.preventDefault();
        var touches = e.changedTouches;
        var currentX = touches[0].pageX;
        var currentY = touches[0].pageY;
        var incrementX = currentX - dragLastX;
        var incrementY = currentY - dragLastY;
        //accumulate drag distance
        totalDragDistance += Math.abs(incrementX) + Math.abs(incrementX);
        if (totalDragDistance > 3) {
          if (displayGroupPointer > -1) {
            setOfComponents[displayGroupPointer].dataGroup.moveBy(incrementX, incrementY);
            drawModel();
          } else {
            if (incrementX > 0) {
              panLeft(incrementX)
            } else if (incrementX < 0) {
              panRight(-incrementX)
            }
            if (incrementY > 0) {
              panUp(incrementY);
            } else if (incrementY < 0) {
              panDown(-incrementY);
            }
          }
          dragLastX = currentX;
          dragLastY = currentY;
        }
      }    
    }
    
    //touch leaves appropriate area (control works beyond canvas)
    canvas.addEventListener("touchcancel", function(event) {
      leaveDragT(event);
    });
    
    function leaveDragT(e) {
      if (dragFlag) {
        globalBaseX = startDragX;
        globalBaseY = startDragY;
        if (!running) {
          drawModel();
        }
        dragFlag = false;
      }
    }

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var selectedDataGroup;

function selectDisplayGroup(x, y) {

var i = 0;

if (setOfComponents.length > 0) {

var done = false;

while (!done) {

if ((typeof setOfComponents[i].dataGroup !== "undefined") &&

(setOfComponents[i].dataGroup.isVisible()) &&

(setOfComponents[i].dataGroup.isClickInside(x, y))) {

done = true;

} else {

i++;

}

if (i >= setOfComponents.length) {

done = true;

}

if (i < setOfComponents.length) {

return i;

} else {

return -1;

}

} else {

return -1;

}

function selectComponent(x, y) {

var i = 0;

if (setOfComponents.length > 0) {

var done = false;

while (!done) {

if ((typeof setOfComponents[i].graphic !== "undefined") &&

(setOfComponents[i].graphic.isClickInside(x, y))) {

done = true;

} else {

i++;

}

if (i >= setOfComponents.length) {

done = true;

}

if (i < setOfComponents.length) {

if (!setOfComponents[i].graphic.highlighted) {

setOfComponents[i].graphic.highlight();

if (typeof setOfComponents[i].dataGroup !== "undefined") {

setOfComponents[i].dataGroup.turnOn();

}

drawModel();

} else {

setOfComponents[i].graphic.unHighlight();

if (typeof setOfComponents[i].dataGroup !== "undefined") {

setOfComponents[i].dataGroup.turnOff();

}

drawModel();

}

return i;

} else {

return -1;

}

} else {

return -1;

}

///////////////////mouse drag events

var componentSelectionIndex;

var dragFlag = false;

var startDragX;

var startDragY;

var dragBaseX;

var dragBaseY;

var dragLastX;

var dragLastY;

var totalDragDistance;

var mouseTimeStamp = 0;

var displayGroupPointer = -1;

//start drag

canvas.addEventListener("mousedown", function(event) {

startDrag(event);

});

function startDrag(e) {

mouseTimeStamp = Date.now();

startDragX = globalBaseX;

startDragY = globalBaseY;

dragBaseX = e.clientX;

dragBaseY = e.clientY;

dragLastX = dragBaseX;

dragLastY = dragBaseY;

dragFlag = true;

totalDragDistance = 0;

var temp = selectDisplayGroup(dragLastX+globalBaseX, dragLastY+globalBaseY);

if (temp > -1) {

displayGroupPointer = temp;

}

//end drag

canvas.addEventListener("mouseup", function(event) {

endDrag(event);

});

function endDrag(e) {

var endTime = Date.now();

if (((endTime - mouseTimeStamp) < 300) && (totalDragDistance <= 3)) { //treat as a click event

componentSelectionIndex = selectComponent(dragLastX+globalBaseX, dragLastY+globalBaseY);

}

dragFlag = false;

displayGroupPointer = -1;

}

//move while dragging

canvas.addEventListener("mousemove", function(event) {

doDrag(event);

});

function doDrag(e) {

if (dragFlag) {

var currentX = e.clientX;

var currentY = e.clientY;

var incrementX = currentX - dragLastX;

var incrementY = currentY - dragLastY;

totalDragDistance += Math.abs(incrementX) + Math.abs(incrementX);

if (totalDragDistance > 3) {

if (displayGroupPointer > -1) {

setOfComponents[displayGroupPointer].dataGroup.moveBy(incrementX, incrementY);

drawModel();

} else {

if (incrementX > 0) {

panLeft(incrementX)

} else if (incrementX < 0) {

panRight(-incrementX)

}

if (incrementY > 0) {

panUp(incrementY);

} else if (incrementY < 0) {

panDown(-incrementY);

}

dragLastX = currentX;

dragLastY = currentY;

}

//mouse leaves canvas

canvas.addEventListener("mouseleave", function(event) {

leaveDrag(event);

});

function leaveDrag(e) {

if (dragFlag) {

globalBaseX = startDragX;

globalBaseY = startDragY;

if (!running) {

drawModel();

}

dragFlag = false;

}

///////////////////touch drag events, for now only supports first touch point

var touchTimeStamp = 0;

//start drag

canvas.addEventListener("touchstart", function(event) {

startDragT(event);

});

function startDragT(e) {

touchTimeStamp = Date.now();

startDragX = globalBaseX;

startDragY = globalBaseY;

e.preventDefault();

var touches = e.changedTouches;

dragBaseX = touches[0].pageX; //change to clientX

dragBaseY = touches[0].pageY; //change to clientY

dragLastX = dragBaseX;

dragLastY = dragBaseY;

dragFlag = true;

totalDragDistance = 0;

var temp = selectDisplayGroup(dragLastX+globalBaseX, dragLastY+globalBaseY);

if (temp > -1) {

displayGroupPointer = temp;

}

//end drag

canvas.addEventListener("touchend", function(event) {

endDragT(event);

});

function endDragT(e) {

var endTime = Date.now();

if (((endTime - touchTimeStamp) < 300) && (totalDragDistance <= 3)) { //treat as a click event

componentSelectionIndex = selectComponent(dragLastX+globalBaseX, dragLastY+globalBaseY);

}

dragFlag = false;

displayGroupPointer = -1;

}

//move while dragging

canvas.addEventListener("touchmove", function(event) {

doDragT(event);

});

function doDragT(e) {

if (dragFlag) {

//e.preventDefault();

var touches = e.changedTouches;

var currentX = touches[0].pageX;

var currentY = touches[0].pageY;

var incrementX = currentX - dragLastX;

var incrementY = currentY - dragLastY;

//accumulate drag distance

totalDragDistance += Math.abs(incrementX) + Math.abs(incrementX);

if (totalDragDistance > 3) {

if (displayGroupPointer > -1) {

setOfComponents[displayGroupPointer].dataGroup.moveBy(incrementX, incrementY);

drawModel();

} else {

if (incrementX > 0) {

panLeft(incrementX)

} else if (incrementX < 0) {

panRight(-incrementX)

}

if (incrementY > 0) {

panUp(incrementY);

} else if (incrementY < 0) {

panDown(-incrementY);

}

dragLastX = currentX;

dragLastY = currentY;

}

//touch leaves appropriate area (control works beyond canvas)

canvas.addEventListener("touchcancel", function(event) {

leaveDragT(event);

});

function leaveDragT(e) {

if (dragFlag) {

globalBaseX = startDragX;

globalBaseY = startDragY;

if (!running) {

drawModel();

}

dragFlag = false;

}

A Simple Discrete-Event Simulation: Part 88

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