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Show Frame and Ignore Favicon GET #1

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e2032ff
Update httpcanvas.go
jwatson-CO-edu Jan 19, 2021
3b280bf
Update README.md
jwatson-CO-edu Jan 19, 2021
a38c7d1
Update circle.go
jwatson-CO-edu Jan 19, 2021
e1def67
Update line.go
jwatson-CO-edu Jan 19, 2021
8b1523f
Update lines.go
jwatson-CO-edu Jan 19, 2021
90b42c1
Moved the template HTML to its own file for clarity
jwatson-CO-edu Jan 20, 2021
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -20,3 +20,4 @@ _cgo_export.*
_testmain.go

*.exe
.vscode
2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -33,6 +33,8 @@ func app(context *httpcanvas.Context) {
context.LineWidth(5)
context.StrokeStyle("#003300")
context.Stroke()

context.ShowFrame()
}

func main() {
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2 changes: 2 additions & 0 deletions examples/circle.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,8 @@ func app(context *httpcanvas.Context) {
context.LineWidth(5)
context.StrokeStyle("#003300")
context.Stroke()

context.ShowFrame()
}

func main() {
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2 changes: 2 additions & 0 deletions examples/line.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@ func app(context *httpcanvas.Context) {
context.MoveTo(200, 50)
context.LineTo(50, 200)
context.Stroke()

context.ShowFrame()
}

func main() {
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2 changes: 2 additions & 0 deletions examples/lines.go
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Expand Up @@ -13,6 +13,8 @@ func app(context *httpcanvas.Context) {
context.Stroke()

time.Sleep(1 * time.Second)

context.ShowFrame()
}
}

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164 changes: 8 additions & 156 deletions httpcanvas.go
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Expand Up @@ -8,7 +8,8 @@ import (
"net/http"
"net/url"
"strings"
"strconv"
"strconv"
"io/ioutil"
)

type mouseMovement struct {
Expand Down Expand Up @@ -40,161 +41,12 @@ func (c *Canvas) updateUnique() {
}

func (c *Canvas) renderHtml(w http.ResponseWriter, r *http.Request) error {
container := `<!DOCTYPE HTML>
<!-- http://www.html5canvastutorials.com/tutorials/html5-canvas-lines/ -->
<html>
<head>
<script src="/jquery.js"></script>
<style>
body {
margin: 0px;
padding: 0px;
}
canvas {
border: 1px dashed rgb(170, 170, 170);
position:absolute; top:100px; left:100px;
visibility: hidden;
}
</style>
</head>
<body>
<canvas width="{{.Width}}" height="{{.Height}}"></canvas>
<canvas width="{{.Width}}" height="{{.Height}}"></canvas>
<script>
var currentData = []
var canvases = document.getElementsByTagName('canvas');
var contexts = []
contexts[0] = canvases[0].getContext('2d');
contexts[1] = canvases[1].getContext('2d');
var context = contexts[0]
var bufferIndex = 0

var intervalId = 0

function getMoreCommands() {
if (currentData.length == 0) {
$.ajaxSetup({async: false});
try {
$.get("/command", {id:"{{.Unique}}"}, function(data) {
currentData = data.split("~");
})
.fail(function() {
currentData = ["END"]
});
} catch(e) {
currentData = ["END"]
}
}
}

var nextMouseMoveEvent = 0
function postMouseEvent(cmdName, e) {
if (e.offsetX == undefined) {
x = e.originalEvent.layerX;
y = e.originalEvent.layerY;
} else {
x = e.offsetX;
y = e.offsetY;
}
if (x == undefined || y == undefined) {
return;
}

if (cmdName == "MOUSEMOVE") {
var now = new Date().getTime();
if (now < nextMouseMoveEvent) {
return;
}
nextMouseMoveEvent = now + 30; // throttle to 30ms
}

var cmd = cmdName + " " + x + " " + y
$.ajaxSetup({async: true});
$.post("/command", {id:"{{.Unique}}", cmd:cmd})
}

function parseBool(b) {
return b == "true"
}

function drawFrame() {
getMoreCommands()
while (currentData.length > 0) {
var commandString = currentData.shift()
var command = commandString.split("|");
if (command[0] == "END") {
clearInterval(intervalId)
} else if (command[0] == "CLEARFRAME") {
contexts[bufferIndex].clearRect(
0, 0, canvases[bufferIndex].width,
canvases[bufferIndex].height);
} else if (command[0] == "SHOWFRAME") {
canvases[bufferIndex].style.visibility='visible';
canvases[1-bufferIndex].style.visibility='hidden';
bufferIndex = 1 - bufferIndex
context = contexts[bufferIndex]
break;
} else if (command[0] == "beginPath") {
context.beginPath();
} else if (command[0] == "moveTo") {
context.moveTo(parseFloat(command[1]), parseFloat(command[2]));
} else if (command[0] == "lineTo") {
context.lineTo(parseFloat(command[1]), parseFloat(command[2]));
} else if (command[0] == "stroke") {
context.stroke();
} else if (command[0] == "arc") {
context.arc(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]),
parseFloat(command[5]),
parseBool(command[6]));
} else if (command[0] == "fillStyle") {
context.fillStyle = command[1]
} else if (command[0] == "fill") {
context.fill()
} else if (command[0] == "lineWidth") {
context.lineWidth = parseFloat(command[1])
} else if (command[0] == "strokeStyle") {
context.strokeStyle = command[1]
} else if (command[0] == "fillRect") {
context.fillRect(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]))
} else if (command[0] == "strokeRect") {
context.strokeRect(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]))
} else if (command[0] == "clearRect") {
context.clearRect(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]))
}
}
}

$(canvases[0]).click(function(e) {
postMouseEvent("MOUSECLICK", e);
});
$(canvases[0]).mousemove(function(e) {
postMouseEvent("MOUSEMOVE", e);
});

$(canvases[1]).click(function(e) {
postMouseEvent("MOUSECLICK", e);
});
$(canvases[1]).mousemove(function(e) {
postMouseEvent("MOUSEMOVE", e);
});

intervalId = setInterval("drawFrame()", 30)
</script>
</body>
</html>`
template, err := template.New("basic").Parse(container)
data, err := ioutil.ReadFile("resource/container.html")
container := string( data )
if err != nil {
return err
}
template, err := template.New("basic").Parse(container)
if err != nil {
return err
}
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155 changes: 155 additions & 0 deletions resource/container.html
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@@ -0,0 +1,155 @@
<!DOCTYPE HTML>
<!-- http://www.html5canvastutorials.com/tutorials/html5-canvas-lines/ -->
<html>
<head>
<link rel="icon" href="data:,"> <!-- https://stackoverflow.com/a/38917888 -->
<script src="/jquery.js"></script>
<style>
body {
margin: 0px;
padding: 0px;
}
canvas {
border: 1px dashed rgb(170, 170, 170);
position:absolute; top:100px; left:100px;
visibility: hidden;
}
</style>
</head>
<body>
<canvas width="{{.Width}}" height="{{.Height}}"></canvas>
<canvas width="{{.Width}}" height="{{.Height}}"></canvas>
<script>
var currentData = []
var canvases = document.getElementsByTagName('canvas');
var contexts = []
contexts[0] = canvases[0].getContext('2d');
contexts[1] = canvases[1].getContext('2d');
var context = contexts[0]
var bufferIndex = 0

var intervalId = 0

function getMoreCommands() {
if (currentData.length == 0) {
$.ajaxSetup({async: false});
try {
$.get("/command", {id:"{{.Unique}}"}, function(data) {
currentData = data.split("~");
})
.fail(function() {
currentData = ["END"]
});
} catch(e) {
currentData = ["END"]
}
}
}

var nextMouseMoveEvent = 0
function postMouseEvent(cmdName, e) {
if (e.offsetX == undefined) {
x = e.originalEvent.layerX;
y = e.originalEvent.layerY;
} else {
x = e.offsetX;
y = e.offsetY;
}
if (x == undefined || y == undefined) {
return;
}

if (cmdName == "MOUSEMOVE") {
var now = new Date().getTime();
if (now < nextMouseMoveEvent) {
return;
}
nextMouseMoveEvent = now + 30; // throttle to 30ms
}

var cmd = cmdName + " " + x + " " + y
$.ajaxSetup({async: true});
$.post("/command", {id:"{{.Unique}}", cmd:cmd})
}

function parseBool(b) {
return b == "true"
}

function drawFrame() {
getMoreCommands()
while (currentData.length > 0) {
var commandString = currentData.shift()
var command = commandString.split("|");
if (command[0] == "END") {
clearInterval(intervalId)
} else if (command[0] == "CLEARFRAME") {
contexts[bufferIndex].clearRect(
0, 0, canvases[bufferIndex].width,
canvases[bufferIndex].height);
} else if (command[0] == "SHOWFRAME") {
canvases[bufferIndex].style.visibility='visible';
canvases[1-bufferIndex].style.visibility='hidden';
bufferIndex = 1 - bufferIndex
context = contexts[bufferIndex]
break;
} else if (command[0] == "beginPath") {
context.beginPath();
} else if (command[0] == "moveTo") {
context.moveTo(parseFloat(command[1]), parseFloat(command[2]));
} else if (command[0] == "lineTo") {
context.lineTo(parseFloat(command[1]), parseFloat(command[2]));
} else if (command[0] == "stroke") {
context.stroke();
} else if (command[0] == "arc") {
context.arc(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]),
parseFloat(command[5]),
parseBool(command[6]));
} else if (command[0] == "fillStyle") {
context.fillStyle = command[1]
} else if (command[0] == "fill") {
context.fill()
} else if (command[0] == "lineWidth") {
context.lineWidth = parseFloat(command[1])
} else if (command[0] == "strokeStyle") {
context.strokeStyle = command[1]
} else if (command[0] == "fillRect") {
context.fillRect(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]))
} else if (command[0] == "strokeRect") {
context.strokeRect(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]))
} else if (command[0] == "clearRect") {
context.clearRect(parseFloat(command[1]),
parseFloat(command[2]),
parseFloat(command[3]),
parseFloat(command[4]))
}
}
}

$(canvases[0]).click(function(e) {
postMouseEvent("MOUSECLICK", e);
});
$(canvases[0]).mousemove(function(e) {
postMouseEvent("MOUSEMOVE", e);
});

$(canvases[1]).click(function(e) {
postMouseEvent("MOUSECLICK", e);
});
$(canvases[1]).mousemove(function(e) {
postMouseEvent("MOUSEMOVE", e);
});

intervalId = setInterval("drawFrame()", 30)
</script>
</body>
</html>