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proper radar merge

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This commit is contained in:
Matt Walsh 2020-09-07 22:06:44 -05:00
parent 3ce5e0139f
commit 4b7e314d56
2 changed files with 41 additions and 3575 deletions
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43
server/scripts/modules/radar.js
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@ -127,8 +127,10 @@ class Radar extends WeatherDisplay {
// draw the entire image
if (weatherParameters.State === 'HI') {
workingContext.clearRect(0, 0, 571, 600);
workingContext.drawImage(imgBlob, 0, 0, 571, 600);
} else {
workingContext.clearRect(0, 0, 2550, 1600);
workingContext.drawImage(imgBlob, 0, 0, 2550, 1600);
}
@ -138,8 +140,16 @@ class Radar extends WeatherDisplay {
// get the base map
context.drawImage(await this.baseMap, sourceXY.x, sourceXY.y, offsetX*2, offsetY*2, 0, 0, 640, 367);
// put the radar on top
context.drawImage(workingCanvas, radarSourceX, radarSourceY, (radarOffsetX * 2), (radarOffsetY * 2.33), 0, 0, 640, 367);
// crop the radar image
const cropCanvas = document.createElement('canvas');
cropCanvas.width = 640;
cropCanvas.height = 367;
const cropContext = cropCanvas.getContext('2d');
cropContext.imageSmoothingEnabled = false;
cropContext.drawImage(workingCanvas, radarSourceX, radarSourceY, (radarOffsetX * 2), (radarOffsetY * 2.33), 0, 0, 640, 367);
// merge the radar and map
this.mergeDopplerRadarImage(context, cropContext);
return canvas;
}));
@ -349,4 +359,33 @@ class Radar extends WeatherDisplay {
// rewrite the image
RadarContext.putImageData(RadarImageData, 0, 0);
}
mergeDopplerRadarImage (mapContext, radarContext) {
var mapImageData = mapContext.getImageData(0, 0, mapContext.canvas.width, mapContext.canvas.height);
var radarImageData = radarContext.getImageData(0, 0, radarContext.canvas.width, radarContext.canvas.height);
// examine every pixel,
// change any old rgb to the new-rgb
for (var i = 0; i < radarImageData.data.length; i += 4) {
// i + 0 = red
// i + 1 = green
// i + 2 = blue
// i + 3 = alpha (0 = transparent, 255 = opaque)
// is this pixel the old rgb?
if ((mapImageData.data[i] < 116 && mapImageData.data[i + 1] < 116 && mapImageData.data[i + 2] < 116)) {
// change to your new rgb
// Transparent
radarImageData.data[i] = 0;
radarImageData.data[i + 1] = 0;
radarImageData.data[i + 2] = 0;
radarImageData.data[i + 3] = 0;
}
}
radarContext.putImageData(radarImageData, 0, 0);
mapContext.drawImage(radarContext.canvas, 0, 0);
}
}

3573
server/scripts/twc3.js
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