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BangleApps_old
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Use Graphics.transformVertices and convert rotation to radians

master
Martin Boonk 2022-02-28 20:20:37 +01:00
parent 8f7bd34693
commit dfd127f498
1 changed files with 17 additions and 27 deletions
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36
apps/imageclock/app.js
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@ -252,8 +252,7 @@ function drawElement(pos, offset, path, lastElem){
//print("drawImage from drawElement", image, pos, offset);
var options={};
if (pos.RotationValue){
options.rotate = scaledown(pos.RotationValue, pos.MinRotationValue, pos.MaxRotationValue);
options.rotate = options.rotate * Math.PI* 2;
options.rotate = radians(pos);
}
if (pos.Scale){
options.scale = pos.ScaleValue;
@ -439,23 +438,12 @@ function scaledown(value, min, max){
return scaled;
}
function rotate(center, coords, rotation) {
startPerfLog("rotate");
function radians(rotation){
var value = scaledown(rotation.RotationValue, rotation.MinRotationValue, rotation.MaxRotationValue);
value -= rotation.RotationOffset ? rotation.RotationOffset : 0;
value *= 360;
value -= 180;
//print("Angle", value);
var radians = (Math.PI / 180) * value,
cos = -Math.cos(radians),
sin = Math.sin(radians),
x = (cos * (coords.X - center.X)) + (sin * (coords.Y - center.Y)) + center.X,
y = (cos * (coords.Y - center.Y)) - (sin * (coords.X - center.X)) + center.Y;
endPerfLog("rotate");
return {X:x,Y:y};
value *= Math.PI / 180;
return value;
}
function drawPoly(element, offset){
@ -467,15 +455,17 @@ function drawPoly(element, offset){
startPerfLog("drawPoly_transform");
for (var c of element.Vertices){
vertices.push(c.X);
vertices.push(c.Y);
}
var transform = { x: primitiveOffset.X,
y: primitiveOffset.Y
};
if (element.RotationValue){
var rotated = rotate({X:0,Y:0}, c, element);
vertices.push(rotated.X + primitiveOffset.X);
vertices.push(rotated.Y + primitiveOffset.Y);
} else {
vertices.push(c.X + primitiveOffset.X);
vertices.push(c.Y + primitiveOffset.Y);
}
transform.rotate = radians(element);
}
vertices = g.transformVertices(vertices, transform);
endPerfLog("drawPoly_transform");
if (element.ForegroundColor) g.setColor(element.ForegroundColor);