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Use CSS to support fast image rendering on linear axes #5307

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Merged
merged 14 commits into from
Nov 30, 2020
Merged

Use CSS to support fast image rendering on linear axes #5307

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0cf2a7f
add mock for reversed image that uses source
almarklein Nov 27, 2020
fb8d995
Reverse images as needed with css
almarklein Nov 27, 2020
189243f
formatting
almarklein Nov 27, 2020
24c7699
remove jasmine tests that are no longer valid
almarklein Nov 29, 2020
0f0ca1f
Add jasmine test to validate that hover tool shows correct color rega…
almarklein Nov 29, 2020
2470532
Use strTranslate for cleaner code
almarklein Nov 29, 2020
7895727
Bit of suggested code refactoring
almarklein Nov 30, 2020
4d98780
fix test
almarklein Nov 30, 2020
a19b05b
remove mock
almarklein Nov 30, 2020
8ebfa71
improve test code
almarklein Nov 30, 2020
db00dea
also put autorange tests in
almarklein Nov 30, 2020
d4eadbd
correct style
archmoj Nov 30, 2020
e351d9b
simplify transform
almarklein Nov 30, 2020
632532f
fix transform, use linear ranges, fix tests, add mock
archmoj Nov 30, 2020
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23 changes: 14 additions & 9 deletions src/traces/image/plot.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,6 @@ var constants = require('./constants');

var unsupportedBrowsers = Lib.isIOS() || Lib.isSafari() || Lib.isIE();

function compatibleAxis(ax) {
return ax.type === 'linear' &&
// y axis must be reversed but x axis mustn't be
((ax.range[1] > ax.range[0]) === (ax._id.charAt(0) === 'x'));
}

module.exports = function plot(gd, plotinfo, cdimage, imageLayer) {
var xa = plotinfo.xaxis;
var ya = plotinfo.yaxis;
Expand All @@ -31,7 +25,7 @@ module.exports = function plot(gd, plotinfo, cdimage, imageLayer) {
var plotGroup = d3.select(this);
var cd0 = cd[0];
var trace = cd0.trace;
var fastImage = supportsPixelatedImage && !trace._hasZ && trace._hasSource && compatibleAxis(xa) && compatibleAxis(ya);
var fastImage = supportsPixelatedImage && !trace._hasZ && trace._hasSource && xa.type === 'linear' && ya.type === 'linear';
trace._fastImage = fastImage;

var z = cd0.z;
Expand Down Expand Up @@ -144,8 +138,19 @@ module.exports = function plot(gd, plotinfo, cdimage, imageLayer) {
// Pixelated image rendering
// http://phrogz.net/tmp/canvas_image_zoom.html
// https://developer.mozilla.org/en-US/docs/Web/CSS/image-rendering
image3
.attr('style', 'image-rendering: optimizeSpeed; image-rendering: -moz-crisp-edges; image-rendering: -o-crisp-edges; image-rendering: -webkit-optimize-contrast; image-rendering: optimize-contrast; image-rendering: crisp-edges; image-rendering: pixelated;');
var style = 'image-rendering: optimizeSpeed; image-rendering: -moz-crisp-edges; image-rendering: -o-crisp-edges; image-rendering: -webkit-optimize-contrast; image-rendering: optimize-contrast; image-rendering: crisp-edges; image-rendering: pixelated;';
if(fastImage) {
// Flip the SVG image as needed (around the proper center location)
var axisScale = [
(xa.range[0] < xa.range[1]) ? 1 : -1,
(ya.range[0] < ya.range[1]) ? -1 : 1
];
style += 'transform:' +
'translate(50%,50%)' +
'scale(' + axisScale[0] + ',' + axisScale[1] + ')' +
'translate(-50%,-50%)' + ';';
}
image3.attr('style', style);

var p = new Promise(function(resolve) {
if(trace._hasZ) {
Expand Down
54 changes: 51 additions & 3 deletions test/jasmine/tests/image_test.js
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Expand Up @@ -423,9 +423,7 @@ describe('image plot', function() {

[
['yaxis.type', 'log'],
['xaxis.type', 'log'],
['xaxis.range', [50, 0]],
['yaxis.range', [0, 50]]
['xaxis.type', 'log']
].forEach(function(attr) {
it('does not renders pixelated image when the axes are not compatible', function(done) {
var mock = require('@mocks/image_astronaut_source.json');
Expand Down Expand Up @@ -669,5 +667,55 @@ describe('image hover:', function() {
.then(done);
});
});

[
[true, true],
[true, 'reversed'], // the default image layout
['reversed', true],
['reversed', 'reversed']
].forEach(function(test) {
it('should show correct hover info regardless of axis directions ' + test, function(done) {
var mockCopy = Lib.extendDeep({}, mock);
mockCopy.layout.xaxis.autorange = test[0];
mockCopy.layout.yaxis.autorange = test[1];
mockCopy.data[0].colormodel = 'rgba';
mockCopy.data[0].hovertemplate = '%{z}<extra></extra>';
Plotly.newPlot(gd, mockCopy)
.then(function() {_hover(205, 125);})
.then(function() {
assertHoverLabelContent({
nums: '[202, 148, 125, 255]',
name: ''
}, 'variable `z` should be correct!');
})
.catch(failTest)
.then(done);
});
});

[
[[-0.5, 511.5], [-0.5, 511.5]],
[[-0.5, 511.5], [511.5, -0.5]], // the default image layout
[[511.5, -0.5], [-0.5, 511.5]],
[[511.5, -0.5], [511.5, -0.5]]
].forEach(function(test) {
it('should show correct hover info regardless of axis directions ' + test, function(done) {
var mockCopy = Lib.extendDeep({}, mock);
mockCopy.layout.xaxis.range = test[0];
mockCopy.layout.yaxis.range = test[1];
mockCopy.data[0].colormodel = 'rgba';
mockCopy.data[0].hovertemplate = '%{z}<extra></extra>';
Plotly.newPlot(gd, mockCopy)
.then(function() {_hover(205, 125);})
.then(function() {
assertHoverLabelContent({
nums: '[202, 148, 125, 255]',
name: ''
}, 'variable `z` should be correct!');
})
.catch(failTest)
.then(done);
});
});
});
});