Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | import macro from 'vtk.js/Sources/macros';
import { add } from 'vtk.js/Sources/Common/Core/Math';
import { vec3 } from 'gl-matrix';
export default function widgetBehavior(publicAPI, model) {
const state = model.widgetState;
const moveHandle = state.getMoveHandle();
const centerHandle = state.getCenterHandle();
const borderHandle = state.getBorderHandle();
const shapeHandle = state.getSphereHandle();
// Set while moving the center or border handle.
model._isDragging = false;
model.classHierarchy.push('vtkSphereWidgetProp');
moveHandle.setVisible(true);
centerHandle.setVisible(false);
borderHandle.setVisible(false);
shapeHandle.setVisible(true);
function isValidHandle(handle) {
return (
handle === centerHandle ||
handle === borderHandle ||
handle === moveHandle
);
}
function isPlaced() {
return !!centerHandle.getOrigin() && !!borderHandle.getOrigin();
}
// Update the sphereHandle parameters from {center,border}Handle.
function updateSphere() {
const center = centerHandle.getOrigin();
if (!center) return;
centerHandle.setVisible(true);
let border = borderHandle.getOrigin();
if (border) {
borderHandle.setVisible(true);
} else {
border = moveHandle.getOrigin();
if (!border) return;
}
if (isPlaced()) {
moveHandle.setVisible(false);
}
const radius = vec3.distance(center, border);
shapeHandle.setVisible(true);
shapeHandle.setOrigin(center);
shapeHandle.setScale1(radius * 2);
model._interactor.render();
}
function currentWorldCoords(e) {
const manipulator =
model.activeState?.getManipulator?.() ?? model.manipulator;
return manipulator.handleEvent(e, model._apiSpecificRenderWindow);
}
// Update the sphere's center and radius. Example:
// handle.setCenterAndRadius([1,2,3], 10);
publicAPI.setCenterAndRadius = (newCenter, newRadius) => {
const oldCenter = centerHandle.getOrigin();
const oldBorder = borderHandle.getOrigin();
let newBorder = [newCenter[0] + newRadius, newCenter[1], newCenter[2]];
if (oldBorder) {
// Move the boundary handle to reflect the new radius, while preserving
// its direction relative to the center.
const direction = vec3.sub(vec3.create(), oldBorder, oldCenter);
const oldRadius = vec3.length(direction);
if (oldRadius > 1e-10) {
newBorder = vec3.add(
vec3.create(),
newCenter,
vec3.scale(vec3.create(), direction, newRadius / oldRadius)
);
}
}
centerHandle.setOrigin(newCenter);
borderHandle.setOrigin(newBorder);
updateSphere();
model._widgetManager.enablePicking();
};
publicAPI.handleLeftButtonPress = (e) => {
if (!isValidHandle(model.activeState)) {
model.activeState = null;
return macro.VOID;
}
const { worldCoords } = currentWorldCoords(e);
if (model.activeState === moveHandle) {
// Initial sphere placement.
if (!centerHandle.getOrigin()) {
centerHandle.setOrigin(worldCoords);
} else if (!borderHandle.getOrigin()) {
borderHandle.setOrigin(worldCoords);
publicAPI.loseFocus();
}
updateSphere();
return macro.EVENT_ABORT;
}
model._isDragging = true;
model._apiSpecificRenderWindow.setCursor('grabbing');
publicAPI.invokeStartInteractionEvent();
return macro.EVENT_ABORT;
};
publicAPI.handleLeftButtonRelease = (e) => {
if (!model._isDragging) {
model.activeState = null;
return macro.VOID;
}
if (isPlaced()) {
model._widgetManager.enablePicking();
model._apiSpecificRenderWindow.setCursor('pointer');
model._isDragging = false;
model.activeState = null;
state.deactivate();
}
publicAPI.invokeEndInteractionEvent();
return macro.EVENT_ABORT;
};
publicAPI.handleMouseMove = (e) => {
if (!model.activeState) return macro.VOID;
const { worldCoords, worldDelta } = currentWorldCoords(e);
if (model.hasFocus) {
model.activeState.setOrigin(worldCoords);
} else if (model._isDragging) {
model.activeState.setOrigin(
add(model.activeState.getOrigin(), worldDelta, [])
);
}
updateSphere();
return macro.VOID;
};
const superGrabFocus = publicAPI.grabFocus;
publicAPI.grabFocus = () => {
superGrabFocus();
moveHandle.setVisible(true);
centerHandle.setVisible(false);
borderHandle.setVisible(false);
centerHandle.setOrigin(null);
borderHandle.setOrigin(null);
model.activeState = moveHandle;
model._interactor.render();
};
const superLoseFocus = publicAPI.loseFocus;
publicAPI.loseFocus = () => {
superLoseFocus();
model.activeState = null;
};
}
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